High temperature heat damage, corn how to prevent high temperature heat damage? Generally speaking, in the growing season of corn, as long as the temperature is too high, high temperature heat damage will occur, and severe production will be reduced. Let's take a look at how to prevent and cure high temperature heat damage in corn.
What are the hazards caused by high temperature and heat damage in corn?
1. lead to developmental delay
If the heat damage occurs in the corn seedling stage, the chloroplast structure of the leaves is destroyed, the activity of the enzyme is weakened, and the photosynthesis ability is reduced. At the same time, due to the high temperature, the respiration is enhanced and the nutrient consumption is high, which leads to the slow development of the corn seedlings.
2. During the reproductive growth period, high temperature can accelerate the physiological and biochemical reactions in corn plants, leading to shortening of growth period, resulting in smaller ear and lower 100-grain weight, which affects yield.
3. Corn flowering pollination period is very sensitive to temperature, more than 35 °C is not conducive to pollen development, more than 38 °C tassel does not flower, can not loose powder.
How to prevent high temperature heat damage in corn?
1. Water spray irrigation to cool down
In the event of heat damage, drought is generally superimposed, and watering and watering is the best way to eliminate heat damage. Before 10:00 am, after 3 pm, sprinkler irrigation should be carried out, avoiding high temperature during noon to avoid damage to corn.
2. Reasonable topdressing
On the basis of routinely applying 15 kg of urea per acre, spraying potassium dihydrogen phosphate to supplement potassium fertilizer, on the one hand, the leaf surface is cooled, and potassium can enhance the resistance. It can supplement copper and zinc trace elements, which can enhance the anther activity of filiforms.
3. Artificial assisted pollination
Because heat damage has an effect on corn pollination, artificial help pollination can increase corn seed setting rate and reduce problems such as empty grain, empty lines and baldness in corn ears.
4. Take cultivation measures to prevent
The high-temperature and drought-resistant corn varieties are selected. When planting, the plants can be planted in large and small scales to increase the ventilation and light transmission capacity. For the high temperature and humidity fields, the lower leaves of the corn are removed, which not only improves the ventilation conditions, but also achieves the purpose of diverging and cooling.
The above is the whole content of corn high temperature heat damage, only for the reference of the growers, in short, in order to prevent heat damage in the corn field, we must pay attention to the selection of seeds, according to the actual situation, take effective preventive measures to reduce the heat damage zone The loss.
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