Recently, many food growers have consulted in the background to ask: Is it a matter of corn emptying, no seeding, and baldness? How to cure? Today, Hui Nongwang Xiaobian talked with everyone about the reasons why corn is not seeded and its prevention measures.
1. First we need to understand how corn kernels are formed.
Corn has female flowers and male flowers. Male flowers are like brooms and grow on the top of corn plants. Female flowers grow in the middle of corn. Mature female flowers will stick out many whiskers like whiskers. Each flower must be formed in the future to form. A corn.
Pollination means that the pollen of the male flower falls on the "beard". If the "beard" does not have pollen before pollination, the corn will be short of grain in the future. The grain is due to poor pollination or pollination too late.
2. What are the manifestations of corn seedless?
Empty stalks are a common phenomenon in corn production, mainly as follows:
(1) The side is not real, that is, the whole side of the ear has no grain from the base to the top, and the panicle type is multi-directional and the grain side is curved;
(2) Gypsophila, the whole ear is very few grains, and the ear of corn is scattered;
(3) Baldness, no seeds or kernels in the upper part of the corn;
(4) The base of the ear is not true, that is, a part of the lower part of the ear is not strong.
3. What is the reason for corn not seeding?
(1) Planting problems
The planting density is too large, resulting in severe shading and shading, poor illumination, poor ventilation and light transmission, reduced photosynthetic efficiency, affecting the development of the filaments of the female ear, resulting in poor pollination of the corn.
(2) Insufficient fertility
Insufficient soil fertility is one of the important reasons for corn to produce empty stalks. Under the same planting density, the fertilization is less than that of fertilization; the lower the fertility, the higher the density, the worse the firming; the application of single fertilizer is higher than that of formula fertilizer, and the application of nitrogen, phosphorus and potassium is reasonable. It can effectively increase the seed setting rate, increase the rate of spikes in the absence of potassium; decrease the seed setting rate in the soil when nitrogen and phosphorus are absent; when the boron is deficient, the photosynthesis of the plant is affected, the transport of nutrients is blocked, and the ear is damaged by energy. The seed setting rate will also drop.
(3) Temperature and humidity are not suitable
Before and after stagnation, the water is deficient in water, and the silk is delayed. The interval between tassel flowering and earing is relatively prolonged, which affects pollination. During high temperature and low humidity during powder loosening, the pollen loses its vitality and appears to be granulated. Under normal circumstances, the temperature during the loose powder period is more than 35 degrees for three consecutive days, or the maximum temperature of the day is above 38 degrees, the corn pollen is killed, affecting fertilization, resulting in failure to be normal.
(4) Bad weather conditions
From the big bell period to before heading, it is the period when corn needs the most water and fertilizer. If the weather is dry, it will affect the normal flowering of the tassel and the extraction of the fringe of the ear, causing the tassel to advance and the silking delay, the vitality of the pollen is weak, the filament is easy to wither, and the pollination is poor.
During the pollination period of corn, if the rainy weather is insufficient and the weather is insufficient, the pollen will swell and rupture to death or stick into a mass, losing the ability to pollinate, so that the fringe of the ear can not be pollinated in time, which will result in empty or "stars".
(5) Pest and disease hazards
The corn flower grain stage is endangered by corn borer, aphid and other pests, leading to premature senescence of functional leaves, which will also increase corn empty mites and severely form empty ears.
(6) Pesticide phytotoxicity
The use of highly toxic pesticides when spraying insecticides and the use of highly toxic pesticides cause corn infertility.
4. Prevention and control measures for corn non-seeding
(1) Reasonable close planting
According to the characteristics of corn varieties, reasonable close planting is conducive to ventilation and light transmission, improve photosynthetic efficiency, increase ear nutrition, and promote ear differentiation.
(2) Corn emasculation
Appropriate emasculation during corn tasseling, weakening the apical dominance of maize plants, promoting the development of the ear, assisting artificial pollination, and increasing the pollination rate.
(3) Reasonable irrigation
Prevent the occurrence of "ka neck drought" in the big trumpet period of corn, timely watering in case of drought in the big bell mouth period, promote the development of ear, and promote the normal pollination and fertilization of corn.
(4) Scientific fertilization
Using formula fertilization technology, master the principle of “applying sufficient base fertilizer, lightly applying seedling fertilizer, re-applying joint fertilizer and booting fertilizer, and skillfully applying seed fertilizerâ€. The base fertilizer is mainly organic fertilizer, and is applied with appropriate amount of nitrogen, phosphorus and potassium fertilizer. The topdressing is mainly based on nitrogen fertilizer, which is mainly carried out at jointing and booting stage, and the attacking fertilizer is properly applied in the later stage.
(5) Strengthen pest control
During the silking period of corn stalking, attention should be paid to the prevention and control of corn mites and mites. The chemical control is mainly spray.
(6) removal of no effect spike
Most of the hybrid corn varieties are single ear varieties. Except for the upper ears of the plants, the second and third ear parts are removed, the development is late, the silking is late, and the silk is not fertilized. It is an ineffective ear and consumes a large amount of nutrients. In this way, nutrient concentration can be saved to supply the main ear, and the main ear can be increased, which not only increases the grain weight and the quality of the corn, but also promotes early maturity.
The above is the reason for corn corn empty rod, no seeding, baldness and prevention methods. You can consider the actual situation comprehensively, and the specific operation method is recommended to consult the local agricultural bureau experts!
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