Effect of Nitrogen and Zinc Application on Filling Characteristics of Grains at Different Positions of Maize Ear
The high Zn efficiency variety Zhengdan 958(ZD958)and Zn no-sensitive variety Longping 638(LP638)were used as materials.The field plot experiment was conducted with three N rates[225 kg/ha(HN),180 kg/ha(MN)and 90 kg/ha(LN)]and two foliar Zn treatments[no Zn(F0),spraying Zn of 1∶1 at jointing stage and flare opening stage(F1)],and the effects of N and Zn application on the filling characteristics of grains at different positions and their relationship with grain yield of different Zn efficiency varieties were studied,so as to provide reference for N and Zn application in the maize production.The results showed that HN treatment had the highest yield,followed by MN treatment,and there was no significant difference between HN treatment and MN treatment.HN treatment increased grain weight at different positions.MN treatment delayed the time with the maximum grain-filling rate(TGmax)at different positions,and increased the maximum grain-filling rate(Gmax)at upper position and active grain-filling period(D)at basal position of ZD958 ear,while HN treatment delayed TGmax,prolonged D of different positions,and enhanced the grain weight with the maximum grain-filling rate(WGmax)at upper and basal positions of LP638 ear,thus increasing grain yield.Compared with F0 treatment,F1 treatment significantly decreased the bare tip length by 9.9%,significantly increased the yield by 2.0%,increased the grain weight,extended D and postponed TGmax at upper and basal positions of ZD958 ear,and increased WGmax.The grain yield was significantly positively correlated with TGmax at basal position of ear,and the grain weight at middle position of ear was extremely significantly positively correlated with the grain weight at basal position of ear.To sum up,applying 180 kg/ha N and spraying 4.5 kg/ha Zn of 1∶1 at jointing stage and flare opening stage can delay TGmax at upper and basal positions of ear,extend D,and increase WGmax and grain weight of high Zn efficiency maize genotype,thus promoting the increase of yield.
MaizeNitrogen and zinc applicationGrain positionGrain filling characteristicsYield
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