果园覆草是一种新的栽培措施,具有抑制杂草生长、增加土壤有机质,减少水分蒸发等优点。据调查覆草后可增产15%~20%。长期覆草,还能改善土壤团粒结构,增加土壤有机质含量,提高土壤肥力。氮素对苹果树的生长发育有着非常重要的作用。在苹果的生长发育过程中,氮素一直被认为是一种重要的养分。氮素对营养生长、开花、坐果、产量形成、质量和采后生理的 Orchard mulching is a new cultivation measures, with inhibition of weed growth, increase soil organic matter, reduce the evaporation of water and so on. According to the survey mulching can increase 15% to 20%. Long-term grass cover, but also improve soil aggregate structure, increase soil organic matter content, improve soil fertility. Nitrogen has a very important role in the growth and development of apple trees. Nitrogen has long been considered an important nutrient in the growth and development of apples. Nitrogen on vegetative growth, flowering, fruit setting, yield formation, quality and post-harvest physiology