![]() For example where 30 kg N/ha is applied and an additional 300 kg DM/ha of pasture is grown the response rate is 10 kg DM/kg N fertiliser applied. The amount of pasture grown in kg DM per kg N/ha applied is the ‘response rate’. What influences the response rate to nitrogen? Feed budgeting and monitoring of actual pasture cover against target cover will help ensure N is applied early enough to fill a feed deficit. Therefore, N needs to either be applied to fill genuine feed deficits, or any surplus feed needs to be identified and harvested to make quality supplement.Īs the response to N occurs over 3-14 weeks (refer to table below) N should be applied in anticipation of a feed deficit. The profitability of applying N is dependent on the extra feed grown (the response) being utilised for animal production. Occasionally this ratio results in milk revenue insufficient to pay for the cost of N. The ratio of milk price to the cost of N fertiliser.soil temperature more than 6 o C and less than 16 o C). Soil Conditions – temperature and moisture (i.e.The need for extra pasture growth and how well the additional pasture can be used.It is best not to apply more than 50 kg N/ha at any one application and the need for application should be assessed against Applying N fertiliser is best when other factors are not limiting pasture growth and it is economically sound to do so based on the cost of growing and harvesting the extra pasture relative to milk price. ![]()
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