Calculation Method of Land Use Coefficient in Agricultural Land Gradation
农用地分等中的土地利用系数计算

Two-step Measurement, a new method of land use coefficient for agricultural land gradation, is put forward in this paper. This method not only reflects the actual level of land use and the ability level of land management in a region, but also reveals economic relation of land use activities. The actual coefficient of land management is the product of ability coefficient of land use and desire coefficient of land use. The actual coefficient of land use equals to actual yield of crop divided by potential yield of this crop locally. The ability coefficient of land use equals to the maximal crop yield divided by potential yield of this crop. The maximal crop yield means the highest crop yield created by fully exerting of production ability. The desire coefficient of land management equals to actual yield of crop divided by the maximal crop yield created by fully exerting of production ability. According to the principle and method of C-D production function model, the statistical model of land use coefficient calculation is established. The land use coefficient of 15 provinces is estimated by applying this statistical model. The results indicate that the actual coefficient of land use is higher in Hebei province, Henan province, Shandong province, etc. The ability coefficient of land use is higher in Guangdong province, Jiangsu province, Shandong province, etc. The desire coefficient of land use is higher in Hubei province, Hunan province, Anhui province, etc. Based on the data of 15 provinces, the land use coefficient at different economic development level is estimated. The results reveals that the actual level of land use is highest in the middle developed area, i.e. farmers have the desire of land use in this area. Although land management ability is maximal in the developed area, the actual level of land management is not highest, because farmers have lower desire of land input. Although the actual level of land management is lower in the developing area, the desire coefficient of land management is highest in this area.