萧山县义蓬区位于钱塘江南岸。当地新围海涂多先辟为水稻田,引入淡水洗盐,春夏种植连作稻,冬季种植较耐盐的油菜。实践证明,用这种耕作方法,可以加速土壤脱盐,使新围海涂能及早投入农业生产。可是由于新围海涂土壤缺乏有机质,又为粉砂壤土质地,肥力较差又容易汀实;加之扩大围垦以后,土地面积增大,肥料和劳力都很紧张。因此,连年种植连作稻,产量很难提高。根据这几年的生产实践,将部分春花连作稻改成油菜——春大豆——晚稻,不但发展了大豆生产,而且可以缓和涂区连作稻耕作制的肥水、季节、劳力等矛盾,从而可促进全年增产。近年来,垦区种植春大豆面积逐年扩大。已由1975年的1532亩扩大到1978年的19044亩。1.海涂新垦稻田扩种大豆的好处(1)大豆产量高,全年产量也高。垦区大豆结荚紧密,结实率和百粒重高,没有 Xiaoshan County Yipu District is located in Qiantang River south bank. Xinduihai new local pioneer rice paddies, the introduction of fresh water wash salt, planting rice in spring and summer, planting salt-tolerant rape in winter. Practice has proved that with this tillage method, soil desalination can be accelerated so that the new Wai Tung can be put into agriculture as soon as possible. However, because of the lack of organic matter in the seabed in the San Wai, silt loam soil is also poor in fertility and easy to be solidified. In addition, after the expansion of the reclamation area, the land area is increased and the manure and labor are very tense. Therefore, successive years of continuous cropping rice, the yield is difficult to increase. According to the past few years of production practice, part of the Chunhua into rice into rape - spring soybeans - late rice, not only the development of soybean production, but also to ease the coating area continuous cropping system of fertilizer, seasonal, labor and other conflicts, which can Promote annual production. In recent years, reclamation area to expand spring soybean year by year. It has been expanded from 1532 mu in 1975 to 19044 mu in 1978. 1. Tachai newly reclaimed rice paddy expansion benefits (1) high yield soybean, the annual output is also high. Reclamation soybean pods close, seed rate and 100 high, no