Since this summer's summer, the weather has been rainy. During the period before cotton buds were transplanted to the bud, due to the adverse environmental impacts, the cotton seedlings were subject to physiological disorders, growth stagnation, and the phenomenon of “stuck seedlingsâ€. In this regard, response to disease prevention.
Waterlogged seedlings. Long-term low-temperature low-temperature illumination, poor root permeability, blackened roots, grayish-green leaves, slow growth, and the formation of waterlogged and frozen seedlings, and low waterlogging in cotton fields are particularly serious. Such tight-grained seedlings should immediately be drained and wetted, and high standards should be used to create a good ditch and main ditch to effectively reduce the groundwater level. At the same time, a good ditch should be opened to ensure that heavy rain drains quickly, so that the rain can be dried up. Grab the sunny day for cultivating and evacuating, between the rows, squat between the lines, warm the cotton seedlings to supplement the oxygen, and promote the early emergence of cotton seedlings.
Fertilizer harms stiff seedlings. The basal fertilizer is not fully decomposed, or it is applied too shallowly. The direct contact between the fertilizer and the roots of the cotton seedlings results in the burning of roots with concentrated fertilizers, resulting in dark reddish leaves, thin roots and even dead seedlings; herbicides, plant growth regulators or Improper pesticides cause burning of leaves, dead roots, and atrophy. Such a weak seedling should undergo a shallow cultivator and then spray 0.1 to 0.4% of trace elements such as zinc sulfate, ferrous sulfate, and boron.
Weak and weak seedlings. The seedbed lacks fertilizer, the weak seedlings are transplanted, or the quality of the site preparation is poor, the transplanting is too deep or too shallow, and the soil is not tightly sealed, resulting in fine and weak cotton seedlings. Such stiff seedlings should be cultivated in time to promote root development. The cultivator should be shallow and deep first, and the soil should be thinned and thickened in different times, generally 6 to 8 cm. After each cultivator, chase fertilizing material, each time using a slurry of biogas slurry or thin human or animal waste water, it can also pour 2 to 3 kg of urea per acre on the water.
Plant diseases and insect pests. Blight, blight, anthracnose, cotton aphid, thrips, and other pests and diseases caused damage, perforation, curling or growth point of cotton seedling leaves, resulting in yellowish red leaves, thin roots, close internodes, short plants. Such severe seedlings respond to the disease, timely control of diseases and insect pests, and appropriate fertilizer, and promote the early emergence of cotton seedlings.
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