在果园进行生草覆盖,不仅能增加土壤有机质的含量,减少水分蒸发和迳流,防止水土流失,还能抑制盐碱地返盐碱等,且操作简单。1.生草技术要点(1)选择适宜的生草方式。果园生草一般宜种多年生草,如禾本科的黑麦草,豆科的美国苜蓿,红、白三叶草,多变小冠花等。禾本科草长势旺,与果树争氮较激烈,但耐阴性强,产量高,在土壤中分解慢,残留量多;豆科作物则与之相反。因此宜采取两种作物混种。另外,苕子也可采用一种多年,自生自灭的生草方式。(2)及时割草。当草长到20～30厘米高时,要及时刈割。在果树肥水关键期,必须普遍割草。一般每年 Grass planting in the orchard can not only increase the content of soil organic matter, reduce the evaporation of water and pouring water, prevent soil erosion, but also restrain the salinization of saline soil and so on, and the operation is simple. 1 raw grass technical points (1) choose the appropriate way of raw grass. Orchard grass is generally appropriate to species perennial grass, such as grass ryegrass, leguminous alfalfa, red and white clover, changing small crown flowers. Gramineae grass growing vigorously, nitrogen and fierce competition with fruit trees, but strong negative resistance, high yield, slow decomposition in the soil, residues and more; leguminous crops are the opposite. Therefore, it is advisable to mix two crops. In addition, prickly heat can also be used for many years, a spontaneous way of raw grass. (2) cut the grass in time. When the grass grows to 20 ~ 30 cm high, it is necessary to cut in time. Fruit trees in the critical period of fertilizer, we must generally mow. Generally every year