What is the rotten seed and rotten seed of corn?

Reasons for corn rotten seeds and rotten seedlings :

 

1. Low ground temperature: sustained low temperature has a certain degree of influence on the germination potential and germination rate of corn seeds. According to experiments , the germination potential of seeds decreased by 9.4% compared with the control ( average 15 °C ) at a low temperature of 10 °C ; the germination rate decreased by 6.7% compared with the control ( average 15 °C ) . It can be seen that the low temperature acts mainly on corn by delaying emergence. Affected by low temperature, the germination rate is significantly reduced, which can lead to a significant decrease in the emergence rate of the field. Sowing too early, improper sowing is due to premature sown by rushing, often encounters cold and cold caused by slow germination, causing seeds to mold or rotten buds.

 

2 , the humidity is large: after sowing, even the rainy days, the soil water content is too large, the seeds are in a state of flooding for a long time, so that the seeds suffocate powder seeds or rotten seeds.

 

3 , improper seeding depth: seed sowing too deep or too shallow due to extensive land preparation or when the soil moisture in the field is too large, the seeds are too deep, the seeds are numb due to lack of oxygen, even if the seedlings grow out due to the extension of the stems in the ground Long, the endosperm nutrient consumption is too much and the growth is thin and difficult to survive. In the case of soil drought, high soil temperature, and sufficient sunlight, the seeds are too shallow, and the seeds are also blocked due to insufficient water absorption, and the emergence of seedlings is slow or unearthed. Sometimes, although the seeds can germinate on the surface, the roots can not be deep-rooted, forming weak seedlings, resulting in lack of seedlings and ridges, directly affecting yield.

 

  4 , fertilizer: seed and fertilizer are too close when planting, and after the sowing, the seeds are eroded by the volatile fertilizer when the seeds germinate, causing the seed of the seed.

 

5 , phytotoxicity: the use of closed herbicides after the rain, so that the germination of the buds caused by phytotoxicity to inhibit the growth of rotten buds, the long-term residual soybean herbicide used in the previous two years may also cause germination of the buds The phytotoxicity causes rotten buds.

 

6. Poor soil structure, improper tillage The corn seedling stage is particularly sensitive to soil structure. The soil leakage and slabs affect the permeability and temperature of the soil, so that the corn stalk cannot penetrate the soil layer. The hard soil block has poor water permeability, and the soil particle structure is compact, and the seed is hindered due to difficulty in water absorption, causing seed germination failure or emergence.

 

7. Underground pests. After sowing, the seeds are destroyed by underground pests. This situation is more serious in the soils with insufficient moisture and green corn. The underground pests that harm corn are mainly golden worms, tigers, ants, etc.;

 

  8. Improper use of chemical fertilizers, long-term use of a single chemical fertilizer (diammonium, urea) makes the soil easy to form a knot, destroying the soil particle structure. Excessive fertilization causes rotten buds, deformed seedlings, and rotten roots. Seeds and seed fertilizers are too close when planting. In the case of rain, the seeds are eroded by the volatile fertilizer when they germinate, causing the powder to be bad.

 

Control measures for corn seed powder and rotten buds:

 

  1. Choose the right time to sow, arrange the season reasonably, don't blindly grab the early, and sow according to local nature and production rules. Dry land, mid-levels and high-mountain mountains should be promptly rushed to cover the underlying species. If the soil moisture is too large, it can be appropriately delayed and planted under reasonable sensation. The sowing depth is 3-5CM , and the soil temperature should be 12-18 °C. It should be mastered according to the weather forecast to avoid cold damage and freezing damage.

 

  2. Scientific operation, improve the quality of the next; first, intensive cultivation, ridges and soil control, and reasonable soil moisture. It is not easy to break when it is too wet, and it is too dry to cultivate the original clods. The control of ploughing should be 18-22cm . If the ploughing layer is too deep, it will form the loam of the tillage layer and reduce the soil fertility. If it is shallow, it will not reach the mature soil and eliminate the disease. The role of insects.

 

  3. Improve seed quality and seed treatment before sowing. It is necessary to choose a regular enterprise or a seed company, choose high-quality seeds, and choose a variety suitable for the local natural environment and climatic conditions, which is especially important for controlling corn seed powder or rotten buds.

 

4. Seed treatment before sowing; seed treatment, first select seeds, do a good germination experiment, generally require germination rate of not less than 90% , before planting, soaking seeds, which can promote seed ripening and enzymes Vitality, enhance the water absorption capacity of seeds, increase the germination rate and germination potential of seeds;

 

  5. Improve the quality of sowing; the premise is that the planting depth should be consistent. The sowing depth should be flexibly controlled according to the local soil conditions and sowing methods. The sowing depth should be 3-5cm , and the drought should be properly deepened. Secondly, the seeding volume should be mastered to ensure Miao Quan Miao Zhuang.

 

6. Pay attention to the use of chemical fertilizers and pesticides. In the process of using chemical fertilizers and pesticides, attention should be paid to the effects on the seeds. The base fertilizer should be applied deep to avoid burning.

 

7. Control underground pests. The use of seed dressing agent can effectively prevent underground pests, corn is not lacking seedlings, and effectively prevent corn rough disease; and control the occurrence of later aphids, the bell mouth does not have to lose heart and prevent cockroaches, the corn seedlings are seedlings after seed dressing, and the root system is developed. , grasp the dungeon, strong resistance to lodging, thick stems, large spikes of corn, reduce the baldness of corn.

 

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