What are the countermeasures for the sustainable development of American agriculture?

American agricultural sustainable development model In recent years, the United States has made some achievements in the research of sustainable agriculture. Several specific models have been preliminarily explored:

First, crop rotation practice. Reasonable rotation is helpful to inhibit weeds and pests, improve plant nutrient supply, prevent soil erosion and reduce water pollution. Therefore, crop rotation is a core content of the current sustainable farming system in the United States. There are two main ways of crop rotation in family farms: one is two-year corn-barley (interplanting pasture)-three to four-year pasture-corn; The other is 1 2-year-old corn -2-year-old soybean-wheat. In addition, there are many ways such as wheat-cotton rotation and grass-cotton rotation.

Second, the no-tillage method with less stubble cover. This technology has been used in the United States for more than 20 years and still occupies a dominant position in no-tillage farmland. Mainly through mechanized straw crushing and high stubble harvesting technology, the straws of wheat, soybeans, peanuts and other crops are directly returned to the field, and special 6 or 4 rows of large and medium-sized no-tillage sowing are adopted. A large number of experiments show that this method can obviously reduce the amount of chemical fertilizer, increase soil organic matter, preserve water and prevent weeds. At present, about 70% of farmland in the United States adopts this technology.

Third, integrated pest management. In order to reduce chemical pesticides and improve the control effect, this paper adopts the comprehensive application of biological mulching, crop rotation, developing forage suitable for natural enemies, seed coating treatment, insect-resistant varieties and other systems to achieve the purpose of reducing pesticides and protecting the environment. At present, it has been greatly developed in the production system of fruit trees and vegetables.

Fourth, the combination of agriculture and animal husbandry. In the United States, the combination of agriculture and animal husbandry is a common feature of most large farms. From the arrangement of planting system to production and sales, we attach great importance to the close relationship between planting and breeding system, and the scale of breeding determines the adjustment of planting structure. Forage, feed and fertilizer promote and coordinate with each other in breeding and planting. Animal manure from farms is returned to the field through transportation pipelines or directly dried and solidified into organic fertilizer, which not only prevents environmental pollution, but also improves soil fertility.

(Source: North Science and Technology Network) I hope I can help you.