The type of stiff seedlings. The first is the flooding of young seedlings. This is the most common form of a kind of stiff seedling. It is commonly found in low-lying cotton fields or low-lying areas of cotton fields. Long-term overcast and rainy weather will result in clear water damage, resulting in darker roots, grayish green leaves, and slow growth. The second is the dry and injurious seedlings. The main manifestations are dry yellow leaves, less new roots, very slow growth, and a large proportion of red stems. The third is fertilizer damage. The basal fertilizer was applied too shallow, and the direct contact of the fertilizer with the cotton root resulted in thick roots and roots. This is the main reason for the formation of this kind of frozen seedlings. The symptoms are dark and red leaves, often accompanied by physiological lesions, and the roots are skinny. The fourth is weak seedlings. Poor quality of preparation, extensive transplanting, excessively deep or too shallow planting, and tight soil sealing caused such a kind of weak seedlings, resulting in small and weak seedlings and not long shriveling. The fifth is plant diseases and insect pests. Bacterial blight, anthracnose, blight, thrips, cotton aphid and other pests and diseases, often caused by lack of holes in the leaves of cotton seedlings or curl, yellow leaves red, small roots, close internodes, plants dwarf and stiff seedling.
Prevention and control measures. After the occurrence of severe seedlings, the cause should be carefully searched for symptomatic prevention and treatment of the above symptoms. In the case of flooding, the water should be cooled down and the roots should be drained. The high standards should be used to open the Yaogou, Xianggou and Weigou to ensure that the rainstorm in May and June will be discharged quickly. The groundwater level will be reduced to less than 60cm. Waterlogging, and timely cultivating dampness, deep squat between the lines, shallow between the lines, for early warming cotton seedlings and oxygen. The most effective way to prevent freezing seedlings from drought is watering. In order to prevent the rise of ground temperature due to watering, we can use the method of inter-irrigation or water diversion, and avoid flooding. For fertilizer damage, scientific fertilization should promote early-onset, basal fertilizer should be reasonably matched and deep-applied, generally about 2500 kilograms of farm manure in Mushi, or 40 to 50 kilograms of compound fertilizer, and 1.5 kilograms of boron fertilizer to prevent nutrient deficiency. Type of stiff seedlings. Any cotton field where there is obvious fertilizer damage should undergo a shallow cultivator, hold the water on sunny days, and then apply 0.1% to 0.4% of trace elements such as zinc sulfate and ferrous sulfate. For weak and stiff seedlings, the cotton fields before transplanting the nutrient é’µ cotton seedlings must be finely sorted, and they should be narrowed into narrow trenches, the soil should be finely grounded, and the soil and fertilizer should be evenly distributed. Miao early hair to provide a comfortable environment. After transplanting, the cultivating soil shall be cultivated in time to promote the development of the root system, combined with soil hoeing, cultivating tillage, and promoting transformation. The cultivator shall be shallow and deep first, and the root of cultivating soil shall be low, then high, divided, and usually cultivated 8 to 10 cm. In this way, it is not only beneficial to enhance the ventilation of the soil, increase the temperature of the ground, promote deep rooting, but also conducive to drainage and dehumidification, combined with chase fertilizer, but can not be used too much at a time, so that a small number of times, generally mu with urea 2 ~ 3 kilograms, pouring water, but also with 6 to 8 per acre with thin people and livestock manure water pouring, each top dressing should be carried out after cultivator, is conducive to the upgrade of weak seedlings. In case of severe disease caused by pests and diseases, on the basis of field investigations, the right medicine should be prescribed and prevention and treatment should be done. Urea can be applied to urea at 3 to 5 kilograms, and foliar spraying of 0.2% to 0.3% of phosphoric acid. Hydrogen and potassium solution 2 to 3 times, to promote the early recovery of cotton seedlings, long hair early and long, for good quality and high yield to build a good production shelf.
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