applied N and p fertilizer rationally

mixture application of N and P fertilizer

n-p-n-p structure

p n p n junction

p n p n junction p n p n

p n p n transistor

p n p n transistor p n p n

p-n-p-n transistor p-n-p-n

section n-n n-n

section p-p p-p

availability of N and P

available N and P

biological N and P removal

Coupling of irrigation and N fertilizer

diagnosis of N and P limitation

Dissolve N and P

distribution of N and P in above-ground plants

effect of N and P

Effect of N、P and K