Effects of Organic Fertilizer Substitution for Basal Chemical Nitrogen on Photosynthetic Performance,Yield,and Nitrogen Use Efficiency in Rainfed Maize
Under a controlled nitrogen application rate of 200 kg/ha,4 organic fertilizer substitute bases were set to apply fertilizer nitrogen ratio:100％fertilizer(T1),50％fertilizer+50％organic fertilizer(50％organic substitu-tion,T2),62.5％fertilizer+37.5％organic fertilizer(37.5％organic substitution,T3),and a treatment without nitro-gen application(T4).The regulation effect of different organic substitution ratio on rained maize yield and nitrogen use efficiency was studied.The results showed at the filling stage,the activities of ribo-1,5-diphosphate carboxyl-ase oxygenase(Rubisco),phosphoenolpyruvate carboxylase(PEPC)and pyruvate phosphate double kinase(PPDK)were increased by 22.3％,16.7％and 16.0％,respectively,compared with that of single fertilizer treatment.The grain yield and the nitrogen use efficiency under 37.5％organic substitute treatment was significantly increased compared with single fertilizer and 50％organic substitute treatment.In conclusion,under the nitrogen application level of 200 kg/ha,37.5％organic fertilizer substitution of basal chemical N fertilizer can improve the leaf area in-dex and photosynthetic key enzyme activities of rainfed maize at filling stage,and improve the nitrogen use efficien-cy while ensuring stable yield.
MaizeYieldPhotosynthetic physiological characteristicNitrogen use efficiency
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