Gordon Rajendram the soil scientist

Phillip

Tapping into India’s Thriving Market for Farm Commodities By Leading Expert In Soil Fertility and Science, Hamilton-based Gordon Rajendram

Opinion of Dr Gordon Rajendram New Zealand, renowned for its agricultural practices, has long been a global hub for exporting high-quality farm commodities. Historically, New Zealand has heavily relied on a few key markets for itsagricultural exports, with Australia and China being prominent trade partners. Beijing’s attempts topunish neighbouring Australia through trade for perceived intransigence over issues from the originof COVID-19, to spying and human rights, has been noted in New Zealand. The percentage of NewZealand’s goods exports going to China dropped to 29% in the year to April from 31% in 2022, thefirst time since 2015 that the share of exports to China has dropped. Soil fertility and soil health are critical for farming practices in New Zealand, as they directly impactfarm profitability; however, during the recent recession and inflation in New Zealand, the cost offertilization has risen, underscoring the importance of sustainable farming practices. However, in an ever-evolving global economic landscape, diversifying export markets becomes notjust a strategic choice but a necessity. India, with its burgeoning population and rapidly growingmiddle class, presents a significant opportunity for New Zealand to expand its agricultural exports.This article explores the imperative for New Zealand to diversify its export markets and why Indiastands out as a substantial and promising destination for New Zealand-produced farm commodities. The Need for Market Diversification:Diversifying export markets is a sound economic strategy for any nation. Relying too heavily on asingle market can leave a country vulnerable to economic downturns, trade disputes, or shiftingglobal trends. The reliance on Australia and China as primary export markets has served the countrywell, but it’s crucial to reduce this dependence to ensure long-term economic stability and growth. Economic Resilience: The COVID-19 pandemic demonstrated the fragility of global supply chains andthe importance of having diverse export markets. New Zealand, like many other countries, faceddisruptions in trade during the pandemic, which highlighted the need for a more resilient andadaptable export strategy. Trade Uncertainties: Geopolitical tensions and trade disputes can adversely affect established tradepartnerships. New Zealand must hedge its risks by diversifying its export destinations and reducingdependence on any single market. Capitalizing on Growth: India’s economic growth story is compelling. With a population exceeding1.3 billion people and a rapidly growing middle class, the demand for high-quality food products,including New Zealand’s farm commodities, is on the rise. Capitalizing on India’s economic growthcan be a boon for New Zealand’s agricultural sector. India: A Lucrative Market for New Zealand’s Farm CommoditiesIndia, often referred to as the “world’s largest democracy” and the “fastest-growing majoreconomy,” offers New Zealand an array of opportunities in the realm of agricultural exports. Here’swhy India is an ideal market for New Zealand-produced farm commodities: Growing Middle Class: India’s middle-class population is expanding rapidly, leading to increaseddisposable incomes and changing consumption patterns. This demographic shift is driving demandfor premium and high-quality food products, which New Zealand is well-positioned to supply. Health-Conscious Consumers: Indian consumers are becoming increasingly health-conscious,seeking out organic and sustainably produced foods. New Zealand’s reputation for eco-friendly andresponsible farming practices aligns perfectly with this trend. Dairy Dominance: New Zealand is globally recognized for its dairy products. India’s burgeoning dairyindustry and rising demand for milk and dairy products present significant export opportunities forNew Zealand’s dairy producers. Meat Exports: New Zealand’s meat industry, particularly lamb and beef, is renowned for its highquality. India’s appetite for meat is growing, and New Zealand can tap into this market by supplyingpremium meat products. Trade Relations: Bilateral trade relations between New Zealand and India have been strengthening,with both countries showing a keen interest in expanding their economic ties. This favourablepolitical climate bodes well for increased agricultural trade. ConclusionAs New Zealand seeks to diversify its export markets and reduce reliance on a few key tradingpartners, India emerges as a promising destination for its farm commodities. With a rapidly growingmiddle class, changing consumption patterns, and increasing demand for high-quality agriculturalproducts, India offers a substantial opportunity for New Zealand to expand its agricultural exportsand secure long-term economic growth. By strategically tapping into the Indian market andaddressing challenges through careful planning and partnerships, New Zealand can solidify itsposition as a global leader in agricultural exports. Contact Gordon Rajendram 021 466 077 rajendram@xtra.co.nz www.gordonrajendramsoilscientist.co.nz Contact Phillip QuayPhone: 0274 587 724Email: phillip@mediapa.co.nzWebsite: https://mediapa.co.nz/

