Effect of N Application Methods on Nitrogenase,Photosynthesis and Yield of Soybean under Maize-Soybean Relay Strip Intercropping System

To investigate the effect of N application methods on soybean nodule nitrogenase,dry matter accumulation,photosynthetic traits and seed yield,a field experiment was conducted with different N application methods,such as collaboration fertilization of maize and soybean with diversity distance of fertilization to narrow row maize,and fertilizing in soybean holes. Compared to no N treatment,applying N significantly promoted nodule growth and shoot dry weight accumulation,nitrogen-fixing ability of nodules,photosynthesis and seed yield of soybean. Collaboration fertilization significantly enhanced root and nodule dry weight,nitrogen-fixing potential,shoot dry weight,net photosynthetic rate and seed yield. Among which the crops yield was the highest when the distance between the fertilization dot and the narrow row maize was from 15 to 30 centimeters. When the distance was 30 centimeters,nitrogen-fixing potential at R2,net photosynthetic rate,soybean seed yield and the annual total production of maize and soybean increased by 29. 26%,7. 43%,23. 88% and 6. 4%,respectively,compared with fertilizing in soybean holes.