1·The effects of Cu on rice at same level of N fertilizer were studied.
本文研究了微量元素铜在同样的氮肥量水平下对水稻生育的影响。
2·Over-use N fertilizer may not only cause economic losses, but produce many environmental problems.
过量的施用氮肥，不仅造成大量的经济损失，更重要的是引起一系列环境问题。
3·The aftereffect of fertilization on the yield: N fertilizer had little effect on yield of alfalfa in the second year.
钾肥对第二年苜蓿还是有一定的作用，具有一定的后效。
4·The more developed the wheat roots were, the less leachate could be collected, thus, less loss of N fertilizer was observed.
小麦根系越发达，收集到的淋溶液越少，损失的肥料N越少。
5·Application of N fertilizer significantly increased the amount of residual nitrate-N, and affected its distribution in the soil profile.
施用氮肥可明显增加土壤硝态氮残留数量，并影响其剖面分布；
6·The influence of application of organic and nitrogen fertilizer on the content of alkali hydrolysable N in fertilities soil was studied.
对设施土壤中长期施有机肥与氮肥对土壤中碱解氮含量的影响进行了研究。
7·The effect of different N fertilizer forms on plant iron nutrition and the role of iron in plant N metabolism were studied under nutrient condition.
水培条件下研究了不同形态氮素对植物铁素营养的影响，以及铁对植物氮素代谢的影响。
8·To apply all the N fertilizer in jointing stage gave best results. The combined application of N and K can increase yield by 42.2%, and N only 25.9%.
另外，增产效果与氮肥施用时期有关，在拔节期一次施氮效果最好，氮钾配施增产42 ．2 ％ ，单施氮增产25 ．9 ％ 。
9·However, the contents of NH4 + -n in the Purplish clayey soil were significantly increased by water-logged incubation or by nitrogen fertilizer added.
而外加氮源或淹水处理对青紫泥nh4 + - N含量的提升作用则贯穿于培养试验的全过程。
10·The main results were as follows: there was a close relationship between the effect of Mo fertilizer application and N fertilizer levels, and Mo value.
结果表明：小麦施钼效果与施N水平和土壤钼值密切相关，而与土壤有效钼含量相关不显著。