美国靠大西洋的广大西北地区,在许多农民用上了喷灌设备给作物进行灌溉中,发现那个地区有机质少的松散的粉砂壤土及粘土微粒在灌溉后表面地壳变干时会形成一层硬壳,极大地限制了水分渗透到土壤中去。所以,农民们不仅需要知道应该什么时候打开阀门、提供多少水量,还应该确保喷灌中每滴水的动能传递到土壤表面时不会让这些易碎的土壤板结。针对这种 In the vast northwestern region of the Atlantic, the United States used irrigation equipment to irrigate crops in many farmers. It found that loose loamy loamy soil and clay particles with little organic matter in the area formed a hard shell when the surface crust dried after irrigation , Greatly limiting the penetration of moisture into the soil. Therefore, farmers need to know not only when to open the valve and how much water they should provide, but also to ensure that the kinetic energy of each drip in the sprinkler is not transferred to the surface of the soil by the fragile soil. For this