After the cotton was transplanted, it was during the rainy season, when the temperature was low, there was more rain, and there was less light, which resulted in the cotton seedlings returning green and slow, and the flower bud differentiation was postponed, resulting in the phenomenon of “freezing seedlingsâ€. The main types of stiff seedlings are: First, flooding and seedlings. Commonly found in low-lying cotton fields, long periods of overcast and rainy weather form waterlogging, causing roots to become black, leaves grayish green and grow slowly. The second is drought and seedlings. Mainly due to drought, dry yellow leaves, new roots less, very slow growth, a large proportion of red stems. The third is fertilizer damage. The main reason is that the basal fertilizer is applied too shallowly. The direct contact between the fertilizer and the roots of the cotton seedlings causes the roots to be thick and fat. The performance is that the leaves are dark and red, often accompanied by physiological lesions, and the roots are thin. The fourth is weak seedlings. Poor site preparation quality, extensive transplanting, excessively deep or shallow planting, and tightly closed soils cause this type of seedlings to grow, resulting in small and weak seedlings and not shrinking. 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. After the occurrence of severe seedlings, the cause should be carefully searched for symptomatic prevention and treatment. For flooding of flooded areas, drainage should be used to cool down and protect the roots. A high standard should be used to create good conditions, such as Yaogou, Xianggou and Weigou, to ensure that the rainstorms in May and June will be discharged quickly. The groundwater level will be reduced to below 60cm. Sumiyoshi. And timely cultivating dampness, squat between the lines, between the strains shallow, for the early increase of temperature and oxygen supplement cotton seedlings. For early-stage damage, the most effective method is watering, which can be done by means of inter-irrigation or water diversion. Floods should not be flooded and the ground temperature should be prevented from rising. For fertilizer damage, scientific fertilization should promote early-onset. Basal fertilizer should be reasonably matched and deepened, generally about 2,500 kilograms of farm manure in Mushi, or 40 to 50 kilograms of compound fertilizer, and 1.5 kilograms of boron fertilizer, which can prevent and control shortage of nutrients. 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 weak seedlings, the cotton fields before cotton transplanting should be finely sorted, and the specifications should be narrowed into narrow trenches, soil fine ground, uniform fertility, and imaginary solids to prevent hanging root-type stiff seedlings. Hair provides a comfortable environment. After transplanting, the cultivating soil should be cultivated in time to promote the development of the root system, combined with cultivating earthworms, cultivating loose soil and promoting transformation. The cultivator should be shallow and deep first, and the root of the cultivating soil should be low, high, and divided, and the soil should generally be 8 to 10 cm. And combined with chase fertilizer material, a small number of times, the general Mu with urea 2 to 3 kg of water pouring, but also with 6 to 8 acres of thin man and animal waste water pouring. Each topdressing should be done after cultivating. Regarding the disease caused by insect pests and diseases, we should do a good job of prevention and treatment work on the basis of field investigations. And Mushi urea 3 ~ 5 kg, foliar spray 0.2% ~ 0.3% of potassium dihydrogen phosphate 2 ~ 3 times to promote the early recovery of cotton seedlings, early hair long.
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