水田犁耕以后,在耕作层下面形成透水性差的犁底层,使得排水条件恶化。近几年来,为了提高收获量,采用复种、水旱轮作、水稻旱直播、稻草还田等措施,都要求在一定时期迅速排水。另一方面,农业机械在水分多的田间作业行走困难,作业质量降低,也要求短时期内迅速排水。 After plowing the paddy field, a poorly permeable plow base was formed beneath the tillage layer, deteriorating drainage conditions. In recent years, in order to increase harvest, the use of multiple cropping, rotation and drought, rice dry broadcast, straw and other measures require rapid drainage in a certain period of time. On the other hand, agricultural machinery in the field of water and more difficult to walk, reduce the quality of operations, but also requires rapid drainage within a short period of time.