Factors that cause the appearance of small and large seedlings in corn fields include:
drought. Due to the uneven soil moisture in the arid field, the seedlings emerge early in the areas with good moisture, and late in the areas with poor moisture, the early seedlings form large seedlings, and the late seedlings form small seedlings.
The sowing depth varies. Due to the poor quality of the site preparation, the ground is uneven. When the machine is planted, the high place is planted deep, and the low place is planted shallow; or because the field is large and large, the planting depth is different. In the case of good soil moisture, the late seedling emergence is late, and the shallow seedling emerges early; in the drought, the deep seedling emergence is early, and the shallow seedling emergence is waited for, so that the emergence is late, early emergence forms large seedlings, late emergence Formation of seedlings.
The seeds are not graded. The seed quality is not high, and there is no classification, resulting in strong seedlings in large grains and weak seedlings in small grains. As a result, large and small seedlings appear from the beginning of the seedling stage.
Intermiao and Dingmiao were postponed. Timely seedlings and fixed seedlings can avoid crowding of seedlings, fight each other for light, fertilizer and water, which is conducive to the cultivation of strong seedlings. The thinning work is generally carried out in the 3 to 4 leaf stage of corn. Because corn is in the "weaning period" before and after the 3 leaf stage, good light conditions are required to facilitate the production of more nutrients and supply the needs for seedling growth. If the plants in the seedling stage are overcrowded and the roots are interlaced, the competition for water and fertilizer will occur. Moreover, the leaves of the seedlings overlap each other, which not only affects photosynthesis, but also prone to "seedling shortage". Seedling setting is generally carried out at 4 to 6 leaves. Intermittent seedlings cannot be carried out on schedule, which will result in the formation of weak and tall seedlings in the areas with many seedlings, and finally large and small seedlings.
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