关键词: 氮磷钾, 超级稻, 吸收和转运, 施肥

Abstract: Mechanisms of dry matter and nutrient accumulation／transport in super rice(Liangyoupeijiu)planted under different levels of NPK supply were studied．The results showed that：(1)The maximal value of dry matter accum ulation in
super rice emerged in the midge growth phase，which was approximately 50％ of the total content．Nitrogen(N)supply was positively correlated with the accumulation of dry matter with R value of 0．8554，however phosphorus(P)and potassium (K) supply had minor effect．(2)Accumulation of N，P and K in super rice had diferent characteristics．Accumulation of N and P increased with supe r rice growing；an d accumulation of K showed a single—peak curve in the whole growing period．Most of N (85．4％) was accumulated in the early and middle growing stages．Both P and K accumulation reached their maximal levels of 58．0％ and 64．6％ in the middle growth phase．Nutrient accumulation was positively correlated withthe supply ofN，P and K．N and K supply can significantly afected themselves accumulation levels，but the effects of P supply and interaction of N，P and K on nutrient accumulation were not significant．(3)In seeds of super rice，values of accumulated N，P and K contents were 99.2 kg／hm 2，53.2 kg／hm 2 and 23.8 kg／hm 2，respectively．(ratio：4．2：2．2：1)，among which 75％ of N，70％ of P and 100％ of K carrie from vegetative mass．Significant negative correlation between N transport rate in vegetative n and N supply level was observed with R value of 0．9610，while efects of P and K were not significant．Increasing P supply level can enhance P transport rate，and the effect of N on P transport rate showed a single-peak curve．With increasing of K supply，transport rate and lose-rate of K elevated ．Effect of N on K transport rate also showed a single-peak curve，which suggested that too high or too low N supply could negatively affect the accumulation of P and K．

Key words: NPK, super rice, absorption andtransfer, fertilization