Soil is not just a passive environment where plants grow, but a dynamic, living system that plays a critical role in agricultural success. While it is often perceived as a vast reservoir of water, nutrients, microbes, and organic matter, assuming that plants will simply draw from these resources as needed, this viewpoint oversimplifies the true complexity of soil-plant interaction. For farmers seeking to optimise crop yields and soil efficiency, it is vital to grasp the fundamental processes that govern the relationship between soil properties, root systems, and nutrient availability. By deepening our understanding of these factors, we can unlock the full potential of our land, improve plant health, and maximise the return on agricultural investments.

The Importance of Soil Chemistry in Plant Growth

At the core of soil and plant interaction lies soil chemistry. The ability of soil to supply essential nutrients, facilitate water movement, and support microbial life directly influences plant growth and productivity. Understanding the chemical properties of soil, such as pH, cation exchange capacity (CEC), and organic matter content, allows farmers to make informed decisions regarding fertiliser application and soil management.

Soil pH, for instance, significantly impacts nutrient availability. In highly acidic or alkaline soils, certain nutrients become less available to plants, resulting in poor growth. By adjusting soil pH through the application of lime or sulphur, farmers can ensure that nutrients are in their most bioavailable form, enabling crops to take up nutrients more efficiently. Cation exchange capacity is another key factor, as it reflects the soil’s ability to hold and exchange nutrients. Soils with high CEC have a greater capacity to retain essential cations such as potassium, magnesium, and calcium, reducing nutrient leaching and improving plant uptake.

Soil Structure and Its Impact on Root Development

Soil structure—the arrangement of soil particles into aggregates—also plays a crucial role in plant growth. Well-structured soils have good aeration, water-holding capacity, and root penetration, allowing roots to explore a larger volume of soil and access more nutrients. Compacted soils, on the other hand, restrict root growth, reduce water infiltration, and limit oxygen availability, all of which negatively affect plant health.

Farmers can improve soil structure by incorporating organic matter, such as compost or cover crops, into their fields. Organic matter acts as a binding agent, promoting the formation of stable soil aggregates. Additionally, no-till or reduced-till farming practices can help maintain soil structure by minimising soil disturbance and promoting the activity of soil organisms like earthworms, which play a key role in creating channels for water and air movement.

Nutrient Uptake Mechanisms: How Plants Absorb Essential Elements

To understand how plants interact with soil, it is essential to explore the mechanisms by which they absorb nutrients. Nutrient uptake is not a passive process; rather, it involves a combination of root growth, soil properties, and chemical interactions. There are three primary mechanisms through which plants acquire nutrients: interception, mass flow, and diffusion.

1. Interception: Direct Root Contact with Nutrients

Interception occurs when plant roots physically encounter nutrients as they grow through the soil. Although this mechanism only accounts for a small percentage of nutrient uptake—approximately 1% for maize—it plays a role in absorbing nutrients such as phosphorus, potassium, and zinc. The efficiency of interception depends on root density, soil structure, and the availability of nutrients in the soil. In well-structured soils with an abundance of organic matter, root growth is more extensive, increasing the chances of direct contact with essential nutrients.

2. Mass Flow: Nutrients Carried by Water

Mass flow is the movement of nutrients dissolved in soil water towards the roots as plants take up water. This mechanism is particularly important for the uptake of nutrients that are mobile in the soil, such as nitrogen (in the form of nitrate), calcium, and sulphur. In environments with adequate rainfall or irrigation, mass flow is a dominant mechanism for nutrient uptake. However, in dry conditions, the effectiveness of mass flow decreases, making it important for farmers to monitor soil moisture levels and adjust irrigation practices accordingly.

3. Diffusion: Movement of Nutrients from High to Low Concentration

Diffusion is the movement of nutrients from areas of higher concentration to areas of lower concentration, driven by a concentration gradient. This mechanism is particularly important for nutrients like phosphorus, potassium, and zinc, which are less mobile in the soil. These nutrients are often bound to soil particles and need to diffuse through the soil solution to reach plant roots. Farmers can improve diffusion by placing fertilisers close to the root zone, ensuring that nutrients are within reach of the growing roots.

The Role of the Rhizosphere in Nutrient Availability

The rhizosphere—the narrow region of soil surrounding plant roots—is a hotspot of biological activity and plays a critical role in nutrient availability. Root exudates, which include sugars, amino acids, and organic acids, are released into the rhizosphere and influence nutrient availability in several ways.

