Acylated chitin

15N-labelled fertilizer

15N labelled nitrogen fertilizer

15N labelled fertilizer

15N labeled organic fertilizer

15N labeled fertilizer

15 N labeled fertilizer

’Lianweibao’organic inorganic fertilizer

’3414’fertilizer experiment

’3414’fertilizer efficiency experiment

’3414’ fertilizer effect experiment

~(15)N-straw fertilizer

~(15)N-rape cake fertilizer

~(15)N-labelled fertilizer

~(15)N labelled nitrogen fertilizer

~(15)N labelled fertilizer

~(15)N fertilizer

(organic-inorganic) complex fertilizer

(Mn+Zn)-LS trace fertilizer