坡地上时针式喷灌系统浇灌农作物的减产是由于喷水压力不同、不能均匀供水所造成的。土地高的地方,大量的水要产生表面径流,引起水土流失,而较低部分则积水过量。田地坡度、土壤种类、植物对水的需要量及植物对不均匀供水、供肥的敏感性等均能影响其产量。 The reduction of production of irrigated crops by the hourglass sprinkler system on the slope is caused by the different water pressure and the inability to supply water evenly. Where land is high, large amounts of water produce surface runoff, causing soil erosion, while lower parts have excess water. The slope of the field, the type of soil, the plant’s need for water and the uneven supply of water to plants, the sensitivity to fertilizers, etc. can all affect their yields.