一、主攻方向要明确上海郊区水稻育种是攻早稻、后季稻、还是单季晚稻?这要根据郊区粮食生产发展的需要来确定。目前,郊区粮食生产主要是一年三熟制,这一种植方式对于粮食生产曾具有一定的推动作用,但有的地方由于没有因地制宜,季节、劳力、用地养地等矛盾很突出,粮食产量徘徊不前,成本高,收入 First, the main direction should be clear that the suburbs of Shanghai rice breeding is to attack the early rice, the latter quarter of rice, or single season late rice? This should be based on the needs of suburban food production to determine. At present, the grain production in the suburbs is mainly composed of three crops a year. This planting method has had a certain impetus to grain production. However, in some places, due to the fact that there is no contradiction between the measures of local conditions, seasons, labor force and land use, the output of grain is hovering Not before, high cost, income