Picture of corn baldness and corn deficiency symptoms and prevention methods

The top of the corn bald tip is not called the bald or bald top. The number of corn kernels is reduced, resulting in reduced yield. The corn granules are expressed in various forms. One is that the whole side of the ear has no grain from the base to the top, and the ear shape is curved on the side of the multi-directional deficiencies. Second, there are few kernels in the whole ear, which are scattered on the ears. Third, the top of the ear is small, white or yellowish white, called the bald tip. Severe baldness can account for more than half of the entire ear, and the bald tip is the main form of corn granules.

There are many reasons for the lack of grain in corn. In the past two years, this situation is mainly caused by herbicides. For example, wheat herbicides may not be harmful to wheat in the early stage, but may cause harm to corn in the later stage. It is also possible that a non-corn-specific herbicide is sprayed, or that the herbicide in the surrounding field drifts onto the corn plant, which will cause the corn to not grow but will not die, or the corn will continue to grow but not long or No seeding phenomenon.

In addition, some corn seed coatings contain organic phosphorus, and some herbicides will chemically react in corn plants, which will have adverse effects on corn. If it is a herbicide hazard, be sure to use corn-specific herbicides in future production.

There is also a direct cause of the "maize rough disease" caused by the gray planthopper, which is the peak period of the activity of the gray planthopper after the emergence of the corn. In view of the fact that the "corn shrinkage disease" is easy to prevent and treat, the expert suggests: For light plots, the diseased plants should be pulled out and brought out of the field in time, the field management should be strengthened, and the losses should be minimized. For plots with a disease rate of more than 30%, it is necessary to replant early-stage autumn crops in time. .

In addition, poor pollination or late silking, sparse pollen in the field may also lead to corn deficiency. For example, when the powder is scattered, it will affect the normal flowering pollination; or when the flowering is hot and dry, the soil moisture is insufficient, the pollen and filament life is shortened; or the pollination period is not pollinated.

Causes of corn abrupt granules

The reasons for corn abrupt deficiencies are closely related to the variety, soil, nutrients and fertilizers, climate, cultivation management, and the severity of pests and diseases.

1. Variety. Due to the different adaptability of different varieties to the external environment and the resistance to adverse environments, when the adverse external environmental conditions exceed the adaptation range of the varieties, it is prone to alopecia.

2. Soil sandyness. The soil has high salinity, low and easy to lick, the farming layer is too shallow, the water storage capacity is poor, and the thin soil is heavier.

3. Nutrition and fertilizer. When fertilizing, the application of nitrogen, phosphorus and potassium is improper, no application or less application of organic fertilizer and micro-fertilizer, especially in the soil, phosphorus or boron deficiency, or in the middle and late stages of maize growth, insufficient water supply, especially in the flowering and filling stage of corn It affects the manufacture and operation of organic matter, making corn silking late, reducing pollen in the field, shortening the life of pollen and filament, and causing corn abdomen to lack grain.

4. Climate. The corn has a continuous drought in the middle of the growth period, causing repeated leaf rolling, or high temperature and dry weather during flowering, insufficient soil water supply, affecting the development of the male and female ears of corn; or cloudy and rainy when the corn is loose, affecting normal flowering pollination; or pollination There is no wind in the weather, and poor pollination can cause baldness and lack of grain.

5. Cultivation management. Excessive management, or planting density is too large, resulting in poor ventilation and light transmission in the field, insufficient light, weak photosynthesis of plants, reduced organic matter synthesis, affecting the development of male and female ears, causing baldness and lack of grain.

6. The extent of occurrence of pests and diseases. Corn leaf spot disease and corn seed blight, sheath blight, and stem-based rot can affect the normal growth and development of corn, resulting in poor growth of corn, especially when corn aphids begin to occur in large numbers during corn withdrawal. Corn does not normally flower and pollinate, causing baldness and lack of grain.

Prevention measures for corn abalone

1. Planting excellent varieties. According to the local climate characteristics and cultivation conditions, select and plant varieties with strong resistance to disease, insects and adaptability.

2. Improve soil and enhance soil water retention and fertilizer retention capacity. Advocate the application of organic fertilizer and deep ploughing and cultivating techniques to improve the soil structure, promote the growth and development of corn, and enhance its resistance to adverse external environment.

3. Rational fertilization of water. It is necessary to increase the application of organic fertilizer and rationally cooperate with the application of nitrogen, phosphorus and potassium, especially to prevent the lack of phosphate fertilizer and boron fertilizer in the field. In the water supply, it is necessary to prevent drought and damage. After the jointing of the corn, the reproductive organs are vigorously developed, and the water supply should be timely and appropriate to promote the development of the male and female ears.

4. Strengthen cultivation management and rational close planting. According to the variety, soil fertility and cultivation methods, the density should be determined according to local conditions to create a good ventilation and light transmission condition, to meet the light requirements of the middle and upper leaves, and to promote the development of the male and female ears.

Strengthening cultivating and weeding and cultivating soil, especially after soiling after jointing, can enhance the permeability of soil and promote the development of corn roots. Large and small ridge planting techniques are used to improve ventilation and light transmission conditions in the field. Artificially assisted pollination techniques are used when adverse climatic conditions are encountered that affect normal pollination.

5. Control pests and diseases. For the control of corn seed blight, sheath blight, stem-based rot, 30% of the seedlings can be used as a seedlings, or 40% of the triazole alcohol emulsifiable concentrate, which accounts for 0.02% of the seed. The oxazolol cream is seeded.

After the diseased plants are found in the field, use 30% of the seedling WP WP 800 times solution 50% thiophanate-methyl WP 800 times solution, or 80% of the Green hen 2 700-800 times solution Diluted 1000 times Tianda 2116 mixed spray has good control effect on corn seed blight, sheath blight and stem-based rot.

After the occurrence of leaf spot in the middle and late stages of corn growth, spray control can be carried out with 50% methyl thiophanate WP 800 times solution or 50% carbendazim WP 800 times solution.

For the control of corn aphids, at the end of the corn heart, 3% of carbofuran granules can be used for 3 kg, or after corn cob, 40% of omethoate emulsifiable concentrate 1000 times, 10% of imidacloprid WP 3,000 times. The liquid is sprayed and controlled.

Summary: Corn is a wind-flower flower in cross-pollination. Plants with cross-pollination are easily restricted by external environmental factors. For example, if there is no wind during pollination or when it encounters rainy weather, the ability to pollinate is greatly reduced, thus reducing The opportunity to fertilize affects the yield of fruit and seeds. The ear of corn is often lacking in grain, mainly due to insufficient pollination. In order to compensate for the natural pollination deficiency, if it is supplemented by artificial assisted pollination, the seed setting rate can also be improved.

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