我县是个丘陵山区县,78万亩耕地中有49万亩是丘陵山地。这些地土层薄,肥力差,水土易流失,过去种玉米亩产仅300多斤。从1974年以来,我们总结推广了山地种植垵田玉米经验,使产量逐年提高。1980年种植4万多亩,平均亩产达到750多斤。增产原因(一)加厚了活土层。通过深翻打垵使活土层从原来的4—5寸加厚到8—9寸,改善了土壤结构,有利微生物活动,促进了根系发育。(二)做到了集中施肥。改过去分散施肥为集中施垵肥,防止了养分流失。(三)有利于抗旱保墒。垵田蓄水能力增强,能 My county is a hilly mountain counties, 78 million mu of cultivated land in 49 acres are hilly mountains. These thin layers of soil, poor fertility, water and soil loss easily, in the past only 300 kilos per mu yield of corn. Since 1974, we have summed up and popularized the experience of planting corn in the mountains to increase production year by year. In 1980 planted more than 40,000 mu, the average yield reached 750 kilos. Reasons for increasing production (A) thickened live soil layer. By deep pounding 垵 so that the living soil layer from the original 4-5 inches thickened to 8-9 inches, improved soil structure, beneficial microbial activity, and promote root development. (B) to do a concentrated fertilization. Change the past to disperse fertilization concentrate fertilizer, prevent nutrient loss. (C) is conducive to drought and soil moisture.垵 Tian water storage capacity, can