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Title:: Studies on the Effect of Chemical Ripeners on the Characteristics for Mechanized Harvesting of Relay Cropping Soybean

Author(s):: SHU Kai; MENG Yong-jie; MEI Lin-sen; LIU Wei-guo; LIU Chun-yan; YANG Feng; YONG Tai-wen; YANG Wen-yu; College of Agronomy, Sichuan Agricultural University/ Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Chengdu 611130, China

Keywords:: Soybean; Relay cropping; Chemical ripening; Characteristics

PACS:: S565.1

DOI:: 10.11861/j.issn.1000-9841.2015.02.0264

Abstract:: ‘MaizeSoybean’ strip intercropping system is prevailing especially in Southwest China since 2000.Mechanized harvesting of relay cropping soybean is essential for further development of this system. In the present of study, shade-insensitive soybean cultivar ND 12 (Nandou 12) was employed under the “MaizeSoybean” strip intercropping system.The effect of three chemical ripeners including ethephon, diquat and paraquat, on the characteristics for mechanized harvesting of soybean were investigated during R7 stages, and consequently, these results provided the theory and technical basis for mechanized harvesting of relay soybean.The results revealed that, three kinds of chemical ripeners promoted leaves abscission, organs dehydration and aging with varying degrees, which created the favorable conditions for the mechanized harvesting of relay cropping soybean.Compared with the control, ethephon significantly promoted leaves abscission, and not negatively affect the 100-grain weight and the weight per seed, but the dehydration rate was low; paraquat took the second place. Regard to the dehydration rate, diquat possesses the obvious effect.After 9 days spraying, the water content in grains reduced to the level which fit for mechanized harvesting, and this data is ahead of 9 days compared to CK. However, diquat remarkably decreased the 100-grain weight and the weight per seed. Furthermore, our results demonstrated that these three kinds of chemical ripeners had no significant negative effect on soybean seed oil concentration, protein amount and the natural shedding. Therefore, in the relay cropping system, the diverse chemical ripeners ought to employ according to the different conditions, which ensure the smoothly of mechanized harvesting.

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Studies on the Effect of Chemical Ripeners on the Characteristics for Mechanized Harvesting of Relay Cropping Soybean(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

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