氮锌配施对不同锌效率玉米品种植株矿质元素累积、分配的影响OA北大核心CSTPCD

With Zhengdan 958(ZD958)with high zinc(Zn)efficiency and Longping 638(LP638)with Zn insensitivity as materials,the field plot experiment was conducted with three nitrogen(N)rates[90 kg/ha(LN),180 kg/ha(MN)and 225 kg/ha(HN)]and two foliar Zn treatments[no Zn(F0),spraying Zn of 1∶1 at jointing stage and flare opening stage(F1)]to analyze the effects of N and Zn application on content,accumulation and distribution of mineral elements in plant and grain yield of maize,so as to provide reference for N and Zn application in the maize production.The results showed that the highest copper(Cu)and Zn content in grain was found under MN treatment,with 1.82 mg/kg and 16.23 mg/kg,respectively.F1 treatment could increase the contents of N and Zn and Zn availability.The accumulation of N,phosphorus(P)and potassium(K)in plant was the highest in LP638 under MNF1 treatment;The highest accumulation of Cu and Zn was found in ZD958 under LNF1 treatment,while the highest accumulation of manganese(Mn)and iron(Fe)under HNF1 treatment.The highest proportion of N,P and Cu in grain was obtained in LP638 under HNF1 treatment;The higher proportion of Zn was found in ZD958 under HNF0 and LNF0 treatments.HN treatment had the highest grain yield with an average of 10.31 t/ha,followed by MN treatment,and LN treatment was the lowest.There was significantly positive correlation between P content and Mn content in grain of two varieties;K content was significantly positively correlated with Fe content and Zn content,but significantly negatively correlated with Cu content in LP638.To sum up,180 kg/ha N and spraying Zn of 1∶1 at jointing stage and flare opening stage can increase Zn availability and accumulation of mineral elements in maize grain,promote the synchronous improvement of yield and mineral nutrition,and can be promoted in maize field production.