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Tag archive: nitrogen

Focus on nitrogen and biomass for better canola

  Not enough nitrogen is the most common limit to canola yield. The current key messages on nitrogen (N) for canola crops are: biomass is the biggest driver of canola yield low N limits biomass low biomass limits water and nutrient uptake canola crops need 80 kg of available N […]

How to improve results from dual purpose crops

Responsive nitrogen (N) management optimises grain yield and grazing value from dual-purpose crops. Dual-purpose crops are sown early, grazed during winter, then grown on to produce grain. For dual purpose crops in the southern region the framework for N nutrition should be: Apply adequate N upfront to promote vigorous forage […]

How much nitrogen are we losing?

Around 25–30% of nitrogen (N) applied to paddocks is lost each season in the northern region. Researchers are not recovering this nitrogen from the soil or the crop biomass. Isotope labelled 15N fertiliser is used to track fertiliser nitrogen through the cropping system. Field trials in NSW and Queensland with […]

Webinar: How to check your pulse-N

Pulse crops can be a valuable source of nitrogen within cropping systems. The amount of N fixed by legumes can vary substantially and is affected by the species of crop, soil and seasonal conditions and crop management factors. In this webinar, QDAF senior agronomist Howard Cox and researcher Professor David […]

How to manage nutrients after waterlogging

Waterlogging affects nutrients in soils, and reduces the ability of plant roots to take up nutrients. Root functions require oxygen. Root growth and access to soil nutrients are restricted in waterlogged soils. Soil test before planting the next crop to check nutrient status. Nitrogen (N), potassium (K), sulphur (S) and […]

How to adjust crop nutrition after a good year

High grain yields mean high rates of nutrient removal, in particular, nitrogen (N) and phosphorous (P). Soil fertility in the paddock declines unless nutrients are replaced. Soil and grain tests help you make better nutrient budget decisions. Reference values for nutrient removal are just an indication (especially for P): A […]

The latest on Nitrogen at the 2017 GRDC Updates

Managing N loss risks – Chris Dowling Practical N management can minimise the economic impact of N loss events. Chris Dowling from Back Paddock Company presented at the Bellata Update. Denitrification and managing nitrogen loss risk – key factors affecting loss. Nitrogen application – Richard Daniel The rate of nitrogen […]

When do retained stubbles increase the need for nitrogen?

Microbes use nitrogen (N) from the soil to decompose stubbles. When stubbles have a high carbon: nitrogen (C: N) ratio, soil mineral N is tied-up. Cereal stubbles have a high C: N ratio of around 80:1. Canola stubble C:N ratios are higher and legume stubbles are lower. As stubbles break […]

Use paddock test strips to get the most out of your fertiliser budget

Paddock nutrient test strips showed two nutrient deficiencies in Justin Wundke’s barley crop. Justin and family run a cropping and prime sheep enterprise in South Australia. Before sowing last year’s crop Justin knew his paddock could have an issue with sulfur deficiency. Justin set up some test strips in his paddock […]

Get the best nitrogen benefit from legume rotations

Legumes grown under ideal conditions can add 30 to 120 kilograms of nitrogen per hectare, per year, back into the soil for use by other crops. The benefit of legume rotations to the following crops comes when the nitrogen-rich legume residue has decomposed and released nitrogen into the soil. Wheat […]

Crop nutrition field day provides local solutions

Researchers, agronomists and leading grain growers came together in July and August for a series of successful on-farm workshops presented by the More Profit from Crop Nutrition II (MPCN II) project. Findings from recent soil and plant nutrition research were outlined by crop nutrition and agronomy researchers, followed by in-depth […]