Root Exudates and Microbial Interactions

Root exudates feed soil microbes, which, in turn, play a vital role in nutrient cycling. For example, bacteria in the rhizosphere can convert organic forms of nitrogen into plant-available forms like ammonium and nitrate. Similarly, mycorrhizal fungi form symbiotic relationships with plant roots, extending their hyphae into the soil to access nutrients like phosphorus that would otherwise be out of reach.

Chelation and Nutrient Solubility

Certain root exudates, particularly organic acids, can chelate (bind) metal ions like zinc, iron, manganese, and copper, making them more soluble and available for plant uptake. This process is especially important in soils with high pH, where these micronutrients may be present but not in a form that plants can easily absorb. Chelation improves the bioavailability of these essential nutrients, promoting healthier plant growth and development.

pH Modification in the Rhizosphere

Plants can actively modify the pH of their rhizosphere by releasing hydrogen ions (H+) or bicarbonates (HCO3-), depending on the nutrient needs and soil conditions. For example, in response to low phosphorus availability, plant roots may release organic acids that lower the rhizosphere pH, increasing the solubility of phosphorus and making it easier for plants to absorb. By understanding how plants interact with their rhizosphere, farmers can tailor their fertilisation practices to ensure that nutrients are available in the right form and at the right time.

Precision Fertilisation: Maximising Efficiency and Minimising Waste

Precision fertilisation is a key component of modern farming practices that aims to apply the right amount of nutrients at the right time and place. By understanding the mechanisms of nutrient uptake and the role of the rhizosphere, farmers can make informed decisions about fertiliser application, ensuring that nutrients are used efficiently and sustainably.

For example, nutrients that rely on diffusion, such as phosphorus and potassium, are most effective when placed near the root zone at planting. In contrast, nutrients that are mobile in the soil, like nitrogen and sulphur, can be broadcast or applied through fertigation. Tailoring fertilisation strategies to the specific needs of the crop and soil conditions not only improves nutrient use efficiency but also reduces the risk of nutrient runoff and environmental pollution.

Conclusion: Enhancing Crop Performance Through Soil-Plant Interaction

Optimising soil and plant interaction is key to improving agricultural productivity and sustainability. By understanding the complex processes that govern nutrient uptake, farmers can implement more effective soil management and fertilisation practices. This knowledge allows for better utilisation of resources, reducing input costs while increasing crop yields. Kynoch Fertilizer’s range of enhanced-efficiency fertilisers, along with expert agronomic advice, can help farmers optimise their fertilisation programmes for long-term success.

For personalised advice on improving nutrient management and soil health, contact Kynoch Fertilizer’s experienced agriculturalists on 011 317 2000 or info@kynoch.co.za

Compiled by: Hentie Cilliers or Chris Schmidt from Kynoch Fertilizer

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References

• Barber, S.A. (1995). Soil Nutrient Bioavailability: A Mechanistic Approach. 2nd edition. John Wiley & Sons.
• Marschner, H. (1995). Mineral Nutrition of Higher Plants (2nd edition). Academic Press, San Diego.
• McKenzie, B.M., Mullins, C.E., Tisdall, J.M., Bengough, A.G. (2012). Root-soil friction: Quantification provides evidence for measurable benefits for manipulation of root-tip traits. Plant Cell Environ, 36, 1085-1092.
• Mengel, K. (1995). Roots, Growth and Nutrient Uptake. Department of Agronomy publication # AGRY-95-08 (Rev. May-95). Purdue University, USA. Link. Accessed on 27 August 2024.

The post Unlocking Soil-Plant Interaction: Boost Crop Growth with Enhanced Fertilisation Strategies first appeared on Kynoch Fertilizer.

Regular soil testing is crucial for monitoring the status of the soil solution.

When discussing crop nutrition, the focus is often on soil nutrient levels. However, many processes and interactions occur in the soil solution, which is a dynamic mixture of water, dissolved nutrients, minerals and organic compounds present in the soil’s pore spaces.