Tapping into India’s Thriving Market for Farm Commodities By Leading Expert In Soil Fertility and Science, Hamilton-based Gordon Rajendram Read More »

Eminent Soil Scientist Dr. Gordon Rajendram, Hamilton, DiscussesUnprecedented Rainfall, its effects, and how to mitigate it.

Rain, rain, and more rain.In several areas of New Zealand, the yearly rainfall limit has already been exceeded in under six months. Take, for example, the numerous landslides that have occurred, especially in areas prone to erosion, like the hill country in Gisborne, due to the saturation of soils. Ironically, water is the most limiting factor for pasture or crop growth. So are your soil nutrients and farm profits being washed away? Yes, very possibly! Phosphorous loss comes at a considerable cost to farmers and the environment. If the soil has sufficient moisture for leaching, water may carry nutrients away during drainage and disappear below the root zone.Nutrients loosely bound to clay particles or organic matter in the soil are more likely to be washed away through leaching or runoff.The appropriate nitrogen level for a crop is affected by several factors, including its utilisation efficiency. Various elements, such as weather conditions during application, the crop’s wellness and root system, the type of product utilised, and the availability of other nutrients, all have an impact. How can you mitigate the amount of rainfall and its effects? Despite the excessive leaching due to heavy rainfall this year, the forecast indicates that the upcoming season will be comparatively drier. – Welcome news within the agricultural sector. As the upcoming elections approach, there is a hopeful anticipation that the farming industry will receive much-needed relief from the severe impacts of climate change and policy reforms. Farmers need to grow, thrive, and succeed in the industry they are experts in – farming. Dr Gordon Rajendram is a New Zealand Independent Soil Scientist specialising in Soil Fertility,Agronomy & Farm Environmental Consultancy. Gordon Rajendram9 Kakanui Avenue, Hillcrest, Hamilton 3216P: 021 466 077E: rajendram@xtra.co.nzWeb site: http://dev.gordonrajendramsoilscientist.co.nz‘ Bringing science to the farm.’ Phillip Quayphillip@mediapa.co.nzP: 0274 587 724www.mediapa.co.nzfacebook.com/mediapa

Eminent Soil Scientist Dr. Gordon Rajendram, Hamilton, DiscussesUnprecedented Rainfall, its effects, and how to mitigate it. Read More »

New Zealand’s Independent Leading Expert In Soil Fertility, Hamilton-Based Gordon Rajendram, Discusses Sustainability

