Effects of Increased Planting Density and Reduced Nitrogen Application on Dry Matter Accumulation,Translocation,and Yield in Maize Strip Relay Intercropping
Three maize production areas was selected,including Pingchang,Lezhi and Renshou County.Set maize density A 1(45 000),A2(60 000),A3(75 000 plants/ha),and nitrogen rates were B1(180),B2(225),B3(270 kg/ha),the effects of different treatments on dry matter accumulation,distribution,transport and yield of zonal intercrop-ping maize were analyzed.Maize yield was significantly affected by ecological zone,density and nitrogen fertilizer.Renshou,Lazhi and Pingchang A3 increased their density by 11.66％,19.31％and 29.69％compared with A1.The yield of B1 was 1.18％,3.84％and 18.07％lower than that of B3.Yield of Renshou,Lezhi(A2B2)and Pingchang(A3B2)increased by 945.65,1 673.18 and 2 279.54 kg/ha compared with that of A1B3.The accumulation of dry matter increased during grouting and maturation.Renshou,Lezhi(A2B2),and Pingchang(A3B2)exhibited an in-crease in dry matter assimilation of 9.17％,23.94％,and 29.12％.In conclusion,Renshou,Lezhi increased densifi-cation by 30％,decreasing nitrogen by 15％,Pingchang increased densification by 60％,decreasing nitrogen by 15％,and promoted material accumulation to grain transport by increased dry matter accumulation,maximum accu-mulation rate and prolonging growth active period.
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