Crops may source much of their nitrogen (N) from in-crop mineralisation (ICM) of soil organic matter. Of total crop N at harvest, an estimated average 63% came from ICM in a recent Victorian study. Total crop N includes grain, straw and roots. Root N is about 10% of grain and […]
Mid-row Banding (MRB) places nitrogen (N) fertiliser below the soil surface in every second crop inter-row. Recent research looked at using MRB for in-crop N applications. In-season N applications aim to meet a crop’s peak N demand and improve the efficiency of crop uptake. MRB can reduce some risks that […]
Many Australian grain paddocks have a nitrogen (N) deficit. Analysis by the IPNI of 2016 data collected from grain growers across the southern region found few growers were in N surplus. On average, at a paddock level 1.14 kg N is removed for each kilogram of N fertiliser applied. These calculations […]
Biserrula is proving a beneficial pasture legume for cereal crop rotations in Western Australia. This persistent annual legume can be used to rest and rehabilitate heavily cropped country, and to manage weeds. Used in pasture phases, it can leave plenty of nitrogen available for future crops, and eventually provides good grazing […]
Some significant global premiums are emerging for high protein wheat grades. These international prices are starting to flow through to domestic wheat prices. Prime hard wheat (standard is a minimum 13% protein) was recently quoted at a premium of $85/tonne over APW wheat (10.5% protein, 5% screenings, 12.5% moisture) in […]
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 per tonne of grain yield
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 […]
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 sorghum […]
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 Herridge, […]
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 […]