Futureproofing for SustainabilityThe practice of agriculture meets the needs of present and future generations in textiles andsociety’s food without compromising the ability of current or future generations to meettheir needs.Agriculture is important in our environmental footprint, as it contributes to causing climatechange, water scarcity and pollution, land degradation, and deforestation. I. One way to improve agricultural and food production practices is byincorporating biological and ecological processes such as nutrient cycling, soilregeneration, and nitrogen fixation.II. We can help the environment by using fewer non-renewable andunsustainable resources, especially those that are harmful to theenvironment.III. Farmers’ expertise can be utilised for efficient farming practices and forpromoting self-reliance and self-sufficiency.IV. The cooperation and collaboration of individuals with diverse skills areutilised to address agricultural and natural resource challenges. Thesechallenges encompass pest management and irrigation issues. Sustainability in agriculture must incorporate the following principles: o Providing nutrient-rich food for farmers, farm families, and communitieshelps to maintain good public healtho Farming operations must be profitable, or they risk going out of business. Sustainability requires three key principles:I. It is important to ensure that the fertiliser used remains in the soil and does not getwashed away below the root zone or runoff.Significant this last season as it rained from Nov 2022 through summer, autumn, and winter2023. A significant amount of nutrients, specifically nitrate-N, and sulphate, will be lost through leaching (measured in kg/ha).Applying soluble phosphate to low ASC soils is more likely to runoff or leach – therefore, it isbest to apply a small component of the quick release and the majority as slow release N, P & S fertilisers.  II. Pasture growth costs are relatively low in New Zealand, and farmers excel at themdue to the lack of subsidies, unlike other countries. The price ranges from 1 cent perkilogram of dry matter for sheep and beef to about 6 cents per kilogram of drymatter for dairy. For the system to be sustainable, it is important to grow and convert forage into meat ormilk (protein) at a lower cost to increase efficiency and promotes sustainability. III. Consider incorporating legumes like clover to enhance feed quality and fix nitrogen.Other useful herbs include plantain, chicory, and deep-rooting forages that canabsorb leached nutrients that traditional ryegrass and clover pastures might not.These herbs also have a unique ability to absorb trace elements, which differs fromrye and clover pastures. Farming practices must be ecologically sound, promote healthy biodiversity, and sensiblemanagement of natural resources in order to promote sustainability. Dr Gordon Rajendram is a New Zealand Independent Soil Scientist specialising in Soil Fertility,Agronomy & Farm Environmental Consultancy. Gordon Rajendram9 Kakanui Avenue, Hillcrest, Hamilton 3216P: 021 466 077E: rajendram@xtra.co.nzWeb site: http://dev.gordonrajendramsoilscientist.co.nz‘ Bringing science to the farm.’ Phillip Quayphillip@mediapa.co.nzP: 0274 587 724www.mediapa.co.nzfacebook.com/mediapa

New Zealand’s Independent Leading Expert In Soil Fertility, Hamilton-Based Gordon Rajendram, Discusses Sustainability Read More »

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New Zealand’s Independent Leading Expert In Soil Fertility, Hamilton-Based GordonRajendram, Discusses Reducing Agriculture Emissions Through Improved FarmingPractices

