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。
And study the nitrogenous fertilizer response trial, phosphorous fertilizer response trial, potassium fertilizer response trial and nitrogen, phosphorous, potassium nutrition balance separately.
与1999年试验结果相比，2000年的各种氮效率都小于1999年，说明干旱年份氮肥效果不突出，甚至产生一定的负效应。
Diversified nitrogen efficiency is lower in 2000 than in 1999, which show that nitrogen effectiveness is not manifest, even with negative effectiveness.
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