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Effects of Rape Residue as Green Manure on Rice Growth and Weed Suppression
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 Title & Authors
Effects of Rape Residue as Green Manure on Rice Growth and Weed Suppression
Choi, Bong-Su; Sung, Jwa-Kyung; Lee, Sang-Soo; Nam, Jae-Jak; Hong, Seung-Gil; Kim, Rog-Young; Yang, Jae-E.; Ok, Yong-Sik;
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Rape residue as green manure is an emerging alternative of chemical fertilizer to improve soil quality and crop productivity. Objective of this research was to evaluate the effectiveness of rape residue as green manure on reduction of chemical fertilizer and suppression of weed occurrence in rice-rape double cropping system. Greenhouse experiment was conducted with four treatments: the combination of rape residue and three different N application rates (0, 30 and 70% of recommended application rate (7.8 kg N )) and 100% chemical fertilizer as a control. No difference in rice clum length was observed for all treatments, while panicle length was highest in a treatment of rape residue+70% chemical fertilizer (Rape+70%CF). In addition, rice grain weight at a Rape+70%CF treatment increased by 19% compared to the control. This treatment also reduced weed density and biomass by 58 and 53%, respectively, compared to the control. Our results suggest that use of rape residues as green manure is an environment friendly and effective way to reduce chemical fertilizer and to enhance crop productivity in rice-rape double cropping system in Korea.
Green manure;Rape residue;Rice;Rice-rape double cropping;Weed control;
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