In Aotearoa, New Zealand, half of the gross emissions come from agriculture, which includesthe majority of nitrous oxide and biogenic methane emissions. Agriculture is a significant emitter, but reducing emissions will build the sector’s resilience.To meet our 2050 target, it is crucial to decrease these emissions, specifically biogenicmethane emissions, by 24-47% by 2050.One central approach to reducing emissions is through changes in significant polluters suchas the Tiwai smelter. This could involve transitioning from coal power to a different form ofgas.The second approach is to release water vapour from the exhaust of hydrogen-powered carsrather than a carbon molecule.The 3 rd approach is to reduce carbon (methane, NO 2 and CO 2 ) from agriculture. “As a scientist, I know we must do all these to reduce carbon emissions for asustainable future”. Farmers, scientists, and entrepreneurs in New Zealand are skilled at finding innovativesolutions. Vaccinees are being worked on and testing trials are being conducted.For example, they have discovered a way to reduce methane emissions by feeding cows acertain type of seaweed (as much as 90% reduction) or biochar (15% methane reduction),which also helps to bind nitrogen and reduce NO 2 emission from cow dung and preventnitrate leaching once the biochar gets to 10% of the soil volume. “New Zealand signed up to the Paris Protocol – so we are heading in this directionwhether we agree or disagree”. Livestock accounts for about 75% of agricultural emissions, primarily from biogenic methane.Nitrous oxide from nitrogen fertiliser use accounts for about 3.9% of agricultural emissions.Additionally, we have set separate targets for reducing biogenic methane emissions.Specifically, we aim to decrease biogenic methane emissions by 10 per cent by 2030compared to 2017 levels and by 24 to 47 per cent by 2050.The agricultural industry significantly impacts the environment, accounting for a growingportion of global greenhouse gas emissions. Therefore, the sector must take action to limit the effectsof climate change.There are various ways to decrease nitrous oxide emissions, such as: Reducing production intensity, even by a small amount, can positively impact theenvironment while maintaining profitability. In addition, farmers can offset their greenhousegas emissions by planting trees.Studies have shown that optimising food production by altering farming methods is vital todecreasing emissions from agriculture. By utilising a range of established technologies andpractices currently in use, we could achieve up to 20% of the necessary emissions reductionfor the sector by 2050. Steps to reduce emissions How can we improve the efficiency of pasture and crop production? Reducing nitrogen loss and emissions are firmly connected. The focus is on lowering N-surplus, decreasing imported/harvested feed and reducing methane.Some tips for reducing N-surplus: An effective way to reduce methane emissions is by regulating the feed given. Studiesindicate that there is a connection between methane production and feed consumption. This implies that the more feed given per hectare, the higher the methane emissions will be. Research shows there is a direct link between feed intake and methane produced. For everyadditional kg of total feed eaten per hectare, total methane emissions increaseproportionally. “Feeding Biochar to Cows is an Innovative Solution for Improving Soil Fertility andFarm Productivity”. One of the issues of cattle farming is the urine patch, and high fertility, i.e. the loss ofnutrients in the ground.“If you feed animals with carbon supplement such as biochar, you can reduce methane by15 per cent and nitrous oxide by 50 per cent and reduce nitrate leaching”.To conclude; by the start of 2025 ALL NZ farms must have a written plan to measure andmanage their emissions aligning with the Climate Change Response (Zero Carbon) Act. Dr Gordon Rajendram is a New Zealand Independent Soil Scientist specialising in Soil Fertility, Agronomy & Farm Environmental Consultancy. Gordon Rajendram9 Kakanui Avenue, Hillcrest, Hamilton 3216P: 021 466 077E: rajendram@xtra.co.nzWeb site: http://dev.gordonrajendramsoilscientist.co.nz‘ Bringing science to the farm.’ Phillip Quayphillip@mediapa.co.nzP: 0274 587 724www.mediapa.co.nzfacebook.com/mediapa

New Zealand’s Independent Leading Expert In Soil Fertility, Hamilton-Based GordonRajendram, Discusses Reducing Agriculture Emissions Through Improved FarmingPractices Read More »

New Zealand’s Independent Leading Expert In Soil Fertility, Hamilton-Based Gordon Rajendram, Discusses Soil Health and Its Importance In Farm Profitability.

