Author: NZ Business Connect

In South Island, New Zealand, the diversity of soil types offers a unique tapestry that underpins the region’s agricultural and horticultural potential. The island’s varied landscapes are dominated by Podzol soils in the west, Brown and Pallic soils in the east, and semi-arid Brown stony soils in Central Otago. Agraforum New Zealand, based in Canterbury, provides valuable insights into these soils and offers guidance on optimising their use.

Podzol Soils of the West: Characterised by their acidic nature and leached profile, Podzol soils are typically found under forested areas. These soils are often challenging for traditional farming due to their low fertility. However, they are excellent for forestry and certain types of berry cultivation. Enhancing these soils with appropriate organic amendments can improve their productivity for selected crops.

Brown and Pallic Soils of the East: These soils are more fertile and versatile. Brown soils, which are prevalent on terraces and in hill country, are well-drained and suitable for a range of pastoral activities. Farmers can maximize yields by employing regular soil testing and tailored fertilization plans to maintain nutrient levels. Pallic soils, found in both rolling lands and flat terraces, often require careful management to avoid issues with drought stress, particularly under low rainfall conditions. Strategic irrigation and the use of drought-resistant crop varieties can help capitalize on their agricultural potential.

Semi-arid Brown Stony Soils of Central Otago: These soils are unique to the arid conditions of Central Otago. Their stony texture provides excellent drainage, making them ideal for vineyards and stone fruit orchards. Viticulture thrives here, with the region’s renowned Pinot Noir attributing much of its character to these distinctive soils. Proper nutrient management and efficient water use are crucial for sustainable production.

For all these soil types, sustainable practices such as crop rotation, soil testing, conservative tillage, and the integration of organic matter are recommended to enhance soil health and ensure long-term productivity. Agraforum New Zealand continues to support local farmers and growers in adapting these practices, ensuring that the rich soils of South Island are used to their fullest potential.

Contact Agraforum New Zealand

Mobile: 0274 485 159
Email: allan@agraforum.co.nz

www.agraforum.co.nz

Contact Phillip Quay
phillip@mediapa.co.nz
P: 0274 587 724
www.mediapa.co.nz

**Subject to availability**

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Enforcer’s innovative formulation allows for a 75-day nitrogen release, which ensures a steady supply of this crucial nutrient. This slow release is particularly beneficial during the critical growth phases of crops, reducing the risk of nitrogen leaching into waterways and thereby supporting environmental sustainability. Additionally, the product features a long-term release of phosphate and sulphur, essential nutrients that support root development and overall plant health.

Ideal for application from late autumn to early spring, Enforcer provides a robust nutrient foundation that supports plant growth throughout the colder months when nutrient uptake can be challenging. Its high calcium content is especially beneficial for soil structure, helping to improve water infiltration and aeration, which are crucial for healthy root development.

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Contact Profile Fertilisers

Don Henderson: 021 643 698

donh@profilefert.co.nz

www.profilefert.co.nz

Contact Phillip Quay

Media PA

phillip@mediapa.co.nz

027 458 7724

www.mediapa.co.nz

Soil structure plays a pivotal role in determining the agricultural productivity and sustainability of New Zealand’s diverse landscapes. Dr. Gordon Rajendram, a leading soil scientist, examines how the structural integrity of soil affects everything from water retention and drainage to root development and nutrient uptake. Understanding these differences is crucial for effective farm management and long-term soil health.

In New Zealand, soil structure varies significantly not only between the volcanic soils in regions such as Waikato and Taranaki, and the sedimentary soils found predominantly in areas like Canterbury but also across other soil types such as peaty soils in wetter regions and clay soils in drier areas. Volcanic soils benefit from a loose, porous structure due to the presence of allophane, a mineral that not only enhances soil stability but also aids in significant carbon storage, with carbon levels reaching 10-12%, thereby enriching the soil’s organic content. This structure promotes excellent water retention and nutrient availability, making these soils ideal for high-demand agricultural activities, such as dairy farming.

Conversely, sedimentary soils present different challenges. Dr. Rajendram explains, “Sedimentary soils tend to be denser and can suffer from compaction more easily, which reduces aeration and negatively impacts root penetration and moisture permeability.” These soils typically have lower organic matter content, generally around 3-5% carbon, making them more prone to degradation. which can lead to faster degradation and fertility loss over time if not managed correctly.

Peaty soils, while excellent for specific horticultural uses due to their high organic matter content, require careful water management to prevent over-saturation, which can suffocate plant roots. Similarly, clay soils, known for their ability to retain water, are advantageous in drier regions but can become hard and crack when dry, posing challenges for root growth and soil aeration.

