Corn disaster prevention and disaster reduction technical measures

In recent days, large-scale precipitation has occurred in Hebei Province, and in some places, the rainfall is too large and there has been hail damage in the corn fields. Maize is a crop that requires large amounts of water and is not tolerant. When the soil moisture exceeds 80% of the water holding capacity, the plant growth and development are affected. During the middle and late growth period of maize, in the conditions of high humidity and rainy conditions, the rhizosphere often suffocates due to lack of oxygen, resulting in a rapid decline in viability, and the plants are unripe and abandon. This has a great impact on the yield. There is data that the general accumulation of corn before and after tasselling Water 1 to 2 days, the impact on production is not obvious, 30% of water production in 3 days. Stagnant water decreased by 40% in 5 days. Based on the experience of various regions, the following management measures can be taken for maize that has been affected by disasters:

I. Timely Drainage Once water is found in the field, deep trenches can be used to divert water from the field early to reduce the temperature and humidity of the soil and air in the field, and to promote plant growth.

Second, the cultivation of plant plagues often causes lodging. If the locust plague occurs earlier, the plants can restore their upright growth. But now it is about to enter the big bell-mouth period, and the plants have lost their ability to stand upright and restore their upright growth. They should be artificially raised and firmly established. However, the aerial roots of newborns should be avoided as far as possible, and the removal of foliar sediment should be taken care of to restore the normal photosynthesis of the plants.

3. When cultivating and cultivating soil can be used to land, timely cultivating loose soil and cultivating soil, breaking compaction, improving soil permeability, and restoring the roots of plants to normal physiological activities as soon as possible.

Fourth, increasing the availability of nitrogen fertilizer by waxy corn tends to show yellow, stalk red, growth and development stagnation; increasing available nitrogen fertilizer, can improve plant nitrogen nutrition, accelerate plant growth, reduce flood damage.

Fifth, to promote the occurrence of premature locust plague, plant growth and development is inhibited, delayed maturity, must be artificially promoted ripening, commonly used in the production of ripening methods are: (1) fertilization. During the silking stage of corn, 10 kg of ammonium nitrate was used to grow fertilizer, or 0.2% to 0.3% of potassium dihydrogen phosphate solution (or 3% of superphosphate calcium leaching solution) was sprayed on the leaves. If the silking period has been postponed, it can be passed through by intervening males to reduce nutrient consumption, increase leaf temperature, and accelerate the fertility process; (2) Sun stick method. In the late corn filling stage, when the grain reaches normal size, the loquat leaves are peeled off to expose the grains and promote dehydration, drying and ripening; (3) drying method. If the sowing time for the next crop has reached, but the corn is still not fully mature, the corn can be chopped off. It can be at the field side or in other idle places (be careful not to pile up large heaps) until the leaves dries up and then pulls down the ear.

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