A recession is looming closer and taking farmers’ profits with it. In addition, farmers continually face rising costs, inflationary pressures, regulatory obligations and increasing demands for sustainably produced food –  the inflation genie is out of the bottle, and it could be challenging to get it back in. As a result, farmers are tightening the purse strings; however, maintaining good soil health during a recession will increase a farm’s long-term profitability. New Zealand’s farming practices have long depended on grass and livestock that eat grass. It has been the economic backbone of the agricultural industry pre the European settlement era and a well-established reputation for being the best at converting pasture to protein as milk and meat. However, there are still areas for improvement in this process. Studies have shown that New Zealand farmers have the smallest carbon footprint when producing milk and meat compared to other countries. During a recession, it’s crucial to comprehend the significance of soil health. A farm’s profitability begins in the soil; therefore, ensuring a farm’s profitability must start with prioritising the soil quality. Farmers benefit from regular soil testing and monitoring to better understand soil conditions. There are sixteen essential elements required for optimal pasture and animal health. However, it’s possible to spend unnecessary money on factors that are not needed. Factors to consider: Phosphate is a key element for plant growth. Any phosphate applied needs to stay in the soil and not runoff as particulate P or leach into subsoils. Much of the loss is related to the soil type, climate, Anion storage capacity, and overuse of soluble forms of P. Mitigating P losses: Proper fertilisation is crucial for enhancing water quality and maximising nutrient use efficiency. On the other hand, incorrect application of fertilisers can harm the quality of grass and crops and eventually animals, resulting in decreased profitability, emphasising the importance of obtaining the correct independent soil advice. Maintenance fertiliser refers to the nutrients needed to balance the nutrients removed from the farm through meat, wool, milk, crops, and silage with the nutrients remaining in the soil. Several factors, including soil type, topography, stocking rate, future land use, crops, and rainfall, impact the requirements for maintenance fertiliser. Different farming operations and production areas on a farm have varying maintenance requirements. Nonetheless, when applying fertiliser, it is vital to aim for soil fertility levels no higher than the recommended nutrient range for optimum plant growth, known as agronomic optimum. In autumn, it is crucial to understand how specific nutrients react in the soil to reduce the risk of nutrient loss. For example, when applying phosphate, avoid high-risk months (April-October),and defer application if rainfall is likely to cause runoff within seven days. When testing the soil it is imperative to avoid dung and urine hotspot patches that can skew readings because of high nutrient levels. Animals excrete 66% of what they eat. The soil can yield lush and nourishing pasture by ensuring a proper equilibrium, resulting in happy animals and contented farmers. Dr Gordon Rajendram is a New Zealand Independent Soil Scientist specialising in Soil Fertility, Agronomy & Farm Environmental Consultancy. Gordon Rajendram 9 Kakanui Avenue, Hillcrest, Hamilton 3216 P: 021 466 077 E: rajendram@xtra.co.nz Web site: http://dev.gordonrajendramsoilscientist.co.nz ‘ Bringing science to the farm.’ Phillip Quay phillip@mediapa.co.nz P: 0274 587 724 www.mediapa.co.nz facebook.com/mediapa

New Zealand’s Independent Leading Expert In Soil Fertility, Hamilton-Based Gordon Rajendram, Discusses Soil Health and Its Importance In Farm Profitability. Read More »

New Zealand’s leading expert in soil fertility, Hamilton-based Soil Scientist Gordon Rajendram (PhD) looks at ways of increasing a farm’s profitability in times of recession

The most economical forage for animals is good nutritious pasture which includes good energy, protein that is digestible and has fibre in it. The cost to produce pasture can cost between 2 – 6 cents per kilo of dry matter. In order to achieve the above, you need to have adequate nutrients in the soil. Farm’s profitability starts in the soil and getting this right will, without doubt, lead to great pasture and better soil health, i.e., it is aerated, it holds onto the nutrients, whatever is applied doesn’t leach and the right forage types. Having a variety of species of forage is beneficial i.e., grass, clover, herbs etc. The importance of independent soil management and fertiliser advice is crucial rather than just someone trying to sell a product. There appears to be major conflicts of interest in this area. Large savings can be made if the advice is correct. The 16 elements are required for pasture and animal health. In some cases, excess money is spent on elements that are not necessary and hence the importance of independent advice. Soil management is an expert area and one which can lead to better profits. Sampling is one of the crucial aspects of soil management. Soil is important at the start and pastures grown on this are essential for farm profitability.  New Zealand is the best at converting pasture to milk and protein (meat) but there are still ways this can be improved. New Zealand farmers have the lowest carbon footprint to produce meat and milk Published research shows that NZ farmer’s carbon footprint to produce meat and milk is the lowest compared to other countries. In the dairy sector, the emissions to produce 1 litre of milk have been estimated to be 0.9 kg CO2 when compared to the global average of 2.4 kg CO2 per litre of milk. In the NZ dairy sector, PKE was the main supplementary feed type used on farms. PKE though has the highest carbon footprint of any brought-in supplementary feeds. NZ’s carbon footprint to produce beef is one of the lowest with ~9 kgCO2e/kg LW and NZ’s carbon footprint to produce sheep is the lowest at ~6 kgCO2e/kg LW.  This is due to the NZ lower cost pasture grazed-based systems. Compare this to say in many parts of the world where pasture or crops are cut and carried and fed in a shed system. Studies have shown for humans to have a balanced diet a component of milk and meat is required. A lot is going on below the ground (leaching) so this has to be prevented and lead to greater profits. Accurate testing is essential to ensure more efficient ways of nutrient uptake. There must be nothing limiting this process in the soil. Whatever is applied you must make sure the soil can hold onto this and that it is not leached. Having a whole lot of fertiliser on top is only part of the process. Having knowledge of what is going on underneath the ground is critical to profitability. Contact Gordon: Email: rajendram@xtra.co.nz Facebook: https://www.facebook.com/Gordon-Rajendram-Soil-Scientist-830978353759572/ Contact MediaPA: Phone: 0274 587 724 Email: phillip@mediapa.co.nz Website: www.mediapa.co.nz Facebook: www.facebook.com/MediaPA Twitter: twitter.com/NZ_MediaPA YouTube: www.youtube.com/user/TheMediaPA Pinterest: www.pinterest.com/NZMediaPA

