关键词: 稻鸭共生, 鸭品种, 土壤养分, 水稻, 产量, 经济效益

Abstract: The effects of teal（SY），muscovy duck（YY） and mallard（LTY） on soil physical and chemical properties，rice yield and economic benefit of rice‐duck symbiosis system were studied using conventional rice monoculture as control（CK），so as to provide a theoretical basis for duck species selection and mode optimization in rice‐duck symbiosis system.The results showed that compared with CK，the total nitrogen，total phosphorus，total potassium，alkali‐hydrolyzable nitrogen and available phosphorus contents of soil generally decreased，available potassium content and pH value increased，but organic matter content did not have significant differences under the three rice‐duck symbiosis treatments.The effective panicles number，seed‐setting rate and yields of YY and LTY treatments significantly increased，while the total grains number per panicle significantly decreased.The effective panicles number，seed‐setting rate and yield of SY treatment increased，but the difference was not significant.The economic benefits of the three rice‐duck symbiotic treatments all improved，and the order was YY>LTY>SY>CK.In conclusion，rice‐duck symbiosis promoted the absorption of soil nutrients by rice，improved soil acidification，increased rice yield and economic benefit，and YY treatment was the best，followed by LTY treatment.

Key words: Rice‐duck symbiosis, Duck variety, Soil nutrient, Rice, Yield, Economic benefit