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Walnuts

Orchard investment in walnuts has seen an increase as new varieties and improved propagation, along with improved orchard management, have increased nut yield. Along with strong global demand, an absence of pests and disease, and the fact walnuts are wind pollinated.

Specific considerations for walnuts

Ongoing supply of nutrients to walnuts, through roots or leaves, is essential in achieving optimal yields. Translocation of nutrients from leaves to nuts is poor in walnuts so macro and micronutrients need to be supplied in forms that are continually available. Importantly, for walnuts, boron mobility is limited and given it’s importance to fruit set and maturation monitoring and use of sustained release, forms of boron are beneficial.

Improving soils to enhance nutrient retention, cycling, and delivery, as well as use of sustained release fertilisers like BioAgPhos and sustained release micronutrients, such as BioAgBor, improve delivery of nutrients to walnut trees through the entire season.

The BioAg approach

BioAg nutrition programs are incorporated into a growers current nutrition program. Our objective is to make fertiliser and other inputs work better and build and support healthy and balanced soils and plants. Programs are custom-made for each block, using advanced soil and tissue analysis. These integrated programs typically incorporate a range of BioAg solid and liquid nutrients, often associated with conventional inputs. BioAg fertility programs can be developed to meet organic certification requirements.

Soil test

An experienced and Fertcare accredited BioAg agronomist works with you and provides technical expertise on your crop. If you don’t already have recent soil test data, we arrange a soil test for you. The results provide essential information about the soil fertility and soil structure for better performance.

A tailored program

Based on the results of soil tests, crop requirements and other factors such as soil structure, climate, history of the block, and targets that you are trying to achieve, we provide a tailored program that aims to improve soil fertility and maximise yield response. We support you through the program to ensure that inputs are applied at the right time, in the right way.

Leaf and tissue testing

Any nutritional program cannot foresee the changes in weather, disease, or pests, that may impact a crop.  During the season, growers may observe issues or evidence of stress in their crop. This may be due to greater growth or yields than planned, a trace element shortage or abiotic stresses. An on-farm inspection and associated leaf or tissue tests will promptly identify any issues, which can quickly be addressed by applying the appropriate inputs.

High yielding crops require fertile balanced soils

Key to highly productive crops is the function of soils. Soil structure, chemistry and biology are critical in supporting crops throughout the growing season. By improving all aspects of the soil, crops will benefit from improved access to moisture, due to improved infiltration and water holding capacity, improved access to nutrition through improved nutrient cycling, fixation (for N) and a reduction in loss pathways, improved resilience to abiotic stresses and disease, improved root growth providing access to additional moisture and nutrients as well as improved carbon sequestration and a range of other benefits (link to resources - soil health).

Beneficial microorganisms stimulate the plant’s root growth and help protect it from abiotic stresses. This is made possible through mutually beneficial relationships that microbes develop with plants, for example mycorrhizal associations.   BioAg products programs supply essential macronutrients (N, P, K, S, Ca), trace elements (B, Zn, Cu etc.),  microbial food and metabolites beneficial microorganisms that colonise root systems, improving soil function, plant health and productivity.

Several almonds lay on a flat surface

Walnuts– key features of a BioAg program

The following table illustrates the cropping process and potential solutions depending on soil test results and other contributing factors. Call your BioAg Area Manager to discuss your individual needs.