New Zealand’s leading expert in soil fertility, Hamilton-based Soil Scientist Gordon Rajendram (PhD) looks at ways of increasing a farm’s profitability in times of recession Read More »

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Hamilton-based Soil Scientist Gordon Rajendram recently visited An efficient dairy farming system – Ngatimaru Farms – and these are his findings.

The farm and production: I consult to dairy farmers Rick and Dianna Bourke whose farm is inEiffelton, 15 minutes away from Ashburton. The farm is approximately 10 km from the Canterbury East Coast.They have a Jersey herd of 740 cows, with cow weights on average being 425 kg. The cows dietconsists mainly of pasture with in shed feed of 2 kg of a blend/cow/day and the farm is irrigated.The average farm milk production over the past three years has been 350,000 MS/year with theaverage cow production being 480 MS/cow. If you don’t test you cannot manage: The farm was comprehensively soil tested (called soilbenchmarking a farm) to determine the nutrient and soil pH status of the farms in winter of 2020when cows were wintered off. Tests included anion storage capacity (ASC), cation storage capacity (CEC), Olsen P, resin P, Sulphate-S; exchangeable calcium, magnesium, potassium and sodium; TP, TS, TN, TC, organic matter, and trace elements boron, copper, zinc, cobalt, selenium and molybdenum.Through a comprehensive testing and data analysis, paddocks were identified that were belowoptimum, at optimum or above optimum for each nutrient. From this nutrient density maps were created for each nutrient or soil parameter. The results from the testing showed that the soil on the farm had low Phosphate retention (ASC) and Sulphur retention ability.Pasture and clover only was determined for its nutrient content in spring and autumn when the pasture is actively growing. Pasture growth rates and pasture covers on the farm are measured weekly by GrassCo. Minimal N and Fertiliser use:The nitrogen applied on the farm over the last 3 years has been on average 74 kg N/ha/year, applied via foliar spray using a 6200 L AMAZONE spray unit. Other elements and trace elements that can be solubilised are applied with the foliar nitrogen as required based on soil and pasture testing. Lime was applied to achieve a soil pH of ~ 6.4Phosphate applied to paddocks as RPR or Di-calcic if Olsen P <20 and P withheld if Olsen P >30.Sulphur applied at 30 kg/ha using elemental S to all paddocks.The soils were very compacted. One of the reasons for the compacted soils is because of thenaturally high magnesium levels. To help fix the compaction issue and aerate the soil, theAgraforum soil conditioning program was used. Forage with multi species:Multi species (~ 9 – 11 species) was grown on a few paddocks and compared to rye grass/cloverpaddocks. A root enhancing product was applied to improve root growth. Outcomes from the visit as summarised:Duncan Barr, is measuring the grass growth using GrassCo technology on the farm, commented: “It is very noticeable how good, even and dense the pasture growth is compared to other farms”. “It’s as if they are using 300 kg/ha/year of nitrogen when they are actually using much less”.This farm has low, but efficient use of fertiliser and nitrogen to produce quality pasture, and consequently the cost to produce milk is very low.Cows produce extra 1 Litre of Milk when cows graze on multi species paddock compared to when grazed on just ryegrass clover paddocks.This is an extra 0.1 kg of milk per cow which equates to ~$0.90/cow/day. So, for the 740-cow herd it is an extra income of ~$660 per day when the multi species is grazed. The plan now is to put more paddocks into multi species.

