有机物料配施对稻鸭共作土壤有机质及稻米品质的影响OA

Rice-duck farming has been widely applied in optimal intensive rice cropping production in southern China.To investigate the effects of combined application of organic materials on soil organic matter and rice quality under rice-duck farming system,three cultivation treatments were established with conventional chemical fertilization as the control:chemical fertilizer+ducks,biochar+chemical fertilizer+ducks,and green manure+biochar+chemical fertilizer+ducks.The study examined the impacts of combined application of organic materials on soil microbial biomass nitrogen,soil organic matter,rice yield,and rice quality.The results showed(1)the combined application of organic materials influenced the transformation of organic and inorganic nitrogen in rice-duck farming soils.Compared with the treatment without organic material,biochar and green manure+biochar significantly increased soil microbial biomass nitrogen in double-cropping rice fields,with early-season rice increasing by 51.73％and 35.02％,and late-season rice increasing by 30.67％and 50.35％.(2)The combined application of organic material promoted the accumulation of soil organic matter in rice-duck farming systems.Even without organic material addition,soil organic matter content under rice-duck farming was significantly higher than that under conventional fertilization,with increases of 3.47％in early-season rice and 8.11％in late-season rice.Treatments with organic materials further enhanced soil organic matter compared with chemical fertilizer alone,with biochar increasing by 80.05％and 55.75％in early-and late-season rice fields,respectively,with green manure+biochar increasing by 93.15％and 80.92％.(3)The combined application of organic material improved rice quality under rice-duck farming.Rice cooking quality of biochar and biochar+green manure treatments was superior compared with treatment without organic materials,both reaching the first-grade rice quality standard.The appearance quality of rice under all rice-duck farming treatments met the first-grade rice quality standard.The combined application of green manure or biochar in the rice-duck farming system is beneficial for optimizing intensive rice production in southern China.