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Catalogue: GRDC Updates (West)
Higher prices for both fertiliser and grain mean that fertiliser needs to be better targeted and used more efficiently because of the increased risks of losses both at the over- and under-fertilising ends of the spectrum... The key requirements for making better fertiliser recommendations are realistic estimates of potential yield (A), knowledge of the maximum yield response to fertiliser input for a give nutrient status of the soil (B) and estimates of nutrient use efficiency or the curvature of the response curve (C)... Yield response of ryegrass to applied N is considered to be linear between applications of 0 3 00 kg N ha -1(Whitehead 1995), it was appropriate to consider the linear response to N applied in the biosolids and urea...
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