Why does the corn field have size seedlings?

The purpose of high-yield cultivation of corn is to build a good group structure and coordinate the development of various groups within the group. However, in actual production, the phenomenon of large and small seedlings is widespread, so that the individual bodies can not coordinate development, the formation of seedlings and small seedlings, resulting in the development of small seedlings into weak plants, the final formation of empty stalks or spikelets and affect the increase in yield.

Factors that contribute to the emergence of large and small seedlings in corn fields include:

drought. Due to the non-uniformity of the drought in the field, seedlings emerged earlier in the better-developed locust areas after sowing, emerged late in the poorly-fertilized plots, formed seedlings as early as possible, and emerged as late seedlings.

Different seeding depths. Due to the poor quality of the site preparation, unevenness of the ground, sowing in the high places where machinery is sown, and sowing in the low places; or due to the large amount of waste in the fields, and the difference in seeding depth due to mechanical operations. In the case of better lyricism sowing seedlings with a late emergence, sowing the seedlings early; in the more drought conditions sowing the seedlings early, sowing the seed so that the emergence of seedlings, so that the emergence of late, the emergence of seedlings early formation of large seedlings, the emergence of late Form seedlings.

There is no grading of seeds. Seed quality is not high, there is no grading, resulting in a large grain of strong seedlings, small grains out of weak seedlings, the results from the seedling stage began to appear large and small seedlings.

The seedlings and Dingmiao are delayed. Appropriate time seedlings and seedlings can avoid crowding seedlings, contend for each other, compete for fertilizer and compete for water, which will help foster strong seedlings. The work of seedlings is generally carried out in the 3 to 4 leaf stage of corn. Since corn is in the "weaning stage" before and after the 3-leaf stage, good light conditions are required to facilitate the manufacture of more nutrients and to supply seedling growth needs. If the plants at the seedling stage are overcrowded and the roots of the plants are intertwined, there will be competition for water and fertilizer. In addition, the overlapping leaves of seedlings not only affect the photosynthesis, but also prone to "flood shortage." Dingling is usually carried out at 4 to 6 leaves. If the fixed seedlings cannot be carried out on schedule, they will form thin, high seedlings in the seedlings of the seedlings, and the size of seedlings will eventually appear.

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