Effects of Crop-animal Co-cultivation Modes on Soil Nutrients and Rice Yield of Double-cropping Rice
To study the effects of crop-animal co-cultivation modes on soil nutrients and rice yield of double-cropping rice,three modes of treatment(rice-duck,rice-fish,and rice-loach)were set up,and the monoculture mode of rice was used as the control.Two rice varieties were selected in each season,including the early rice varieties of conventional rice Zhongzao 35 and hybrid rice Luliangyou 996,and the late rice varieties of conventional rice Zhongzao 39 and hybrid rice Shenyou 5438.The effects of different treatments on soil nutrient content,rice biomass and yield were studied in the field experiment of double-cropping rice.The results showed that compared with rice monoculture,rice-duck and rice-loach treatments could significantly increase soil organic carbon content in early and late rice seasons.Rice-duck and rice-fish treatments could significantly increase the content of soil alkali-hydrolyzable nitrogen in the maturity stage of late rice season.Rice-duck and rice-loach treatments could significantly increase the content of available soil phosphorus in the maturity stage of late rice season.Rice-fish treatment could significantly increase the aboveground biomass of early and late hybrid rice at maturity stage.Rice-loach treatment could significantly increase the yield of late hybrid rice Shenyou 5438(18.0％higher than that of CK).Rice-duck treatment could significantly increase the aboveground biomass at maturity stage and the yield of late rice(Zhongzao 39 and Shenyou 5438 increased by 11.1％and 19.1％,respectively,compared with CK).In summary,rice-duck treatment could significantly increase the soil organic carbon content at the maturity stage of double-cropping early and late rice,and the soil alkali-hydrolyzable nitrogen,available phosphorus content,the aboveground biomass at the maturity stage and yield of double-cropping late rice,therefore,rice-duck co-cultivation mode is suitable for application in double-cropping rice areas.
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