论文部分内容阅读
通济堰位于川西平原西南部,灌溉新津、彭山、眉山、青神4个县43.9万亩农田,其中粘壤土占83％以上。在60年代以前,下湿田、冷浸田相当严重,其中5万多亩盐碱田威胁更大。从70年代初期开始,在改善水利条件的基础上,大力改一季作物为粮油或稻、麦两季作物,粮食生产有了发展。但由于某些改土培肥措施失当,带来耕作层变浅,犁底层增厚,土壤粘重板结,渗透性差,土壤持水能力强的恶果。一遇秋雨则田内积水,排不出去,群众称为“糖心蛋”。这种土
Tongji weir is located in the southwest of the western Sichuan Plain, irrigated Xinjin, Pengshan, Meishan, Qing Shen 4 counties 439000 acres of farmland, clay clay accounts for more than 83%. Before the 1960s, under wet fields, cold-dip fields were rather serious, of which more than 50,000 mu of saline-alkali fields were more threatening. Starting from the early 1970s, on the basis of improving water conservancy conditions, great efforts have been made to change the crop of one season into grain and oil or rice and wheat. The grain production has been developed. However, due to improper soil fertility improvement measures, some of the consequences of shallow soil plowing, thickening of plow bottom, thickening of soil compaction, poor permeability and strong soil water holding capacity are some of the problems. A fall in the field of stagnant water, row can not go out, the masses called “sweetheart.” This soil