The soil solution plays a crucial role in delivering nutrients to plant roots, supporting biochemical processes and facilitating the uptake of essential elements. Key factors affecting the soil solution include:

SOIL PH

The soil pH influences nutrient availability and mineral solubility. Outside the optimal range, certain nutrients become less soluble while others may become toxic. Acidic soils reduce the availability of nutrients like phosphorus, calcium and magnesium while increasing the solubility of toxic metals like aluminium and manganese. Alkaline soils limit the availability of essential micronutrients like iron, zinc, and manganese.

SOIL TEXTURE

The proportion of sand, silt and clay particles affects water and nutrient retention. Sandy soils have larger particles and fewer binding sites, which leads to poor nutrient retention and a higher risk of nutrient leaching.

Clay soils have fine particles and high nutrient-holding capacity but can sometimes retain nutrients too tightly, limiting their availability.

CATION EXCHANGE CAPACITY

Cation exchange capacity (CEC) is a measure of a soil’s ability to hold and exchange positively charged ions (cations) like potassium, calcium and magnesium. Soils with a higher CEC (typically clay or those rich in organic matter) can hold more nutrients, making them available to plants over time. Low-CEC soils (usually sandy soils) have a lower nutrient-holding capacity, leading to more frequent nutrient deficiencies.

SOIL STRUCTURE

Well-structured soil has better aeration and allows for easier root penetration, facilitating nutrient access. Compacted soil, on the other hand, can restrict root expansion and reduce nutrient uptake.

ORGANIC MATTER

Organic matter, including compost and decomposed plant material, enriches the soil solution by increasing nutrient availability and improving soil structure.

As organic matter decomposes, it releases nutrients into the soil solution and enhances the soil’s ability to retain water and nutrients, which benefits plant roots.

SOIL MOISTURE

Water is the medium through which nutrients are dissolved and transported to plant roots. Excess moisture can cause the leaching of nutrients, especially nitrogen. Lack of moisture reduces the solubility and movement of nutrients, limiting plant uptake.

SOIL MICROBIAL ACTIVITY

Micro-organisms in the soil play a crucial role in nutrient cycling. They break down organic matter, fix atmospheric nitrogen, and solubilise phosphorus and other nutrients, making them available to plants. Healthy soils with active microbial communities promote faster nutrient cycling and greater nutrient availability in the soil solution.

SOIL COMPACTION

Compacted soil has reduced pore spaces, limiting water infiltration, air movement, and root penetration. This can impede the movement of nutrients in the soil solution and restrict the plants’ access to them.

TEMPERATURE

Warmer temperatures generally increase microbial activity, speeding up nutrient cycling and availability. Cold soil slows down microbial processes and reduces nutrient availability, especially nitrogen mineralisation.

NUTRIENT INTERACTIONS

Fertilisation aspects – such as frequency of application, nutrient concentration, chemical form, and nutrient solubility – need to be considered. Enhancing the soil solution can significantly improve nutrient availability, ensuring plants have access to the essential elements they need for optimal growth and productivity.

Email info@kynoch.co.za, phone

011 317 2000, or visit kynoch.co.za

Kynoch – Enhanced efficiency through innovation

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Mankind is dependent on the soil for its needs for food and fibre for humans, feed for livestock, and, of late, contributing to our energy supply with crops grown primarily for biofuels. Soil is a dynamic and multifunctional living system that exists as a relatively thin layer on the Earth’s crust. (Singh & Ryan 2015).  Soil is not an inert growing medium – it is a living and life-giving natural resource. It is teaming with billions of bacteria, fungi, and other microbes that are the foundation of an elegant symbiotic ecosystem (USDA).

Soil health is defined as the continued capacity of soil to function as a vital living ecosystem that sustains plants, animals, and humans (USDA).

As world population and food production demands rise, keeping our soil healthy and productive is of paramount importance. By farming using soil health principles and systems that include no-till, cover cropping, and diverse rotations, more and more farmers are increasing their soil’s organic matter (SOM) and improving microbial activity. As a result, farmers are sequestering more carbon, increasing water infiltration, improving wildlife and pollinator habitat—all while harvesting better profits and often better yields (USDA).

Soil Organic Carbon (SOC) found in the living matter in soils acts as a sink that traps and stores CO₂ – a major contributor to global warming. Soils represent the largest terrestrial pool of carbon: each hectare can store up to 50 – 300 tonnes of carbon (UNCCD 2014).

