The Latest Methods to Prevent High-Temperature Damage in Corn
When it comes to this time every summer, the dog days arrive, and the dog days are the weather in which all crops are most prone to pests and diseases. They also have a great impact on corn growth. Many friends do not know what kind of damage high summer temperatures can cause to corn, and even if they know, they do not understand how to prevent and control it. So how exactly should the damage to corn during the dog days be prevented? Let's take a look.
1. Artificial pollination
Everyone knows that when corn encounters continuous high temperature and drought, its pollination and fertilization, pollen shedding and seed-setting rate all decline. If continuous high temperature weather occurs right when corn is flowering and shedding pollen, it is unfavorable for its natural pollen shedding, reducing the probability of pollination and fertilization, resulting in fewer seeds and affecting yield. At this time, artificial pollination should be used to increase the success rate of corn pollination and fertilization under high temperature conditions. Pollen should be collected from 8-10 in the morning, when the pollen is the most abundant and freshest of the day. Pollinate immediately after collecting to increase the pollination rate.
2. Reduce density
When planting corn, the planting density in the field should be calculated well. Too sparse a density will cause corn to produce branches and multiple ears. If the density is too high, it will affect the nutrient absorption of each plant and affect the permeability of the field. A reasonable planting density can reduce the conflict among individual plants over water, allow each plant to develop normally and grow robustly, and give it stronger resistance to high temperature environments. This indirectly reduces the damage of high temperature to corn. If the planting density is already too high, the wide-and-narrow row planting method can be used. This method can improve problems such as poor permeability and poor development caused by excessive density.
3. Scientific fertilization
In the process of fertilizing corn, fertilizer should be applied reasonably, and the amount of organic fertilizer used should be appropriately increased in the fertilizer. The purpose is to promote the nutrient release of the base fertilizer in the soil, and attention should also be paid to the use of trace elements. During the seedling emergence stage, fertilizer should be applied to enhance the drought resistance of corn stalks and leaves, while during the large trumpet stage, the main focus is on the flower ears. A water-fertilizer combined method should be adopted to enhance the drought resistance of corn itself. During high temperatures, more foliar fertilizer should be applied, which can both cool and preserve moisture and provide the nutrients corn needs.
4. Timely watering
High temperatures will very likely lead to drought. During the period when drought is approaching, watering should be done in advance. First, it can lower the temperature in the field, and second, it also provides sufficient water. The evaporation effect on the ground surface is strengthened, lowering its temperature and reducing the damage caused by high temperature. High temperature also affects the respiration of corn. Weakened respiration in corn will lead to poor development, and carbon dioxide in the plant cannot be discharged in time, affecting the seed-setting rate. Water can also be directly poured on the leaves to lower the body temperature of the entire crop.
Friends should be reminded that high temperature and drought will cause heat damage to corn, and heat damage will seriously affect the normal growth of corn, leading to a large reduction in corn yield or even total crop failure. In high temperature weather, the water demand of corn increases sharply. Many friends still water according to the amount used before the high temperatures, which leads to high-temperature damage and reduced yield in corn, so friends must take the high-temperature damage of corn seriously.