Field experiment was conducted with three nitrogen(N)rates(225,180 and 90 kg/ha,named as HN,MN and LN,respectively)and four foliar spray stages of zinc(Zn)(no Zn,spraying Zn of 4.5 kg/ha according to 1∶1 at seedling stage and jointing stage,spraying Zn of 4.5 kg/ha according to 1∶1 at jointing stage and flare opening stage,and spraying Zn of 4.5 kg/ha at flare opening stage,named as Zn0,Zn1,Zn2 and Zn3,respectively).The effect of N and Zn combined application on the absorption and transport of N and Zn in the grain of summer maize was studied at filling stage with ZD958 and GSY66 as materials,so as to provide the basis for fertilization of N and Zn in the production.The result showed that the N and Zn concentrations in grain generally decreased with the growth of plant.At mature stage,GSY66 of MNZn2 treatment had the highest N concentration in grain with 14.64 g/kg,while ZD958 of MNZn2 treatment had the highest N accumulation.GSY66 of MNZn3 treatment had higher Zn concentration and accumulation in grain.MN treatment had the highest N absorption and its contribution rate after anthesis with 50.42 kg/ha and 44.20%respectively,and the highest Zn transport amount with 61.68 g/ha;Zn2 treatment had the highest N absorption and its contribution rate after anthesis with 54.56 kg/ha and 44.31%respectively,and the highest contribution rate of Zn transport amount with 17.26%;under the above two treatments,the grain number per ear,1 000-grain weight and yield were higher.There was significantly or extremely significantly negative correlation between N transport amount and absorption after anthesis of N and Zn.There was significantly or extremely significantly positive correlation between Zn absorption after anthesis and the concentrations of N and Zn in grain and N absorption after anthesis.To sum up,N application rate of 180 kg/ha and spraying Zn of 4.5 kg/ha according to 1∶1 at jointing stage and flare opening stage can promote the absorption and transport of N and Zn at filling stage,increase the concentrations of N and Zn in grain,maintain the high yield,and realize synchronously increase of grain yield and Zn nutrition in the summer maize production.
Summer maizeNitrogen and Zinc combined applicationFilling stageNitrogenZincAbsorptionTransport
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