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 […]
Topic: nitrogen use effciency
Crop residues influence the supply and uptake of nitrogen (N). In the long term, residues will improve soil fertility. Stubbles can immobilise soil N as they break down. Moisture makes a big difference to the rate of stubble decomposition and mineralisation of nitrogen in the soil.
Nathan Craig was involved […]
Applying nitrogen late in the crop’s development (after GS60) can boost the protein level in the grain, but when is it likely to be economic to do so?
When leaf symptoms or comparison with an N-rich strip in the paddock indicate the crop really needs more N.
When N can be supplied […]
Topdressing decisions have to be made or revised, as the season progresses. The best nutrient use efficiency is achieved when nutrient supply matches crop demand. Splitting N applications through the season can better match crop demand than applying all N upfront, and allows some of the expense to be deferred […]
Getting the timing right for topdressed N fertiliser to best match crop demand is more important for N use efficiency than choosing the right N fertiliser form.
Field experiments generally show that granular urea, urea solutions and UAN perform equally well in supplying N when used in-crop. The most common […]
A crop’s nitrogen (N) requirement rises when rainfall increases the yield potential. Applying more N fertiliser to meet greater plant N demand is often appropriate, but crop uptake is not guaranteed. Understanding why can help tailor topdressing practices to increase the chances of the applied N boosting crop yield and […]