Hamilton-based Soil Scientist Gordon Rajendram recently visited An efficient dairy farming system – Ngatimaru Farms – and these are his findings. Read More »

Improve the quality of your soil

Soil testing and soil sampling is critical to improving the quality and mineral balance ofyour soil.The vital point of soil testing is to determine if there are sufficient levels of the essentialelements for plants and livestock to grow at their best.All physical things in the universe are made from 92 naturally occurring chemicalelements. Living things such as plants and animals are mostly made of certain elements,depending on the life form. These are known as the essential elements of life, meaningthat if all the other elements are present, but if one of these elements is missing, thenthe organism will fail.There are 13 elements were needed for plant and animal growth, not just nitrogen (N),phosphorus (P) and potassium (K). A further three elements (cobalt, selenium andiodine) are essential animal health and nutrition. If your soil is deficient in one or morenutrients, your livestock and plants are not going to be able to receive enough of thosenutrients to grow properly.If farmers are injection or bulleting animals for any deficient nutrients such as Cobalt,Selenium , Iodine or any nutrient it is a soil borne disorder. Injecting, bulleting orsupplementing nutrients to animals overcomes the problem short term rather than fixingthe cause, which is a soil borne disorder. Its equivalent to taking medication rather thanfixing the root cause. Testing of soil, pasture, clover only or animal bloods is relatively cheap. Coming in atless than 1% of your total fertiliser costs, it is a cost-effective investment in the healthand wellbeing of your plants and livestock.When it comes to your livestock, if the pasture they are eating does not contain correctamounts of the right nutrients they will not grow in a healthy manner, or worse, becomesick.Most dairy farms probably need only about 13kg/ha of P per year to maintain theirphosphate levels, but more than 70kg/ha is sometimes applied, leading to massiveexpenditure. This money could be diverted to overcome any deficient nutrient.Accurate soil testing also provides a significant management tool in creating an efficientsoil fertility programme, as well as watching out for potential soil issues.

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Hamilton Based Independent Soil Scientist Dr Gordon Rajendram (PhD), Discusses Healthy Soils In New Zealand.

Healthy soil and pasture production rely upon the correct soil testing process. Let’s take a look at two key factors that drive pasture production. The first key factor is soil temperature at 10cm. At 5 or 6 degrees, the pasture stops growing. The second key factor is soil moisture and the significant impact on pasture production with soil moisture < 25%. A Field Collaborated Soil Test at this stage will help you find the maximum pasture production between low productivity and wasting money. At this point, I would like to highlight that pasture species do not thrive in low-pH soils in addition to the two critical factors named above. Why is this? In simple terms, it is due to the increased Aluminium in the soil solution, which retards root growth – the implication leading to less growth of herbage on top. Currently, many soils are very acidic (<5.5pH). Farmers could alleviate this problem by applying lime to eliminate soil acidity. However, with the proper testing and planning, every budget has room to include lime and fertiliser as part of pasture management programmes. You may have heard in the news recently about the impact Leaching is having on our soils.  Leaching is the loss of water-soluble plant nutrients from soils. Factors such as rain and irrigation are contributing factors. The result – amounts of nutrients are lost via sub-service flow related to the amount of rainfall and drainage.  We see the knock-on effect with essential nutrients in plants. These exist as anions and cations – the leaching of anions and cations is conditional on various factors including, but not limited to, the amounts and form of nutrients applied in fertiliser, stocking rates, drainage, soil types and the previous extent of soil leaching. Plant growth is dependent on a critical element – Phosphate. Applied phosphate must remain in the soil and not run off as particulate P or leach into subsoils.  So how can we mitigate P losses? . I want to emphasise two critical factors. I cannot stress enough the importance of this information when factoring in using phosphorus and sulphur fertilisers. Secondly, it is essential to remember that fertiliser is only one aspect of a productive management system. If you don’t test properly, you are doing yourself a disservice to your business. As an Independent Fertiliser Consultant, I am dedicated to helping all farmers get the most out of their soils so their farm, their most significant asset, works more efficiently and sustainably for increased profitability. “To forget how to dig the earth and to tend the soil is to forget ourselves.” -Mahatma Gandhi. Dr Gordon Rajendram is a New Zealand Independent Soil Scientist specialising in Soil Fertility, Agronomy & Farm Environmental Consultancy.

