applied N and p fertilizer rationally  合理施肥

mixture application of N and P fertilizer  氮磷配施

n-p-n-p structure  n-p-n-n结构

p n p n junction  p n p n 结

p n p n junction p n p n  结

p n p n transistor  P N P N 晶体管

p n p n transistor p n p n  晶体管

p-n-p-n transistor p-n-p-n  晶体管

section n-n n-n  剖面

section p-p p-p  剖面

availability of N and P  氮磷利用率

available N and P  有效氮、磷; 强脉冲离子束

biological N and P removal  脱氮除磷

Coupling of irrigation and N fertilizer  水氮耦合

diagnosis of N and P limitation  氮磷限制诊断

Dissolve N and P  溶解性氮磷

distribution of N and P in above-ground plants  氮、磷在植株内的分布

effect of N and P  氮磷肥效

Effect of N、P and K  氮磷钾效应