山东省胶州市里岔乡谭四果园座落在村西南河边上,面积40亩,各种果树985株,土层瘠薄,其中靠河边的250株苹果树地面20厘米以下全是大粗砂,保水保肥力很差,树势生长衰弱,产量很低。1985年赵自新承包后,为了彻底改变低产面貌,决心做好抽砂换土工作。他在果树行间挖宽1.5米、深1米 Shandong Province Jiefu Township Tan Si orchard is located in the village southwest of the river, covering an area of ​​40 acres, 985 kinds of fruit trees, soil infertility, of which 250 by the river apple ground 20 cm below the ground are all coarse Sand, water and fertilizer poor fertility, tree growth weak, low yield. Zhao Zixin contract in 1985, in order to completely change the appearance of low-yielding, determined to do a good job of sand extraction and soil replacement. He dug 1.5 meters wide and 1 meter deep between rows of fruit trees