Abstract:
Planting and breeding can be separated to improve the level of the planting and breeding cycle in agricultural production. The layout of the breeding farms near the planting farms can be expected to replace chemical fertilizer with organic fertilizer (manure). Agricultural pollution can also be alleviated, such as the excessive application of chemical fertilizers and local accumulation of manure. This study aims to evaluate the spatial relationship between breeding manure supply and planting manure demand from multiple dimensions. An example area was also taken as the Wugong county in Xianyang City, Shaanxi province, China. The farmland information was combined to be obtained from multi-scale remote sensing images. A comparison was then made from experience information on the breeding farms from the census. The results reveal that there was an insufficient supply of the nitrogen nutrient from manure. Among them, there was only 20.95% of the nitrogen nutrient demand of planting farms in the whole region, even far below the recommended value of the organic nutrients for the crops; Furthermore, there was the outstanding spatial agglomeration in 49 livestock and poultry farms among the 411 breeding ones. There was also the outstanding spatial mismatch between the supply of manure from the livestock-poultry and the demand for manure from planting farmlands (accounting for 11.94% of the total farmland areas); A breeding and planting cycle model was constructed to promote the manure absorption in farmlands. Among them, 16.01% of the farmlands were at risk of the nutrient surplus, while 83. 99% were in an inefficient use; Some livestock and poultry farms were so close to each other in the areas of farmland that were covered by the manure from the different overlapping areas. The average transport distance then increased for the manure transportation between breeding farms and their nearby farmlands. The reason was that the fertilization was repeated on its own land; Excess manure was transported into the more distant farmlands. Each plot of 1330.12m increased the average distance of the manure transport by two times, 856.76 m, compared with the non-overlapping squeeze state. There was coordinated application of organic manure between the planting and breeding industries at the regional level. A circular mode of planting and breeding was then replaced with a single breeding farm. It was necessary to improve the scale of livestock production during institutional design. Some supervision can be strengthened, including the overlapping warning of the farthest radius (less than 2.4km) and the absorption area into the regulatory area. There was an optimal maximum transport distance of manure from the breeding farms to the planting. Then the scale and spatial location of the breeding farms were determined for all manure from breeding farms returning to the fields; If there is an overlap area between the manure coverage farmlands, it is required to adjust the spatial relationship between the two breeding farms until the overlap area disappears. The finding can provide a valuable theoretical reference for the planting and breeding spatial layout at the county level.