Effective management practices are essential for maintaining the health of all these soil types. Dr. Rajendram highlights that strategies such as regular soil testing, appropriate crop rotation, and the careful application of organic amendments are vital. For volcanic soils, maintaining the structural integrity involves minimal tilling and controlled grazing to prevent compaction. For sedimentary soils, improving structure may involve more frequent organic matter addition and careful water management to avoid surface crusting and compaction.

Dr. Rajendram emphasises that by tailoring farming practices to the specific type of soil structure, New Zealand farmers can enhance productivity and ensure the sustainability of their valuable agricultural lands.

 Contact Dr Gordon Rajendram

021 466077

rajendram@xtra.co.nz

www.gordonrajendramsoilscientist.co.nz

Contact Phillip Quay

phillip@mediapa.co.nz

027 458 7724

www.mediapa.co.nz

In the diverse agricultural landscape of New Zealand’s North Island, understanding and enhancing soil structure is crucial for farming success. Profile Fertilisers stands at the forefront of providing tailored soil solutions that cater to the unique characteristics of the region’s varied soil types, from volcanic soils in areas like Waikato and Taranaki to the granular and pumice soils of the Central Plateau and the Northland region.

Volcanic soils, known for their rich allophane content, offer excellent water retention and nutrient availability, which are advantageous for farming. However, these soils also require careful management to prevent compaction and maintain their organic content. Profile Fertilisers supports these efforts with bespoke fertiliser blends that maintain the delicate nutrient balance essential for preserving the structural benefits of allophane-enhanced soils.

In addition to volcanic soils, the North Island features granular soils and pumice soils, which present their own set of challenges and benefits. Granular soils, often found in Northland, require careful nutrient management to avoid leaching due to their typically coarse texture. Pumice soils, whilst well-drained and light, can be nutrient-poor and prone to erosion. Profile Fertilisers addresses these issues with specially formulated products that improve nutrient retention and soil stability, enhancing plant growth and soil health.

Profile Fertilisers advocates for practices such as minimal tilling and controlled grazing to protect soil structure across these varied types. Their slow-release fertilisers encourage deep root development, crucial for maintaining soil porosity and aeration. This approach not only helps in preventing compaction but also optimises the absorption of nutrients, reducing the risk of runoff and environmental impact.

For farmers in New Zealand’s North Island, adapting fertilisation strategies to the specific needs of their soil type is key. Profile Fertilisers provides not only the necessary nutrients but also expert advice and support to ensure that soil management practices lead to sustainable productivity and long-term success. Through strategic partnerships with Profile Fertilisers, New Zealand farmers can enhance the health and productivity of their diverse soil types, securing the sustainability of their agricultural ventures.

Contact Profile Fertilisers

Don Henderson: 021 643 698

donh@profilefert.co.nz

www.profilefert.co.nz

Contact Phillip Quay

phillip@mediapa.co.nz

027 458 7724

www.mediapa.co.nz

Agraforum New Zealand, a key player in agricultural consultancy, focuses on the varied landscapes of New Zealand’s South Island, which present unique challenges and opportunities for soil management. The region’s predominant sedimentary soils, derived from greywacke and other sedimentary rocks, are distinct from the volcanic soils found in the North Island. These sedimentary soils, especially prevalent in areas like Canterbury, play a central role in the island’s dairy farming operations.

These soils in the South Island typically feature lower organic matter levels, with carbon content generally ranging between 3-5%. Agraforum New Zealand recognises the susceptibility of these soils to degradation, particularly due to their finer and less robust structure. “The structural challenges of sedimentary soils make them prone to compaction, significantly impacting their fertility and the productivity of our farms,” notes Dr Gordon Rajendram, a leading soil science expert working alongside Agraforum NZ.

The intensive agricultural practices common across the South Island, including continuous dairy farming and cropping, often exacerbate soil degradation. The frequent use of chemical fertilisers, such as Diammonium Phosphate (DAP) and ammonium sulphate, leads to soil acidification, which in turn diminishes soil quality. “Such practices disrupt the microbial life within the soil, which is vital for sustaining soil health and fertility,” explains Dr Rajendram.

Despite these challenges, the South Island’s diverse soil types, including loess in some regions, offer significant agricultural potential beyond traditional dairy farming. These fine, wind-blown silt particles are particularly well-suited for viticulture and certain types of horticulture, industries where the South Island has carved a niche.

One of Agraforum NZ’s testing locations

Committed to promoting sustainable soil management practices, Agraforum New Zealand advocates strategies such as crop rotation, reduced tillage, and the strategic use of soil tests and analysis to maintain or improve soil health. By adopting these sustainable practices, Agraforum aims to ensure the longevity and productivity of the agricultural lands, preserving the unique soil landscape of New Zealand’s South Island for future generations.

Contact Agraforum NZ

Mobile: 0274 485 159
Email: allan@agraforum.co.nz

www.agraforum.co.nz

Contact Phillip Quay
phillip@mediapa.co.nz
P: 0274 587 724
www.mediapa.co.nz