What is the reason why corn is not good?

What is the reason why corn is not good?

1. Influence of genetic characteristics of varieties

Some varieties have short bud sheaths and weak top soil. Even if they are planted in the depth of conventional sowing of most varieties, it is difficult to emerge, not to mention that the seeding is too deep. This problem can be avoided by knowing the characteristics of the variety at the time of purchase.

2, the impact of seed quality

First, the seed germination rate is not high. The germination rate of qualified seeds in the state is not less than 85%. When the seed dehydration stage suffers from frost, improper storage conditions, and storage expires, the germination rate will be significantly reduced.

Second, the germination is poor, the top soil is weak, and the emergence is not good. Third, the seeds are mixed with old seeds with low germination rate. When the seed quality is poor due to poor seed quality, the emergence of the same batch of seeds in different plots is consistent, otherwise there may be other reasons.

3. Influence of soil conditions

In saline-alkali soil, due to the high salt concentration in the soil solution, the osmotic pressure is high and the seeds are difficult to absorb and germinate. Even if it is germinated, the young root buds are limited by the tolerance of salt, and there is a phenomenon of reverse osmosis, which causes physiological dehydration, which is wilted before being unearthed and seriously affects emergence.

Soil is sticky, and post-sowing rainfall is likely to cause soil compaction, which affects the emergence of young shoots.

Maize seed germination needs to absorb 50% of the dry weight of the seed. The soil holding capacity of the cultivated layer is about 60%, which is conducive to germination. The soil moisture content is too low, the moisture is not good, and the seed is not enough to absorb the seedlings. Spring drought in dryland occurs frequently, so soil moisture in spring maize area is often the key factor affecting emergence.

Excessive moisture prevents the seeds from breathing normally and is susceptible to mold attack, causing mildew in the seeds.

4. Effects of farming and sowing quality

The whole land is extensive, the soil is sloppy, the soil runs through the wind, the water is insufficient, and the seeds sowed cannot be in close contact with the soil. The land is not flat and the sensation is uneven. It also has a great influence on the seed germination and sprouting. The improper seeding depth is also an important reason for the emergence of seedlings. The sowing is too shallow and the seeds fall on the dry soil. The broadcast is too deep, the buds are difficult to top soil; the soil is not flat, the depth of the machine is different, the shallow seeds are not broadcast on the wet soil, and the stalks are not conducive to emergence, and there is no decomposed roots in the soil. Earthworms, straw, and overhead soil affect the quality of sowing, and the mulch film that varies in the depth of the soil, or hinder the root system. Or affecting the topsoil of the young shoots, this is another reason that affects emergence.

5. Impact of sowing date and meteorological conditions

For spring maize, the sowing date is actually a problem of high temperature and low temperature. The temperature of the ground is generally affected by the temperature. There is also a difference in the temperature of the soil under different soil quality, topography and coverage. In sandy loam and sunny slopes, the temperature rises rapidly; while in the wetlands, clay fields, shady slopes, and straw cover, the temperature rises slowly. The seeds are germinated and germinated, and the seedlings are excavated to require suitable soil temperature. The low temperature of the germination of the corn seeds is 6-7 ° C. At this time, the germination takes a long time and is prone to mildew.

When the soil temperature of the tillage layer is 10-12 °C, the seed germination is faster and tidy! However, the radicle and germ growth are slow, and it usually takes more than 13 days to unearth. This temperature is used as the low temperature indicator for sowing. When it reaches 18-20 °C, it takes only 7-8 days to emerge, so sowing too early is not good for emergence. After sowing, continuous low temperature, soil temperature rise, and soil compaction caused by storms after sowing, also affecting emergence.

6. Impact of pests, mechanical injuries and phytotoxicity

Degranulation, the seeds are mechanically damaged during processing, and the embryos are damaged by feeding and pests during storage. After sowing, the seeds are prone to mildew. When the seeds are mixed with seeds or coated, the amount of overdose or mixed seeds is uneven! It may cause phytotoxicity. The phytotoxic seeds may not germinate, or the growth of the buds may be inhibited, the deformed bones may be deformed, and the tops are not unearthed.

Excessive or uneven fertilization during sowing, or direct contact between chemical fertilizer and seeds, can burn out young shoots is also a remedy.

Underground pests such as cockroaches, cockroaches, etc. can feed seeds in the soil, bite off the young buds, and the squirrels can tunnel in the tillage layer and eat seedling seedlings, which can cause seedling ridges and stagnation at low temperature and high humidity after emergence. Under the conditions, seedlings that are not resistant to disease are susceptible to attack by diseased bacteria and can cause blasts.

When seed damage and pesticide damage cause poor emergence, often the same batch of seeds will occur. Fertilizer burns and pests and diseases may differ depending on the planting plot.

Corn seed is a living organism that is once again planted in a larger and more complex ecosystem. In addition to the genetic traits and seed quality of the seed itself, it is also affected by soil, climate, farming, cultivation, and disease. The effects of various adverse conditions such as pest damage.

There are natural factors as well as human factors. These factors alone or in combination affect several factors. Through the on-the-spot investigation and analysis of various factors that may induce the emergence of seedlings after emergence, it is possible to clarify the reasons. It is important to continuously summarize the lessons learned in production practice and try to avoid and overcome those artificial or natural adverse effects. In order to obtain the material basis of Miaoquan, Miaoyun, Miaozhuang, and high-yield production.

(Original title: Corn is not good, it turned out to be caused by them)