Since the beginning of the summer, the southern cotton area has experienced more rainfall and more rainfall, and the cotton area has suffered from locust plagues to varying degrees, especially in low-lying cotton fields. The whole plant is submerged for more than 3 days or soaked for more than 7 days, and the roots are rotted and turned yellow. Withered, the possibility of survival is minimal. In this regard, effective remedial measures should be taken.
Clean up the ditch
After the occurrence of flood damage, the field trenches should be cleaned up in time, drained when grabbed, and the ditch and the corresponding drainage ditch should be deepened to reduce the groundwater level and reduce waterlogging as soon as possible to reduce the impact on the growth and development of cotton and reduce the mortality of cotton seedlings. For cotton fields that are not matched, not standard or washed badly in the ditch, they are timely repaired and cleaned up, and the dredging around the cotton field and the poorly drained areas are promptly dredged and dredged. For the cotton fields where the water level of the surrounding ditch is higher than the field level, the pump is pumped in time. . Doing a good job of cleaning and clearing ditches after damaging can also provide favorable conditions for the upcoming flood irrigation.
Seedlings wash seedlings loose soil
After being drained from the cotton fields, the fallen cotton plants are straightened, and the seedlings are washed while returning the water. The sludge on the cotton leaves and stems is cleaned, so that the cotton leaves can resume ventilation and photosynthesis functions as soon as possible. After the cotton plants are upright, the soil needs to be cultivated so that the plants can grow upright, the ventilation and light transmission conditions of the cotton fields can be improved, and the root system can gradually return to normal physiological functions.
Timely fertilizer application
When the weather is fine, combine the loose soil to break the board and apply top-dressing nitrogen fertilizer in time to supplement the fertilizer that is taken away by the water and promote the new roots of the cotton seedlings to grow quickly. For the first time, diluted manure dung water can be poured on the root side, 200-250 kilograms per mu, and then watered with 2% urea solution 5-7 days later. At the same time, foliar dressing can be used to spray Po, 0.2% potassium dihydrogen phosphate solution plus 1% urea, spraying 45-50 kg per acre, to promote the early recovery of physiological function of cotton seedlings. When the cotton plant returns to normal growth, it can be used to fertilize 10-13 cm away from the cotton plant (points), using 10-15 kg of available ammonium nitrogen per acre, or 5-7.5 kg of urea.
Strengthen pest control
Due to the susceptibility of cotton plants to bacterial blight, anthrax, damping-off, and epidemics, prevention and control should be strengthened. Grasp the sunny days as early as spraying 50% carbendazim 800-1000 times 1-2 times, or 1:2:100 times Bordeaux mixture to enhance disease resistance. After the new branches and leaves of the cotton plants grow, the cotton seedlings are vulnerable to damage from various insect pests such as aphids, thrips, blind stink bugs, and red spiders.
Shifting strains in parallel
For cotton fields with serious dead seedlings, the method of shifting the strains in parallel can be adopted to ensure that the rate of missing cotton plants in one row does not exceed 10%. For cotton fields that are too large to be transplanted or the cotton seedlings are too long to be recovered, they should quickly make up for the loss of seedlings by supplementing large seedlings, or regenerate seeds in a timely manner to increase planting density. As long as late-planted cotton can strengthen management, it can also achieve high yields.
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