Applying fertilisers containing nitrogen and sulphur means the grass uses nitrogen more effectively, you get more kgs of dry matter per kg of nitrogen that you apply
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Dry conditions prevail over large parts of the country and many livestock farmers are in desperate need of rain to relieve grass shortages. The recovery time of swards following rain will depend on the severity of drought - the longer the drought, the longer the recovery.
Farmers will be looking to fertilise swards to maximise growth when the rain arrives, to feed grazing livestock and build silage reserves which are worryingly low on many farms. Don’t be tempted to spread fertiliser before forecasted rain. Heavy rain combined with dry and hard field surfaces is ideal for fertiliser run-off. Best to leave applications until after the initial rain.
If nitrogen (N) fertiliser has been applied over the last couple of weeks when grass growth has been well below average, then a portion of this N will still be present for the grass to utilise when a decent amount of rain arrives. How much, depends on when it was applied and the level of grass growth in the meantime. Rapid mineralisation of organic matter by soil microbes will also add to the plant available N pool following a rewetting of the soil.
When the rain arrives, reduce the target N rate for fertilising silage crops where a very light crop of grass has been harvested, by 30% to take account of N carryover from the previous fertilisation. If silage crops were fertilised within the last three weeks, then there is no requirement to reapply N. Typical fertiliser application rates of 230 – 320 kg/ha of YaraMila Sulphur Cut will be required for silage swards once soil moisture levels rise.
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