吴县地处长江三角洲的太湖之滨,西部为丘陵地区,东部为平原河网地区。1979年全年粮食总产达15.0207亿斤,平均亩产1,394.6斤,1978年底开始了第二次土壤普查,按照因地制宜、因土改良的原则,狠抓了成果应用,促进了农业增产。深耕改土针对目前土壤耕层变浅、犁底层增厚变实的问题,我们采取深耕改土措施,取得了良好效果。据全县土壤普查统计,在5,584个土壤剖面中,有90％的耕作层不到15厘米,其中50％少于13厘米。由于浅耕,耕层以下土壤长期耕翻不到,不能晒垡,加上淹 Wu County is located in the Yangtze River Delta coast of Taihu Lake, hilly areas in the west, east of the plain river network area. In 1979, the total output of grain amounted to 15.0207 billion jin, with an average yield of 1,394.6 kilos per mu. At the end of 1978, the second soil survey was started. According to local conditions, due to the principle of land improvement, the application of achievements was promoted and agriculture was boosted. Deep plowing and soil improvement In light of the current problems of shallow soil plowing and thickening of plow bottom, we adopted the method of deep plowing and soil improvement and achieved good results. According to the county’s soil census, 90% of the 5,584 soil profiles are less than 15 cm, of which 50% are less than 13 cm. Due to shallow plowing, the soil below the tillage long-term plowing, can not sunburn, plus flooding