山东省自1981年以来坚持推广果园大面积铺草技术,变清耕制为覆草制,收到了良好的经济、社会和生态效益。1987年全省覆草推广面积达100万亩。实践证明,果园覆草有以下优点: 1.提高土壤肥力据牟平、莒县、五莲等地试验,果园年亩铺草1250～1500kg(麦草、玉米 Since 1981, Shandong Province has insisted on popularizing large-scale grass-planting technology in orchards and has turned clear cultivated land into grass-covered grass and has received good economic, social and ecological benefits. In 1987 the province covered grass to promote an area of ​​1000000 mus. Practice has proved that orchard mulching has the following advantages: 1. To improve soil fertility According to Muping, Lixian, Wulian and other places to test, orchard 12 acres of grass in 1500 ~ 1500kg (wheat straw, corn