果园的改土试验我大队果园土壤特点:表土层25—30厘米为壤土,是好土层,以下50厘米是沙土,再往下50厘米左右为粘土。果树根系分布情况:95％以上根系多分布在30厘米的表土层内,而沙土层内根系分布极少,这样就造成果树怕涝、怕旱、易倒伏等缺点,严重影响了果树的高产、稳产和产品质量。成为我队果树发展的严重障碍。从70年开始进行土壤改良,其方法是逐年挖沟换土改变土层,挖去沙土层,并由里向外 Orchard soil test I brigade Soil characteristics: 25-30 cm topsoil is loam, is a good soil, the following 50 cm is sand, and then down about 50 cm for the clay. Root distribution of fruit trees: more than 95% of the roots are distributed in 30 cm of topsoil, while there are very few root systems in the soil layer, which causes the fruit trees to be afraid of waterlogging, afraid of drought and easy to fall, which seriously affects the yield of fruit trees, Stable production and product quality. Become a serious obstacle to the development of our team fruit trees. From 70 years of soil improvement, the method is to change the soil every year digging ditches to change the soil, dredged sand layer, and from the outside