AN EVALUATION ON CROPPING SYSTEMS AND THE STUDY ON COMBINED GRAIN WITH FORAGE CROPPING IN THE SUBURBS OF SHANGHAI
Wang Fang-tao;Liao Zhao-xiong;Wang Xiu-de, (Soil and Fertilizer Research Institute, Shanghai Academy of Agricultural Sciences)
Barley (rape or green manure) -rice -rice, Wheat-rice and Wheat-cotton. cropping systems have been practised for a long time in the suburbs of Shaghai. Recently a new cropping system, Combined grain with forage cropping designed, Was compared with those cropping systems. The results showed that combined grain with forage and barley-rice-rice cropping systems have much advantage than the others in ecological benefit (efficient of energy and matter discharge) Social effects economic efficient and soil improvement and so on. On the basis of cropping pattern with rice and wheat (or barley) as the main crops, We may adjust rate of barley-rice or wheat-rice cropping system; reduce area of cotton crop by degree; develop special economic crops suitably such as medicinal herbs and spice crops; extend combined grain with forage cropping system vigorously for promoting the development of animal husbandry; set up pluralistic and compound structure of agriculture and realize a good circulation of agricultural ecosystem in the suburbs of shanghai.