Effects of land lease policy on changes in land use, mechanization and agricultural pollution

Land fragmentation has restrained the development of Chinese agriculture with the application of agricultural machinery. Meanwhile, agricultural pollution has caused serious problems with development. To address these problems, China's government proposed a new farmland lease policy and built larger farms beginning in 2013. However, changes in land fragmentation may also have unexpected problems for Chinese agriculture. This study investigated the effects of these changes on changes in land use, the application of machinery and agricultural pollution. We analyzed a developed area (in the fields of both agriculture and industry) and studied the decision-making habits of farmers in the area. An agent-based model was proposed with the same decision-making habits as in the real world. The results indicated that land lease increased agricultural profits very little in Jiangsu, China. Meanwhile, the application of land lease policy increased pollution. To alleviate pollution and increase profits, a new policy for large automatic protection machinery (i.e., large spraying machinery) should be introduced by governments simultaneous with land lease policy. Farmers could realize greater profits through the introduction of land lease policy and high-efficiency machinery. The sustainable development of agriculture in Jiangsu requires the integration of these government policies