美国内布拉斯加洲大学的论文提出了赞成与反对时针式喷灌机的论点。时针式喷灌机的优点为: 1.与地面灌溉比,减少90％劳动量;和其它喷灌方式比,也减少25～75％的劳动量。 2.土地平整工作量最小。 3.灌溉管理简化。一个人能管理8～12台时针式机组,相当管理6千至1万2千亩土地。 4.在灌水时间与每次灌水量上均具有很大灵活性。 The thesis of the University of Nebraska in the United States put forward the arguments of favoring and opposing the hourglass irrigation machine. The advantages of the hourglass sprinkler are as follows: 1. Compared with the surface irrigation, the amount of labor reduced by 90%; and 25% -75% reduction compared with other sprinkling methods. 2 the least amount of land formation. 3. Simplify irrigation management. One person can manage 8 to 12 hourglass units and manage 6 to 12,000 mu of land. 4. In the irrigation time and irrigation volume each have great flexibility.