By increasing crop yields and productivity on available arable land, fertilisers help protect carbon-rich forests, peatlands, wetlands and grasslands by minimizing land use changes. Increased productivity through fertiliser use has spared 1 billion hectares of virgin land from cultivation between 1961 and 2005 and saved the equivalent of 317 – 590 billion tonnes of CO₂ emissions (the same as total global pre-1800 CO₂ emission levels) (Burney et.al. 2010).

With better management, farmland soil could also store up to an extra 1.85 billion tonnes of carbon each year (7 billion tonnes of CO₂): around the same amount of CO₂ emitted every year by the global transport sector (Zomer et. al. 2017).

The best way to capture more carbon on farmland is to use fertilisers to optimize plant growth and yields and leave crop residues in the field after harvest.

For every 2 – 3 tonnes of carbon stored above ground in plants, one (1) or more tonnes of carbon are generally stored below ground in the roots and root exudates.

Applying fertilisers following the 4R nutrient stewardship principles (Right nutrient source at the Right rate, at the Right time and in Right place) enhances nutrient use efficiency, which reduces nutrient losses to the environment, including in the form of greenhouse gases. Effective and efficient fertilization is a vital part of the climate-smart agricultural practices that could reduce global emissions by 5.5 to 6 billion tonnes of CO₂ equivalent per year: around the same as removing 1,500 coal-fired power plants from the energy sector (Smith et. al. 2007).

To help fight climate change we need to use fertilisers globally to grow more crops on existing farmland to protect carbon stored in wild ecosystems and increase the carbon stored in our agricultural soils (IFA 2018).

References:

• Bijay Singh and John Ryan 2015. Managing Fertilisers to Enhance Soil Health. First edition, IFA, Paris, France, May 2015. Copyright 2015 IFA.
• International Fertiliser Association (IFA) 2018. Integrated Plant Nutrient Management
• Jennifer A. Burney, Steven J. Davisc, and David B. Lobella, 2010.  Greenhouse gas mitigation by agricultural intensification.  Proceedings of the National Academy of Sciences (PNAS), June 15, 2010 107 (26) 12052-12057.
• Smith, P., D. Martino, Z. Cai, D. Gwary, H. Janzen, P. Kumar, B. McCarl, S. Ogle, F. O’Mara,  C.  Rice, B. Scholes, O. Sirotenko, 2007: Agriculture. In Climate Change 2007: Mitigation. Contribution of Working Group III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change [B. Metz, O.R. Davidson, P.R. Bosch, R. Dave, L.A. Meyer (eds)], Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA.
• UNCCD (2014) The land in numbers: Livelihoods at the tipping point. 2014. Secretariat of the United Nations Convention to Combat Desertification ISBN: 978-92-95043-90-9
• United States Department of Agriculture: Natural Resources Conservation Service: Soil Health.
• Zomer, R.J., Bossio, D.A., Sommer, R., & V. Verchot, (2017). Global Sequestration Potential of Increased Organic Carbon in Cropland Soils. Sci Rep 7, 15554.

Author: Graham Peddie from Kynoch Fertilizer

Soil Health in Sustainable Agriculture

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Take note that reference is often made regarding soil acidity, without specifying the relevant pool of acidity that is being referred to. Obviously, every pool would require different quantities of calcium carbonate and/or magnesium carbonate to neutralize the acidity. That brings it to the question of what the term soil acidity, really entails? Does it refer to acidity from the plants’ perspective, the soils’ perspective, or both, and also which pools of acidity?

Types of soil acidity

Beginning with soil-pH, individuals tend to speak of soil acidity and liming with a pH-value in mind, not realising that different pools of acidity exist. The pool of acidity reflected by measuring the soil-pH, is called, active acidity, an expression of the concentration of H⁺-ions in the soil solution (Schroeder, 1984). The H⁺-ions as such is not the toxic element towards plant roots, associated with typical visual Mg-deficiency symptoms.  However, a low soil-pH causes increased or decreased solubility of cations, resulting in indirect negative plant reactions.  Also, at a high soil-pH, complexation of nutrients also happens, except for molybdenum.  The impact of soil-pH unto solubility and availability of nutrients in the soil was already illustrated in a diagram by Truog during 1943 (Bedassa, 2020). Solubilized aluminium ions (Al³⁺) are toxic towards plants and suppressing magnesium uptake (Mg²⁺), unfortunately not reflected directly in the soil-pH measurement. Although soil-pH is a useful index commonly measured when testing soil, it is often misunderstood and misused (WPHA, 2002).

