In nitratefertilizer sources, the contents of nitrogen and nitrate in maize were highest.
而以硝态氮肥为氮源时，玉米叶片硝态氮含量和全氮含量最高。
2
Field experiment was conducted on studying the affection on the yield of cabbage and the accumulation of nitrate by using different kinds of nitrogenfertilizer.
通过田间试验研究了不同形态氮肥对大白菜产量及硝酸盐累积的影响。
3
Fertilizernitrogen is one of the major sources of nitrate.