And study the nitrogenous fertilizer response trial, phosphorous fertilizer response trial, potassium fertilizer response trial and nitrogen, phosphorous, potassium nutrition balance separately.
分别从氮肥效应试验、磷肥效应试验、钾肥效应试验和氮磷钾养分平衡进行了研究。
Recent New Zealand research measured major nutrients in farm dairy effluent over a lactation to be about 5 kilograms nitrogen, 1 kilogram phosphorous and 4.5 kilograms potassium for each cow.
最近，新西兰的一项研究发现，奶牛的排泄物中含有重要的营养物，每头奶牛一个哺乳期所产生的排泄物中约含5千克氮， 1千克磷和4.5千克钾。
In cases where sewage sludge is used, expensive chemical fertilizer use can be avoided, he said. The sludge contains the same critical nutrients-nitrogen, phosphorous, and potassium.
有时候，人们用下水道污泥来代替昂贵的化学肥料，其中一样含有重要的营养成分——氮，磷和钾。
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