岳阳县东部低山区的坡耕地,成土母质为花岗岩,质地疏松,加上传统的两熟耕作,雨季换茬翻耕,土地裸露,加剧了水土流失,光热资源不能充分利用,一般亩产350公斤左右。为了探索解决这一问题的途径,我站从1983年开始,进行了麦田套种黄豆,改两熟制为三熟制的保土增产效果试验研究。 试验地设在月田乡毛家村的坡耕地上,土壤质地为中砾质粗沙土,其机械组成为1mm以上的砾石占42.1％,0.1～1mm的粗砂占24.7％,粒径小于0.1mm的颗粒占33.2％。肥力较低,耕层20厘米,坡度21度。小区面积两熟者107.28平方米,三熟套 Yueyang County in the low mountainous areas of eastern slope farmland, the soil is composed of mother of granite, loose texture, coupled with the traditional two-tillage farming, plowing and tillage in the rainy season, bare land, aggravating soil erosion, light and heat resources can not make full use of general mu 350 kilograms or so. In order to explore ways to solve this problem, I started from 1983, the wheat field intercropping soybean, changing two-cropping system for three-year trial of increasing yield effects. The experimental site is located on the sloping farmland of Maojiacun, Yuetian Township. The soil texture is medium gravel thick sandy soil. The gravel with the mechanical composition of more than 1mm accounts for 42.1%, the coarse sand with 0.1 ~ 1mm occupies 24.7% and the grain size is less than 0.1mm Of the particles accounted for 33.2%. Low fertility, 20 cm of plow, slope of 21 degrees. Area of ​​two ripener 107.28 square meters, three sets of sets