陕西省中低产田改造模式研究陕西省中低产田改造模式研究是陕西省农业区划办公室、陕西省农业经济研究所共同承担的陕西省攻关项目。该研究查清了陕西省中低产田的数量分布，按障碍因子把中低产田划分成９大障碍类型，１０个区类和６个一级改造区，８个二级改造区，提出了... Study on Transformation Mode of Middle-low-yield Land in Shaanxi Province The study on transformation mode of middle and low-yield farmland in Shaanxi Province is a key project jointly undertaken by Shaanxi Provincial Agricultural Division Office and Shaanxi Provincial Institute of Agricultural Economics. The study identified the distribution of middle- and low-yielding farmland in Shaanxi Province. According to the obstacle factor, the middle-low yield farmland was divided into nine major types of obstacles, ten district types, six first-level rebuilding areas and eight second-level rebuilding areas. ..