Effects of Maize and Different Field Configurationgs on the Yield and Benefits under Soybean and Maize Intercropping System in Hunan Province
In order to improve the production level of soybean and corn in Hunan,increase the output and income of grain per unit land area,and ensure the food security of our country.The maize variety Denghai 605 with compact plant type,Xianghuiyu No.1 with semi-compact plant type,Zhengda 999 with flat plant type and soybean variety Xiangchun 2704 were used as experimental materials,the yield and economic benefits of three banded compound planting patterns with different row ratios of corn and soybean(2∶4,2∶3,4∶6)were compared.The results showed that the type of maize varieties signifi-cantly affected the plant height,lodging rate and yield of intercropping maize.The average plant height of compact,semi-compact and flat corn was 2.63,2.76,2.87 m respectively;the average lodging rate was 1.51%,1.91%and 12.5%respec-tively;and the average yield was 8 194.5,8 137.9 and 7 125.1 kg/hm2 respectively.The row ratio of corn to soybean sig-nificantly affected the yield,lodging rate and discount rate of maize in multi-cropping system.The yield of corn with2∶4 and 2∶3 row ratio of corn to soybean was significantly higher than that of 4∶6 model.The soybean yield of compact and semi-compact corn combined cropping mode was significantly higher than that of flat corn compound cropping mode,and the av-erage yield of soybean under 2∶4 row ratio mode was significantly higher than that of the other two row ratio patterns.The comprehensive benefit order of different maize-soybean row ratio models was 2∶4>2∶3>4∶6>monoculture mode.According to the comprehensive analysis,compact and semi-compact corn varieties should be selected,and the row ratio of corn to soybean should be set as 2∶4 in the belt compound planting of soybean and corn in Shaoyang area.
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