治涝经济效益计算与分析分两个时段进行，1949～1990年及1990～2005年，采用两种不同的方法进行评价。
We compartmentalized two periods to calculate economic benefits and adopted two methods to analyze benefits in 1949~1990 and 1990~2005.
农业综合开发的重点是改造中低产田，对于低洼易涝地区是除涝治碱，健全排灌系统。
It is important for agricultural synthetic exploitation to improve the poor yield, do away with the flood and alkali of low and stagnant field and perfect the draining and irrigating system.
应用推荐