采用砂培试验和电子显微技术，研究了不同水平氮锌配施对白三叶草根瘤发育和超显微结构的影响。
Sand culture experiment, electron microscopy technique were used to investigate the compound effects of nitrogen and zinc on nodule development and ultrastructure of white clover.
在本试验条件下，麦茬水稻免耕技术适宜于不同施氮水平和施肥方法采用。
The ploughing-free technology was suitable for different methods of applying fertilizer and levels of applying nitrogen.
利用盆栽试验和15n示踪技术，研究了不同施氮量对两个花生品种氮素积累来源和产量的影响。
Effects of nitrogen application amounts on source of nitrogen accumulation and yields of two peanut cultivars were studied by using the method of pot culture and 15n tracer.
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