1. Careless seed selection Because the current system of seed breeding is not yet perfect, unqualified corn seeds still occupy 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. Unreasonable planting density The high 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) is more than 5,000, which is more than that of the varieties. Appropriate density is about 1/3 more. 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, ubiquitous nitrogen fertilizer, light phosphorus fertilizer, ignore the phenomenon of potassium and trace fertilizer. 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. The idea that watering is not timely depends on the magnitude of the rain. It is not always based on the water requirement of corn. Instead, the “critical water†is poured, but in the case of drought, the “water for life†is poured, which seriously affects the yield.
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