Remedial measures of cotton after waterlogging

Cotton has the ability of self-regulation and compensation, and stress-resistant cultivation measures such as drainage, early loosening soil, heavy fertilization, late topping and strong pruning should be taken after the disaster.

Scramble for drainage: surprise lower the water level of the outer three ditches, focusing on dredging and deepening the three ditches in the cotton field. In areas with low-lying terrain and high inland water level, it is necessary to use mechanical and electrical drainage to speed up drainage and reduce the underground water level in cotton fields.

Early loosening soil: after waterlogging, the soil consolidation and permeability of cotton field is poor, so it is necessary to suddenly loosen the soil 7-8 days after drainage, improve soil permeability and temperature increase, and speed up the growth of cotton seedlings.

Heavy fertilization: the flooded cotton plants should apply recovery fertilizer in time after the wilting was eliminated and the fertilizer absorption capacity of the roots began to recover, and increase the amount of fertilizer application, quickly promote the fierce attack, and turn to the peak period of increasing nodes, buds, blossoms and bolls as soon as possible. In general, 5kg of pure nitrogen is applied per mu, mainly urea or ammonium bicarbonate, combined with potash fertilizer and organic fertilizer, and the application of special compound fertilizer for cotton is advocated. Deep application in open ponds to improve fertilizer use efficiency.

Late topping: the growth period of flooded cotton plants is postponed after resuming growth, and the topping time should be postponed appropriately, which is generally 6-7 days later than the usual topping time. In this way, we can make full use of the growth advantage of cotton after the disaster and increase the number of fruit branches and peaches.

Strong pruning: during the recovery period of flooded cotton plants after drainage, the latent buds of the leaf nodes below the original fruit branches will develop into leaf branches, and at the same time, the latent buds on the fruit branches and leaf nodes of the main stem will also grow into larger buds, so it is necessary to strengthen pruning in order to reduce nutrient consumption and ensure that bolls have a sufficient nutrient base in the later stage.

The seriously affected cotton fields should be replanted or replanted in time if the number of cotton plants per mu is less than 300, and those with more than 300 plants per mu should be interplanted. Replanting and interplanting should follow the principle of "benefit first and does not affect autumn sowing". If it needs to be replanted, the following schemes can be adopted: first, autumn corn is interplanted with green leafy vegetables. The mid-early maturity variety of corn is selected, and the fast-growing vegetable variety with short growth period is selected for interplanting vegetables, and the corn is harvested after one season, which does not affect the autumn sowing. The second is to change to grow vegetables. Take advantage of the shortage of green leafy vegetables after the disaster, select fast-growing leafy vegetable varieties to strive for early market; you can also grow radish, Chinese cabbage and other vegetables that are more resistant to storage. The third is to plant fresh autumn soybeans. The fields with earlier effluent can be changed to fresh autumn soybeans and early and middle maturing soybean varieties can be selected. Interplanting cotton field to select crops with shorter plants and short growth period.