Effects of Sowing Date and Density of Fresh Maize on Yield Under Soybean and Fresh Maize Intercropping
In order to explore the suitable planting mode of soybean and fresh maize intercropping system in Huang-huai-hai region,this experiment used the two-factor split plot design of sowing date and density of fresh maize to study the effects of different fresh maize populations on crop yield,agronomic traits and relative competitiveness of crops.The results showed that 9 treatments of 3 sowing dates A1(June 30),A2(July 7),A3(July 14)and 3 densities B1(32 000 plants·ha-1),B2(38 000 plants·ha-),B3(45 000 plants·ha-1)did not affect the yield advantage of intercropping,and the land equivalent ratio(LER)was all greater than 1.For main factor sowing date,the mean LER value of A1,A2 and A3 was 1.26,1.20 and 1.15,respectively,with significant differences(P＜0.05),while the difference between A1 and A2 was not significant.Under different densities in the same sowing period,the LER of B2(38 000 plants·ha-1)was the largest,B3(45 000 plants·ha-1)was the middle,and B1(32 000 plants·ha-1)was the smallest.Sowing date and density of fresh maize had no significant effects on yield and 100-seed weight of soybean,but had significant effects on plant height,stem diameter,pods number per plant and seeds number per plant.The yield and 100-grain weight of fresh food maize decreased gradually with the delay of sowing date.The 100-grain weight of A3 was only 69.1％of that of A1,and the 100-grain weight of A3 decreased gradually with the increase of density in the same sowing period.The delayed sowing date of fresh maize inhibited the recovery of the resource competitiveness of fresh maize in the late stage of soybean and fresh maize symbiosis,and the resource competitiveness of fresh maize in the early stage of symbiosis became stronger gradually.Therefore,in terms of this study,when the fresh maize in the soybean and fresh maize intercropping system was sown no later than July 7,and the planting density was 38 000 plants·ha-1,the crop yield in the soybean and fresh maize intercropping system reached the best combination.
soybean and fresh maize intercroppingsowing time of fresh maizedensityyield
万方数据
维普
