1, selection is not careful. Because the current system of seed reproduction is not yet perfect, unqualified corn seed still occupies a large proportion. Some peasants are greedy for cheap, and purchase so-called fine varieties at low prices from small traders or informal seed management departments, resulting in serious production cuts.
2, the planting density is irrational. Too much planting density is a prominent problem in the current summer maize production. For example, some farmers plant “Nongda 108â€, and the number of seedlings per 667 square meters (1 acre) reaches more than 5,000, which is about 1 more than the suitable density of the variety. /3. Due to the high density, the growth and development of the individual plants was poor, the empty stalk rate was high, and the baldness of the ears was severe, resulting in different degrees of lodging, resulting in reduced yields.
3, fertilization is not scientific. In fertilization, the phenomenon of heavy nitrogen fertilizer, light phosphorus fertilizer, neglect of potassium fertilizer and trace fertilizer is common. The crop yield is limited by the minimum nutrient law. A single excessive application of nitrogen fertilizer can not achieve high yield, but will be due to excessive nitrogen fertilizer, resulting in poor lodging resistance, serious diseases and insect pests, resulting in varying degrees of reduced production. In addition, improper fertilization and blind application of certain effective nutrient contents (Note: the pure content of nitrogen, phosphorus, and potassium, and the medium and trace elements should not be counted) are too low for “maize specific fertilizersâ€. Caused a drop in production.
4, watering is not timely. The idea of ​​relying on the rain of the heavens is severe. It is not always based on the law of water demand of corn. Instead, it is poured into the “water for life†when it is affected by the drought, which seriously affects the yield.
2, the planting density is irrational. Too much planting density is a prominent problem in the current summer maize production. For example, some farmers plant “Nongda 108â€, and the number of seedlings per 667 square meters (1 acre) reaches more than 5,000, which is about 1 more than the suitable density of the variety. /3. Due to the high density, the growth and development of the individual plants was poor, the empty stalk rate was high, and the baldness of the ears was severe, resulting in different degrees of lodging, resulting in reduced yields.
3, fertilization is not scientific. In fertilization, the phenomenon of heavy nitrogen fertilizer, light phosphorus fertilizer, neglect of potassium fertilizer and trace fertilizer is common. The crop yield is limited by the minimum nutrient law. A single excessive application of nitrogen fertilizer can not achieve high yield, but will be due to excessive nitrogen fertilizer, resulting in poor lodging resistance, serious diseases and insect pests, resulting in varying degrees of reduced production. In addition, improper fertilization and blind application of certain effective nutrient contents (Note: the pure content of nitrogen, phosphorus, and potassium, and the medium and trace elements should not be counted) are too low for “maize specific fertilizersâ€. Caused a drop in production.
4, watering is not timely. The idea of ​​relying on the rain of the heavens is severe. It is not always based on the law of water demand of corn. Instead, it is poured into the “water for life†when it is affected by the drought, which seriously affects the yield.
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