Total acidity in acid soils is defined as consisting of two components, as indicated below:

Total acidity =            exchangeable acidity + residual acidity

Total acidity can be determined by the titration of a soil suspension in a salt solution to a reference pH using a strong base or addition of increments of lime.  However, a standard method for the determination of total acidity is to react a soil for several hours or overnight with a solution containing 0.5M BaCl₂ (0.5 moles barium chloride solution), plus a triethanolamine (TEA) buffer adjusted to pH 8.0 or 8.2. Triethanolamine is well buffered at pH 8. The Ba²⁺ is included to displace acidity from soil components. A reference pH of 8.0 or 8.2 was chosen to represent the pH attained when a soil is limed with excess lime; also, the Al³⁺ acidity bound to clays is neutralized (Bloom, 2000).

Exchangeable acidity is the hydrogen (H⁺) and Al⁺ extractable with IM KCI (1 mole potassium chloride salt extractable acidity; Bloom, 2000), in other words, the titratable hydrogen (“and Aluminium”[1]) that can be replaced from the absorption complex by a neutral salt (Van der Watt & Van Rooyen, 1995). In order to interpret the impact of meaning of an exchangeable acidity value expressed in centimol per kilogram of soil (cmol_ckg^-1) as a percentage of acidity, acid saturation need to be calculated.  The following formula is used:

Acid saturation (%) = ((100 x (extractable acidity)) / T-value), where

Extractable acidity is the sum of salt extractable H⁺ and Al³⁺ cations expressed in cmol_ckg^-1 and the T-value of the soil, also in the same unit of measurement (FERTASA, 2016).

Residual acidity is the acidity titrate-able, but not easily exchangeable acidity (non-extractable). Residual acidity is determined by the difference between the total acidity neutralized by raising the pH to a reference level (7.0 or 8.0) and the salt extractable acidity (Bloom, 2000).

Buffer Capacities of soils

Because of the differences in buffer capacity of soils, those of similar pH may require vastly different quantities of lime to yield the same increase in pH (Bloom, 2000). Any decent agricultural lime proposal should keep the buffer capacity of soil in mind.  This suggest that on weak buffered soils (mostly sandy soils), liming could more easily done according to pH, while liming on highly buffered soils (mostly clayish soils) should rather be based on acid saturation.

Soil buffer capacity, influenced by soil texture, organic matter, and mineral composition, determines the soil’s ability to resist pH changes. Liming, the application of calcium and magnesium carbonates, can help neutralize soil acidity and improve fertility. However, the effectiveness of liming depends on the soil’s buffer capacity, with highly buffered soils requiring more lime to achieve the same pH increase.

Conclusion

Accurate interpretation of soil acidity requires understanding the critical definitions of active, exchangeable, and residual acidity. By recognizing the significance of each type and their interrelationships, farmers and soil managers can develop effective strategies to manage soil acidity, optimize soil fertility, and promote healthy plant growth.

References

Bedassa M (2020) Soil acid Management using Biochar: Review. Int J Agric Sc Food Technol 6(2): 211-217. OI: https://dx.doi.org/10.17352/2455-815X.000076 referring to Emil Troug (1943) USDA Year book of Agriculture. 42

Bloom, P.R., 2000.  Soil pH and pH buffering. In: M.E. Sumner (ed.). Handbook of soil science. CRC Press.

FERTASA, 2016. Bemestingshandleiding. Agste hersiene uitgawe. Fertilizer Association of Southern Africa. Pretoria.

Schroeder, D., 1984. Soils – Facts and concepts. International Potash Institute, Bern, Switzerland.

Van Der Watt, H.v.H. & Van Rooyen, T.H., 1995.  A Glossary of Soi8l Science.  The Soil Science Society of South Africa, Pretoria.

WPHA, 2002. Western Fertilizer Handbook. 9^th edition. Western Plant Health Association.

Compiled by Chris Schmidt, Senior Agriculturalist Kynoch Fertilizer. Contact us on 011 317 2000.

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As a wheat farmer in South Africa, you understand the importance of optimal soil preparation and fertilisation for a successful harvest. Soil testing and targeted fertilisers are crucial components of this process, helping you identify and address nutrient deficiencies to ensure healthy plant growth. In this article, we’ll delve deeper into the world of soil testing, nutrient deficiencies, and targeted fertilisers, providing you with the knowledge and resources you need to optimise your wheat farming operations.

