果园覆草有以下作用: 首先提高土壤肥力。科学家确认,果树所需的氮、磷、钾等16种元素,在作物秸秆和杂草中大量存在。草是全素肥料,1000公斤草腐烂后的肥力相当于3000公斤优质圈肥。土壤连续四年覆草15～20厘米,有机质含量提高3倍,有效氮、磷、钾含量分别提高4倍、3倍和8倍。 Orchard mulching has the following effects: First, increase soil fertility. The scientists confirmed that 16 elements of nitrogen, phosphorus and potassium needed by fruit trees are abundant in crop stalks and weeds. Grass is all-vegetarian fertilizer, 1000 kg of grass rotten fertility equivalent to 3000 kg high-quality circle fat. The soil was covered with grass for 15-20 cm for four consecutive years, the content of organic matter increased by 3 times, and the contents of available nitrogen, phosphorus and potassium increased by 4 times, 3 times and 8 times respectively.