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The technical route for increasing maize production is that modern science and technology combined with traditional fine agronomy to stabilize the area and increase yields; to promote high-yield, disease-resistant and dense-tolerance hybrids as breakthroughs, increase the input of materials, especially fertilizers, and improve fertilization and irrigation Technology to expand the area of ​​film cultivation. 1. Select high-yield, disease-resistant and dense-resistant hybrids According to research, China's corn heterosis plays a role of 20% to 24% in genetic gain. In the 1990s, the replacement of maize varieties was characterized by the fact that compact leaf-type corn, which was rushed on leaves and dense and high-yielding, replaced some flat leaf-type corn. It had three distinct characteristics. One was good light transmission, and the other was high leaf area index. The third is high biological yield and economic coefficient. Nowadays, the promotion of compact maize in China has reached 100 million mu, which plays an important role in increasing corn production. 2. Increase the planting density and increase the utilization of light energy The promotion of compact leaf type maize has increased the planting density per acre by more than 1,000 plants. Comprehensive experience, the current production of compact corn density per acre of 4000 ~ 5000, the maximum leaf area index of 4 ~ 5, improve the utilization of light energy, average yield per acre of 500 ~ 600 kg. Increase the planting density according to the soil fertility conditions. The lower limit of the fertilizer area is desirable, and the upper limit of the fertilizer area is desirable. It is roughly estimated that the national corn planting density is still relatively thin, and that most regions can also increase about 1,000 per acre. 3. Improve fertilization techniques and strengthen management of fertilization According to research, fertilization of maize plays a role of 28% to 30% in increasing production factors. First, according to the law of demand for corn, that is, for each 100 kg of corn produced, it needs to absorb 2.84, 1.22, and 2.49 kg of nitrogen, phosphorus, and potassium. The higher the yield, the smaller the amount of fertilizer needed per unit area, and the second is the use of "three attack" fertilizer. That is, on the basis of applying base fertilizer, the joint stalk is attacked during the jointing period, the heading is attacked during the booting period, and the grain is attacked during the grain filling period. The third is the rational allocation of the top dressing amount. Fertilizers should adopt the “pre-light and heavy†fertilization technology. The development trend of corn fertilization is: adopting a new type of compound high-efficiency fertilizer, carrying out nutrient diagnosis, full-scale balanced fertilization, establishment of an optimized fertilization model and consulting service system, and striving for a further increase of fertilizer utilization by 10% to 15%. 4. Scientific irrigation, saving water Maize 500 ~ 600 kg per mu, need to consume 300 ~ 320 square meters of water, about 1/3 of China's irrigation corn. The development of water-saving irrigation and improvement of water use efficiency are the key points for implementation, and the increase of 1.5-2.0 kilograms of corn per square metre of water is required. Development trends: First, develop from high yield irrigation to water-saving irrigation; second, promote plastic water hose irrigation and channel seepage control technology; third, strengthen early corn research and promote integrated cultivation techniques for water storage and flood protection, and improve precipitation. Utilization rate. 5. Extend the cultivation area of ​​plastic film, skillfully use the seasons and temperature-increased corn film-covering cultivation to have good heat, moisture, nutrients, and comprehensive effects, with the effect of warming the earthworms, increasing temperature and increasing yield, generally increasing the yield by 30% to 60%. 1 times more. Development trend: from the plateau mountain to the plain, from the north to the south, from a film to a film for more use, in particular, the promotion of advanced film-laying machinery and the application of various types of degradable films, maize film cultivation has broad prospects. 6. Based on the disaster-resistance harvest China has a vast territory, with great differences in natural conditions, and a variety of corn planting methods. Each year, droughts, earthworms, and insect pests occur to varying degrees. For example, in the autumn of 1994, the continued high temperature rarely seen in the past, severe corn damage in some areas, bald tip grain, heavy reduction. Therefore, it is necessary to strengthen the research and prevention of natural disasters in agriculture based on a good harvest.