What affects the high yield of summer corn?

What affects the high yield of summer corn? Please introduce that there are four problems that can not be ignored in summer maize production, which have become important factors restricting the high yield of summer corn: first, careless seed selection. Some farmers have the mentality of being "greedy for bargains" and buy low-priced "improved seeds" from small traders or informal seed management departments. most of these seeds are self-produced, the seed production procedures are unscientific, and the seed purity is not up to standard, resulting in a serious reduction in production. Therefore, to the formal seed management departments, the selection of improved varieties suitable for planting in this region is the premise to achieve high yield of maize. Second, the density is too high. In order to achieve the purpose of high yield, some farmers blindly increase the planting density, resulting in excessive plant density, resulting in poor growth per plant, high empty culm rate and serious bald tip of female ear, resulting in varying degrees of lodging, resulting in reduced yield. Reasonable close planting is an important link to achieve high yield of summer maize. Different close planting ranges should be selected according to the characteristics of different varieties. Even the density of the same variety should be flexibly controlled according to soil fertility and sowing date, high soil fertility or late sowing should be dense, and middle and lower fertility plots or early sowing should be sparse. Third, fertilization is not scientific. There are widespread phenomena of heavy nitrogen fertilizer, light phosphate fertilizer, ignoring potassium fertilizer and micro-fertilizer in agricultural production. Due to the application of too much nitrogen fertilizer, maize often has poor lodging resistance and serious diseases and insect pests, resulting in varying degrees of yield reduction. Phosphorus and potassium fertilizer and micro-fertilizer should be applied deeply or as early as possible before jointing, and nitrogen fertilizer should be applied in stages, 2cm 3 of the total amount of nitrogen fertilizer applied at jointing stage and 1cm 3 at big trumpet stage. In addition, the application of foliar fertilizer during the growing period can significantly increase the yield. Fourth, watering is not timely. Some farmers do not water corn according to the law of water demand, it is often found that drought before watering, thus missing a good opportunity to promote plant growth and development. Under the premise of sufficient moisture and sowing, jointing and booting water, heading and flowering water and grouting water should be irrigated in time to meet the water needs of plant growth and development. Click to get more corn planting techniques click to get more food crop planting techniques