Benefit analysis and comprehensive evaluation of rice-fish-duck symbiotic mode1
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Abstract
Three years’study demonstrated that rice-fish-duck symbiotic model can improve rice production by over 10%,meanwhile produce more than 1036.5kg/hm2 of fish and 238.9~489.3kg/hm2 of adult duck.Total N,P,K and soil organic matter contents of paddy field are increased by 27.9%,44.3%,6.5% and 28.2% respectively.The number of insect pests is decreased .The symbiotic system largely increased the output and economic benefit.An ecological index (EI)of 0.8155 suggested that it was a high efficient and comprehensive eco-agriculture mode1.
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