Hamilton Based Independent Soil Scientist Dr Gordon Rajendram (PhD), Discusses Healthy Soils In New Zealand. Read More »

Fertilizer or Lime?

With the high fertiliser prices this year it will be prudent to soil test, in particular to measure soil pH, and correct deficiencies by liming as lime prices have stayed relatively similar to last year. A lot of farms in New Zealand’s Hill Country have low soil pH levels. Dairy pastures that do not perform are usually associated with low soil pH.  As it stands, there has been more emphasis on fertiliser at the expense of liming. However, both can be achieved within the farmer’s budget. Pasture species do not like low pH soils as there is increased Aluminium in the soil solution which retards root growth, which in turn leads to less growth of herbage on top. Soil pH levels below 5.5 tend to have soil solution Aluminium levels >3.0 mg/kg, ideally you want the aluminium levels < 0.1 mg/kg. One of the cheapest ways to alleviate this issue is liming.   There is scientific evidence to show that as soil pH increases up to ~soil pH 6.5 there is an increase in microbial activity.  Microbial activity plays a major role in nutrient cycling in the soil.  You may have 3 (500 kg) cattle running on top of your dirt, but you have about the equivalent (in weight) of 25 cattle or 250 sheep, in underground fauna, running below ground. MAF’s recommendation is for soil pH to be between 5.8 and 6.0 based on the dry matter production.  The ideal pH is around 6.2 – 6.4 if you consider quality of feed, more clover growth, greater earth worms (which aerate the soil), more calcium in the diet, and phosphate less tightly held by the soil. Because of the cost of flying lime on Hill Country, a lot of farmers are put off from trying it. Lime is normally $30 -$35 per tonne, cartage is typically ~$20 – 40 per tonne (depending on how far the farm is from the lime pit), but flying is ~$120/tonne.  There is not enough in the farmers’ budget when a normal Hill Country farm fertiliser and lime budget is ~$120 -$150 /hectare/per year. However, there are solutions to address this price issue. Normally it takes 1 tonne of lime to lift soil pH by 0.1 unit, but much depends on the Cation exchange capacity (CEC) of the soil. A low CEC soil, such as a sandy soil, requires much less lime to lift pH by 0.1 unit. With the greater rainfall this spring there will be greater leaching occurring and soil nitrates that leach below the root zone will take a positive ion such as calcium with it.  Generally, ~150 kg/ha/yr of Calcium is leached if no nitrogen is applied as fertiliser but increases as more nitrogen fertiliser is applied. The problem with New Zealand farms is that farmers are not applying lime because of the above, so many soils are getting very acidic (< 5.5 pH), with soils getting down to as low as 5.0 pH.  This has a significant detrimental impact on pasture production and clover growth, which ultimately leads to substandard animal performance. The solution lies in having proper soil and pasture testing as without testing you cannot know what minerals need to be added to your soil and in what amounts. Otherwise, it becomes a guessing game.  Expert advice is needed at the right time, with a plan to address the issue within the budget allocated. If these steps are taken, there is enough in the farmers’ budget to both lime and fertilise in order to reduce soil acidification. 

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