Post Harvest
Objective
Support tree recovery and monitor soils.
Activity
Apply nitrogen and stimulants to enhance nutrient supply from soils. Perform soil tests.
BioAg Product
Soil & Seed: 3 – 5L/ha
Dormancy
Objective
Build soil nutrition and structure for the coming season and support early growth with appropriate levels of P and Ca.
Activity
Apply ameliorants, solid fertilisers and required micronutrients into vine rows.
BioAg Product
BioAgPhos: 100 – 250kg/ha
Dormancy
Objective
Build soil nutrition and structure for the coming season and support early growth with appropriate levels of P and Ca.
Activity
Apply ameliorants, solid fertilisers and required micronutrients into vine rows.
BioAg Product
BioAgSop: 100 – 300kg/ha
Dormancy
Objective
Build soil nutrition and structure for the coming season and support early growth with appropriate levels of P and Ca.
Activity
Apply ameliorants, solid fertilisers and required micronutrients into vine rows.
BioAg Product
BioAgBor: based on soil test results.
Prebudburst
Objective
Improve delivery of nutrients from soil to trees.
Activity
Apply biostimulants to soils.
BioAg Product
HydraHume: 10 – 20L/ha
Budburst
Objective
Stimulate root activity and improve nutrient uptake from soils.
Activity
Apply biostimulants to soils.
BioAg Product
Soil & Seed: 8 – 10L/ha
Foliage emergence
Objective
Stimulate canopy growth and early leaves resilience to frost.
Activity
Apply foliar stimulant.
BioAg Product
HydraSea 50: 0.5 – 1L/ha
Preflowering (appearance of catkins)
Objective
Address nutrition deficiencies, use tissue test to identify issues.
Activity
Supply important micronutrients, vitamins, and minerals through foliars combined with a chelator and growth stimulant to enhance uptake.
BioAg Product
Balance & Grow: 2 – 4L/ha with foliar trace elements.
Flowering
Objective
Enhance nutrient uptake from the soil.
Activity
Apply biostimulants to soils.
BioAg Product
Soil & Seed: 2 – 4L/ha
Nut set
Objective
Enhance nut set.
Activity
Supply important micronutrients, vitamins, and minerals through foliars combined with a chelator and growth stimulant to enhance uptake.
BioAg Product
Balance & Grow: 2 – 4L/ha with foliar trace elements.
Early nut development
Objective
Enhance nutrient uptake from the soil.
Activity
Apply biostimulants to soils.
BioAg Product
Soil & Seed: 2 – 4L/ha
Early nut development
Objective
Enhance nut fill by enhancing nutrient and energy supply to nuts.
Activity
Supply important micronutrients, vitamins, and minerals through foliars combined with a chelator and growth stimulant to enhance uptake.
BioAg Product
Fruit & Balance: 2 – 4L/ha
Larger sized nut growth
Objective
Enhance nutrient uptake from the soil.
Activity
Apply biostimulants to soils.
BioAg Product
Soil & Seed: 2 – 4L/ha
Larger sized nut growth
Objective
Improve tolerance to stress.
Activity
Apply foliar biostimulant.
BioAg Product
HydraSea 50: 0.5 – 1L/ha
Kernel growth up to nut split
Objective
Address nutrition deficiencies and improve nutrition uptake.
Activity
Supply important micronutrients, vitamins and minerals through foliar nutrients and biostimulant.
BioAg Product
Fruit & Balance: 2 – 4L/ha

Walnut resources

  • Soil carbon

    Like most elements carbon can be present in soils in different forms. Carbon is present as organic or inorganic carbon. Inorganic carbon is mineral based with its most common form being calcium carbonate. The carbon present in soil organic matter is referred to as organ...

    Read more
  • Regenerative agriculture

    The term regenerative agriculture has become aligned, or associated hand in hand, with the improvement of soils, improved soil fertility, and the benefits this provides to farms and rural communities. The approach typically promoted is a holistic one, taking into accoun...

    Read more
  • The importance of soil carbon

    Carbon is the main element present in soil organic matter, on average making up 58% by weight. The carbon present in soil organic matter is referred to as organic carbon. Soil organic carbon is a vital component of productive agriculture. In addition sequestration of ca...

    Read more
  • Post-harvest – an important period for tree and vine crops

    The post-harvest period is critical for perennial tree crops and vines to recover from stress. This is an optimal time to replenish nutrient reserves for the next season as vegetation and roots are still active and able to absorb applied nutrients. Applications replace ...

    Read more

Recommended products

bag of BioAg Phos solid fertiliser

BioAgPhos

Solid Fertiliser

Highly reactive phosphate fertiliser made from high-grade reactive phosphate rock combined with BioAg’s microbial digesting agent.

BioAg product shot of BioAg SoP

BioAgSoP

Solid Fertiliser

Organically certified granular form of fertiliser containing potassium and sulphur. Immediately available to crops and plants. Ideal for crops with a high potassium demand and sensitive to chloride.

BioAg Biostimulant product HydraHume

HydraHume

Biostimulant

A liquid solution of Potassium Humate providing a product suited to building soil humus and increasing soil fertility.

BioAg Biostimulant product Soil & Seed

Soil & Seed

Biostimulant

Formulated to improve soil microbial activity, natural soil fertility and moisture and nutrient utilisation.

BioAg Biostimulant product HydraSea 50

HydraSea 50

Biostimulant

A natural seaweed extract that delivers a number of beneficial organic compounds and minerals to crops and pastures.

BioAg Biostimulant product Balance & Grow

Balance & Grow

Biostimulant

Formulated to increase vegetative growth, root development and soil microbial activity. Ideal for broadacre, pastures and horticulture.

BioAg Biostimulant product Fruit & Balance

Fruit & Balance

Biostimulant

Formulated to increase flowering, fruit set and soil microbial activity. Fruit & Balance enhances the nutritional value and quality of fruit or grain by increasing plant sugar levels.

BioAg product shot of BioAgBor

BioAgBor

Trace Element

A sustained-release form of boron suited to a range of enterprises such as horticulture, vegetables, pastures and field crops.

bag of BioAg Phos solid fertiliser

Committed to organics

With a core range of natural fertilisers and biostimulants, BioAg can offer an extensive range of products certified by Australian Organics, suitable for use in organic systems.