The first is to prevent premature aging. Because corn plants are tall, they will inevitably consume large amounts of nutrients and water during growth. Excessive water in the fertility will cause soil hypoxia. At this time, the root activity is weakened and the water absorption is difficult, but the leaf transpiration is not reduced, especially in sunny days. The leaves consume more water, which can easily lead to physiological metabolic disorders. The leaves curl and grow slowly. If the fertilizer is lacking at this time, the plants will become slender and even wither. Control methods: If there is a rainy area, drainage and anti-smuting should be done well. If there is a trend of premature aging or yellowing of the leaves, the application of fine fertilizer or spraying of phosphorus fertilizer should be applied at the early stage of flowering to extend the green leaves and increase the ear. Or potassium sulfate fertilizer can also prevent premature aging.
Second, there is insufficient supply of air-defense culms and malnutrition, which can not meet the requirements for nutrients during ear differentiation, or the density is too large and the photosynthetic intensity is weak, while nitrogen fertilizer, low phosphorus, and potassium deficiency all cause empty stalks. Control methods: When planting, attention should be paid to the density, which requires Daehang corn not to be sealed to ensure ventilation and ventilation of the plant. It is necessary to supply nutrients and moisture in a timely manner in order to facilitate ear differentiation and development. At the same time, attention should be paid to nitrogen, phosphorus and potassium during fertilization. The three elements are properly combined. The soil with poor soil fertility should be applied with more organic fertilizer. In areas with high soil fertility, more phosphorus fertilizer should be applied during the seedling stage in order to grow long roots and strong stalks. During head differentiation, fertilization should be carried out. If too dense or weak, please pull it out in time.
Third, there is a lack of phosphate fertilizers in the lack-of-grain and bald soils. Plants in the booting and flowering stage, such as sugar metabolism and protein synthesis, cell division is blocked, the top of the spike will shrink, filament elongation will also slow down, affect natural pollination, and it will lead to baldness. Even empty ears. Soils such as potassium deficiency, transport of soluble carbohydrates to the grain are hindered, and grain-starch starch is also necessarily less. Or early infestation of insects, wind damage caused by the lack of nutrient delivery, or flowering during the rain, pollen fertilization obstruction, etc. will cause baldness, pods or empty grains. Control methods: To prevent premature plant failure, the key is to prevent pests and diseases, apply more phosphate fertilizer, potash fertilizer, such as drought in case of spinning, watering and irrigation in time, the best flowering artificial pollination.
The fourth is that the density of lodging and lodging is too large. When the stems are elongated, the management of the fertilizer and water is improper, and it is easy to cause lodging and affect the yield. Control methods: When planting, we need to deepen the cultivation layer, increase the base fertilizer, properly cultivate the soil when cultivating, and make the corn stably. Fertilizer should pay attention to the combination of nitrogen, phosphorus, and potassium, and pay attention to the plant density to ensure that the growing leaves have enough sunlight to make the plants robust and thicken the seedlings to increase their lodging resistance.
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