In the past few years, when the author contracted a million mu of cotton in Xijiang Township, Hanchuan City, Hubei Province, Zeng Fanming, Party Secretary of Changhe Township, questioned me next to the cotton seedling nursery bed. He also asked why I had cotton seedlings in the nursery. When the shell emerges, the cotyledons on both sides of the bed membrane can be flattened. Why do some cotton plants sprout after the roots grow up and the cotyledons point downwards? Farmers similar to the old ones can also meet each year. We call these differently shaped cotton seedlings deformed seedlings. Too many cotton seedlings will affect the quality of cotton seedlings and should be prevented in a timely manner.
According to the author's many years of investigation, there are eight types of common deformed cotton seedlings: one is the young fat stem seedling with smaller cotyledons; the second is cotton seedlings with shelled seedlings whose cotton shells have not been unearthed; The roots of the young roots are exuded; the fourth is the emergence of slender young bulbs; the fifth is the rust of the young seedlings of the cotton seedlings; the sixth is the linear seedlings of the elongated stems of the young stems; It is a young leaf that appears wrinkled leaves; eight young chicken leaves are chicken feet.
The reason for producing shelled seedlings is that the cotton covers the soil too shallow; the second is that the seedbed is not irrigated; Due to insufficient endosperm turgor pressure, the cotton hull was brought out of the soil surface without being detached. The reasons for the occurrence of lame seedlings are: First, the thickness of the cotton cover is uneven; some of the cotton seeds are exposed; second, when the seeds of the cotton are sown downward, the radicles are picked up toward the soil surface after they are unearthed. The reason for the emergence of spherical seedlings is mainly that the amount of seeding in the seedlings is too large and the seedlings have formed into a group. The reason for the occurrence of rust seedlings is that the compaction of the cover soil by the cotton seeds is too tight; second, the groundwater level is too high, both of which are likely to cause insufficient oxygen supply, resulting in the rust or rot of the young root tip. The main reason for the emergence of linear seedlings is that the diameter of the nutrient bowl is too small, followed by excessive sowing. The main cause of shrinkage seedlings is caused by seedlings suffering from freezing injury. The main reason for the emergence of chicken feet is the misuse of plant growth regulators.
In order to make the cotton once seeded once seedlings, strong seedlings early, improve the quality of cotton seedlings, we must take timely preventive measures to avoid the occurrence of abnormal seedlings. One is to use wool cotton seeds sowing, sowing with warm soup before sowing. The seeds are sown with fine-processed cotton, and they must be irrigated at one time, and no watering is required before emergence. Second, the thickness of the cover soil after sowing of cotton seeds is only 1.5 to 2.0 cm, which should not be too thin or too thick; the third is pure cotton.é’µ only need to sow one seed; fourth is to promote large seedlings nursery, the body diameter of 7-8 cm, cotton seed to be leveled; five is to choose seedbed sheltered sunny, no shade, no clear dark spot; It is necessary to pay attention to the prevention of freezing injury in the cultivation of seedlings for nutrition, so that the seedlings do not leave the bed without leaving the planting film. Seventh, the seedlings are suitable for the use of 2,4-D.
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