Analysis of ecological and environmental effects of coordination of farming and animal husbandry of “rice-ryegrass-goose”

According to the results of field experiments from 1997 to 1999,there is a significant control effect on winter weed after the coordination of farming and animal husbandry of rice-ryegrass-goose without any herbicide.The weed community density of winter-fallow-field afterrice/ryegrass just accounts for 8.88% of that afterrice/wheat in the second year.The weed community structure is also different,the percentages of Alopecurus aequalis Sobol.,Galium aparine linn.var.tenerum and Vicia sativa are 15.38%,30.77% and 30.77% respectively,monocotyledonous weed isn't the main weed in winter afterrice/ryegrass.At the same time,soil fertility has a big increase and the characteristics of soil chemical and physical are improved.Compared with the traditional pattern of rice/wheat,the content of total N,organic matter,effective N,effective P and effective K increase by 23.13%,27.10%,31.25%,98.37% and 46.73% respectively in the second year of rice/ryegrass-goose.Moreover,there is a big decrease of toxicant remaining because of the dosage decrease of herbicide and pesticide in the whole year.Finally,cropping and feeding technology for system coupling is summarized,and the development strategy is put forward in this paper.