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What kind of soil conditions are needed for high corn yield?
Good soil conditions are the foundation of corn growth and development. The water, fertilizer, gas, heat and other factors required for corn growth come directly or indirectly from the soil; 3/5 of the nutrients needed for corn come from the soil. Therefore, in order to achieve high yields of corn, it is necessary to carry out soil reclamation, increase fertility, improve soil structure, and create good irrigation and drainage conditions. 1. Good soil structure Maize is a crop that requires more oxygen. The optimum amount of oxygen content in the air of the soil is 10% to 15% of the optimum maize root growth. If the oxygen content is less than 6%, it will affect the normal respiration of the root system, thus affecting the root system. Absorption of various nutrients. High-yield corn requires deep soil, loose ventilation, and good structure. The thickness of the soil should be more than 1 meter, the thickness of the living soil should be more than 30 cm, the aggregate structure should account for 30% to 40%, and the total porosity should be about 55%. The capillary porosity is 35% to 40% and the soil bulk density is 1.0 to 1.2 g/cm3. 2. Organic matter and mineral nutrient-rich High-yield corn requirements for soil organic matter are: 1.2% brown soil, 1.5 or more brown soil; total soil nitrogen content is greater than 0.16%, nitrogen available nitrogen is more than 60 mg/kg, hydrolysis nitrogen At 120 mg/kg; soil available phosphorus 10 mg/kg; soil available potassium 120 to 150 mg/kg; soil trace element boron content greater than 0.6 mg/kg; molybdenum, zinc, manganese, iron, copper, etc. 0.15 mg/kg, 0.6 mg/kg, 5.0 mg/kg, 2.5 mg/kg, 0.2 mg/kg. 3. Adapting to soil moisture status Soil moisture status during maize growth is one of the important factors limiting yield. According to tests, soil water content of corn seedlings is 70% to 75% of the field water holding capacity, about 60% emergence to jointing, 70% to 75% jointing to tasselling, tasselling to silking time 80% to 85%, The fertilization period is 75% to 80% for the milk ripening period, 70% to 75% for the milk ripening stage to the wax ripening stage, and about 60% for the ripening stage for the wax ripening stage. When the soil containing rivers falls to 55% of the rivers in the fields, it is Irrigation should be organized immediately. Soil color can be used to judge soil water deficit in the field. Such as the second soil, when the depth of 6 to 10 cm soil color from yellow to gray, hand into a group, but the landing is scattered, indicating that the beginning of insufficient soil moisture, should be timely irrigation. During the hot summer, the field water evaporates quickly, and the large area of ​​corn is widely used to promote water consumption. Generally, no more than 10 consecutive days of continuous raining, it is necessary to fill irrigation water, otherwise it will affect the normal growth of corn and reduce production.