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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (6): 1077-1086.doi: 10.19802/j.issn.1007-9084.2020352

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Comparative study on the agronomic traits and yield of soybean varieties with different maturity in maize-soybean intercropping system

Jian-qiu LIANG(), Xiao-bo YU, Ze-min HE, Jian-gang AN, Jia WANG, Zhao-qiong ZENG, Wen-ying YANG, Hai-ying WU(), Ming-rong ZHANG()   

  1. Nanchong Institute of Agriculture Science, Nanchong 637000, China
  • Received:2020-12-09 Online:2021-12-22 Published:2021-12-23
  • Contact: Hai-ying WU,Ming-rong ZHANG E-mail:liangjianqiu142@163.com;470797370@qq.com;zhangminron@126.com

Abstract:

In order to provide theoretical basis for selecting soybean varieties suitable for intercropping, sixteen soybean varieties including early maturity (EM), medium maturity (MM) and late maturity type (LM) were used as experimental materials to compare the agronomic traits and yield components in “maize-soybean” relay strip intercropping with the control of sole cropping of soybean. The results showed that the plant height, average internode length and lodging rate of three types of soybean varieties in intercropping were significantly higher than those of control. The plant height, bottom pod height, node number, average internode length and lodging rate of EM were significantly lower than those of MM and LM. The number of effective branches of LM in intercropping was significantly higher than those of control, whereas EM and MM were not significant. The yields of three types in intercropping were significantly lower than those of control. The pod number per plant, seed number per plant, 100-seed weight and yield of EM were significantly lower than those of MM and LM, but the differences between MM and LM were not significant. In addition, the available pods rate of MM and LM in interplanting were significantly higher than those of control, the available pods rate of LM were significantly higher than those of MM and EM, meanwhile available pods rate of MM are significantly higher than EM. The full grain rate was no significant difference between intercropping and control, but the full grain rate of MM and LM were significantly higher than those of EM. Through correlation analysis, the lodging rate in intercropping condition was significantly positively related to high plant, nod number and average internode length; maturity was significantly positively related to the available pods rate, the yield per plant, full grain rate and yield. The SPMS/M (symbiotic phase of maize and soybean/maturity) was significantly negative related to the available pods rate, full grain rate and yield. These results concluded that the MM and LM soybean varieties have a longer period of light compensation and could obtain higher yields in intercroping than EM varieties, which are suitable soybean varieties for maize-soybean intercropping.

Key words: soybean, maturity type, intercroping, agronomic traits, lodging, yield

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