Abstract:

Weihe Plain is the major grain production base of Shaanxi Province and the western. In this paper, the theoretical, the accessible, and the actual production capacities of arable land in Jingyang County were calculated respectively on the basis of the established theoretical and the accessible models of Weihe Plain secondary target zone in per unit area. The reasons for the differences of actual production capacity and statistic grain production were analyzed. All of these were useful for evaluating the county's farmland production capacity, land use intensity and potential production capacity, spatial variation of yield potential, county food security, strenthgening the potential of low-yielding fields, refinement of cultivated land resources management, and approving basic farmland protection goals. The results showed that the theoretical productivity was 89.32×104 t, accessible productivity 77.79×104 t, and actual productivity 48.00×104 t. Theoretical productivity, accessible productivity, and actual productivity in the per unit area are 19830 kg/hm2, 17270 kg/hm2 and 10657 kg/hm2. In spatial, the theoretical, accessible and actual productivity of per unit area showed a single peak distribution pattern with the central high, the north and south low; productivity of arable land in per unit area in the middle region is highest and lowest in the north region. The arable land in the middle and the south region in Liquan County are key regions of grain yield increment in future. The theoretical capacity of 13 level cropland in four natural quality level in Jingyang County was the largest, followed by 14 level cultivated land; the achievable capacity of 21 level farmland in 10 use level was the first, followed by 16 and 20 level arable land.