盐碱地区,冬小麦的播前灌溉,对于土壤盐分变化和保苗增产的关系很大,值得探讨。目前,一般采用的播前灌方法,基本上不是沟灌,便是畦灌。在非盐碱地区,播前沟灌有许多优点,所以这种方法在军垦农场迅速推广。但盐碱地区,能否因袭采用这种方法呢? 从沟灌本身说,它的优点在于:省水、灌后土壤疏松、水份渗透均匀,不平或粘重的土地浇水也易于掌握,更适合于机械作业。但不能很好地降低土表盐分,灌后常引起盐分水平位置分布不匀,盐重的地段影响出苗,有缺苗、死苗现象,要求耕作次数多,亩成本也高。 Saline-alkali areas, winter wheat pre-sowing irrigation, the relationship between soil salinization and seedling yield increase is worth discussing. At present, the general method used before sowing irrigation is basically not furrow irrigation, that is, irrigation. In non-saline areas, sowing before ditch has many advantages, so this method quickly promoted in the Ken farm. However, salt and alkali areas, can adopt this method because of attack? From furrow irrigation itself, its advantages are: water, irrigation after the soil loose, uniform water infiltration, uneven or sticky land watering is also easy to grasp, more suitable In mechanical work. However, salt content in soil surface can not be well reduced. Irrigation often results in uneven distribution of salt levels. The heavy salt fields affect the emergence of seedlings. There are no seedlings and dead seedlings, requiring more farming times and higher mu costs.