Effects of Nitrogen Application on Photosynthetic Rate,Dry Matter Accumulation after Anthesis and Yield of Zhengmai 366
Field experiments were conducted with the strong gluten wheat variety Zhengmai 366 for two consecutive years in order to analyze the effects of different nitrogen application methods on flag leaf SPAD,photosynthetic rate,dry matter accumulation after anthesis,and grain yield.Four nitrogen application treatments were set:no nitrogen treatment(No),basal nitrogen 210 kg/ha(N210),basal nitrogen 150 kg/ha+topdressing nitrogen 60 kg/ha at jointing stage(N150+60),basal nitrogen 150 kg/ha+topdressing nitrogen 120 kg/ha at jointing stage(N150+120).The result showed that compared with other nitrogen application treatments,the photosynthetic rate of flag leaf,SPAD at the filling stage,raito of grain dry matter at post-anthesis,1000-grain weight and final yield of No treatment decreased significantly in both 2018-2019 and 2019-2020.Compared with N210 treatment,SPAD at late filling stage,contribution rate of dry matter accumulation after anthesis to grain yield,1000-grain weight and yield of N150+60 treatment increased by 12.9％,9.7％,6.5％,1.6％in 2018-2019,and those were 16.3％,27.2％,6.3％,and 10.0％,respectively in 2019-2020.Compared with N1 50+120 treatment,N150+60 treatment significantly decreased SPAD at late filling stage,photosynthetic rate at filling stage in 2018-2019,but not significantly affect these physiological parameters of winter wheat at filling stage in 2019-2020.N150+60 treatment significantly increased the number of grains per spike and yield in 2018-2019,and N partial productivity in both two years when compared to N150+120.Considering photosynthetic rate,yield and nitrogen production efficiency,N1 50+60 treatment is a more suitable nitrogen application method for North Henan Plain.
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