Effect of Nitrogen and Zinc Combined Application on Absorption and Transport of Nitrogen and Zinc in Summer Maize Grain at Filling Stage
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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