1991年春,本村在滩地细沙土上定植红富士苹果园8.67 hm~2(公顷),行株距为3m×2m,每公顷栽1667株。当年的7月上旬,对6.67 hm~2幼园树盘覆盖了麦草,每公顷覆麦草22500-30000kg;对1.33 hm~2幼园树盘覆盖了鲜杂草,每公顷覆鲜杂草45000-60000kg;对0.67 hm~2幼园树盘未覆草为对照。经过当年7月下旬至8月中旬的干旱调查,覆盖鲜杂草的园块,幼树长势良好,没有发生干腐病;覆盖麦草的园块,幼树长势中庸,干腐病病株率为1％-1.5％;未覆草的对照园块,幼树长势极弱,干腐病 In the spring of 1991, 8.67 hm ~ 2 (hectare) of Red Fuji apple orchard was planted on the fine sandy soil of the beach with a row spacing of 3m × 2m and 1667 plants per hectare. In early July of that year, wheat straw was covered in the tree tray of 6.67 hm ~ 2, with 22,500-30000 kg of wheat straw per hectare. Fresh trees were covered in the tree tray of 1.33 hm ~ 2, with 45,000- 60000kg; 0.67 hm ~ 2 kindergarten tree tray is not covered with grass as a control. After the drought survey from late July to mid-August of the same year, the seedlings covered the fresh weeds, the sapling grew well and no dry rot was observed. The seedlings covering the wheat straw grew moderately and the rate of diseased plants was 1% -1.5%; control plot without grass, saplings grow very weak, dry rot