In July and August of this year's rain and heat season, the rainfall is more than in previous years, and corn is prone to lodging, which will have a certain impact on the yield of corn. According to the level of corn lodging, the degree of reduction in production is different, and serious ones may lead to the possibility of no harvest.
First, corn lodging can be divided into stem fall, stem fold and root fall according to the degree of lodging and time.
1. Stems fall: also known as bending down, the root position of the plant remains unchanged, and the stem is bent and twisted. In this type of plot, the rain on the plants should be gently shaken with bamboo sticks after the rain in order to reduce the pressure on the plants. After the weather is fine, the plants will gradually recover their upright growth. When shaking off the rain, care should be taken not to move the plants as far as possible to prevent artificial breakage of the stems.
2. Stem fold: The root position of the plant remains unchanged, breaking from the base of the three or four nodes. Such lodging plants are usually difficult to recover, basically do not produce yield, are not easy to take rescue measures, let it grow naturally or directly remove.
3. Roots down: The position of the roots of the plants changed, one side pulled up and the other poured.
Second, according to the level of corn lodging, classification management:
1. For lodgings that are lighter (the stem-to-ground angle is greater than 45), lodging occurs before the small bell-mouth (8-10 leaf stage), the plants can be automatically restored to an upright state without affecting normal pollination in the future. Little impact, no need to take artificial measures such as lifting, allowing it to grow naturally. If it is artificially raised, it will inevitably be rooted, and it will no longer take root. It will not only affect the yield, but it is prone to secondary lodging.
2. Tattooing occurs before and after pollination. It is necessary to start from the upside when lodging, and to raise the roots of the corn well, it is best to operate together. One person will grab the upper part of the corn plant and gently pull it up, while the other person will raise the soil in the root. The height should be 6-8 cm. It is better to fall on the same day. The day can not be more than 3 days. After 3 days, it can't be helped any more. Instead, it can even reduce the output.
Lodging after the ear was extracted. Moderate lodging (30-60 degrees with the ground), artificially lifted according to the above method, you can also 3-5 corn straighten, in the corn crest location with a thin string of straw tied together, it is best not to Bundle corn leaves. After 3 days, the tying ropes were sheared to allow the corn to grow naturally, which basically had no effect on the post-growing and production of corn.
3. For the whole fallen corn plant, under the premise of not injuring the stems and roots, support under the ear position with bamboo sticks, etc., so that the ear of corn from the ground about 30 cm to prevent rat damage and prevent mildew. While lifting and supporting the plants, the bottom leaves can be combined to enhance ventilation and light transmission.
4. For corn with broken stems, remove the broken plants out of the field as soon as possible to avoid rot, affecting normal plant growth. For severely broken plots, it is necessary to pay close attention to clearing agricultural plots and replanting vegetables such as radish, garlic, cabbage, and green vegetables with a short growing period.
Second, artificial pollination
The corn is laid down after heading, and the male and female ears lie in the ground, or the branches and leaves are blocked, so it is difficult to pollinate, artificial pollination is performed, and the seeding rate is increased.
Third, timely compensation
The lodging of corn due to poor photosynthesis, physiological function is disturbed, affecting growth and development. For a field that only weighs once, you can chase it once more. If the topdressing fertilizer is not applied P and K fertilizers, phosphorus and potassium fertilizers shall be used as main fertilizers. Mushi DAP and KCl shall each be 5 kg. The first application of topdressing shall be applied with P and K fertilizers. The degree of lodging shall be combined with the degree of lodging. , increase nutrition and promote maturity.
Fourth, pay attention to pest control
Lodging of corn is often prone to disease, we must pay attention to prevention and treatment. Corn gray leaf spot, size spot disease: At present, the better control agent is 25% propiconazole emulsion 10 ml/mu, or 12.5% ​​difenoconazole powder 10 g/mu, respectively 60 kg evenly sprayed.
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