Soil Testing: The First Step

Soil testing is the foundation of optimal “nutritional” soil preparation that should be done well in advance. It helps you determine the soil’s fertility status (including pH, cations, and phosphorus content, sulphur content, acidity, and silt and clay content, aka texture; as well as all trace elements), enabling you to make informed decisions about correctional fertiliser applications prior to planting, as well as the best suitable fertiliser to apply during planting. The latter will be determined by the soil status, as well as the crop demand, linked to expected yield potential. In the winter rainfall area of South Africa (Western Cape), it is also very important to measure the rock and coarse fragments in the soil sample. According to the Agricultural Research Council, soil testing every 3-5 years is recommended to monitor changes in soil health and adjust your management strategies accordingly (Agricultural Research Council, 2022). Kynoch advises testing every 3 years.

Common Nutrient Deficiencies in Wheat Farming

Wheat crops require a balanced mix of nutrients to thrive. In general, some of the most common nutrient deficiencies in wheat farming include:

1. Nitrogen (N): Essential for plant growth and development, nitrogen deficiency can lead to stunted plants, reduced yields, and poor grain quality.
2. Phosphorus (P): Crucial for root development, phosphorus deficiency can result in reduced plant growth, poor water uptake, and decreased yields.
3. Potassium (K): Important for plant water balance and disease resistance, potassium deficiency can lead to weakened plants, reduced yields, and increased susceptibility to disease.
4. Trace elements: Depending on soil conditions, deficiencies of micro-elements could be expected. If the soil is acidic, elements like molybdenum could be deficient; if the soil is sandy, elements like copper, zinc, boron, iron, and manganese could be deficient. If the soil is alkaline, basically all trace elements, except molybdenum, could be deficient.
5. Soil acidity: Wheat is very sensitive to soil acidity (expressed as acid saturation). It is imperative for wheat production to try and keep acid saturation at less than 1%. The only way to neutralise acidity is by applying agricultural lime, whether dolomitic or calcitic (depending on the soil’s calcium-to-magnesium ratio). Lime could be obtained from dedicated lime supplying companies.

Targeted Fertilisers: Addressing Nutrient Deficiencies

Targeted fertilisers are designed to address specific nutrient deficiencies, providing your wheat crop with the necessary nutrients for optimal growth and development. Mostly, some serious elemental deficiencies identified through the soil analysis done prior to planting could be rectified before planting by targeted fertilisers containing phosphorus, potassium, sulphur, and magnesium. An element like nitrogen will always be applied during planting, with the remaining portion applied just before planting (pre-plant application), or as a top dressing 4 to 6 weeks after emergence. The planting blend, consisting primarily of nitrogen, phosphorus, and potassium, will be made up of different ratios according to crop preference and soil conditions. For instance, in the Vaalharts-irrigation scheme, a 7:3:3 or 2:3:2 N:P:K-ratio fertiliser is popular. In the dry-land summer rainfall areas, a 4.1.0 or 8.2.1 N:P:K-ratio fertiliser could be used. In the winter rainfall area, MAP is a popular option.

Reputable Resources for South African Wheat Farmers

For further guidance on soil testing, nutrient deficiencies, and targeted fertilisers, consult the following reputable resources:

1. Agricultural Research Council – Small Grain Institute (ARC-Small Grain Institute)
2. Fertilizer Association of Southern Africa (FERTASA)
3. NviroTek Laboratories ((link unavailable))

You can find more information on these resources through online searches or by consulting with local Kynoch agricultural experts and extension services. Other laboratories in South Africa could also be found online.

Conclusion

Optimising soil preparation and fertilisation is critical for successful wheat farming in South Africa. By understanding the importance of soil testing, identifying common nutrient deficiencies, and applying targeted fertilisers, you can ensure healthy plant growth, improved yields, and enhanced grain quality. Remember to consult reputable resources for guidance and support, helping you make informed decisions for your wheat farming operations.

Note:

1. The article is written in a clear and concise manner, making it easy to understand, and is based on reputable sources. It is not intended to be an exhaustive or technical guide, but rather a helpful resource for South African wheat farmers and producers.
2. Wheat production and practices for the summer and winter rainfall areas differ from one another. Please note the differences in reference sources.

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