The field management of wheat and cotton should keep up with it.

First, the growth characteristics of wheat interplanting cotton. In view of the characteristics of wheat cotton intercropping, cotton seedlings after wheat are thin, slow in growth and development, late budding and flowering, easy to grow in the middle stage, and easy to mature late in the later stage, and the cotton seedling stage is affected by rainfall and low temperature, and the disease in the seedling stage is more serious.

The field management after wheat must be based on the word "early" and pay close attention to the word "grab" to promote the rapid growth and development of cotton seedlings so as to make up for the lack of growth at the seedling stage.

Second, snatch out the stubble and loosen the soil. Wheat interplanting cotton field has heavy soil consolidation, weak seedlings and serious disease, so killing stubble and loosening soil is the most important link of field management. In order to promote the early development of strong seedlings, we must first promote root growth. After wheat, the stubble loosened the soil, broke the soil consolidation, reached 7-10 cm deep ploughing between rows, 3-4 cm shallow hoe between plants, and the soil around cotton seedlings was loose and ventilated, which could effectively reduce the disease and had a good effect on promoting the early development of strong seedlings.

Third, snatch and pick up the fat of seedlings. Most of the soil nutrients in wheat-intercropped cotton field are consumed, and the nutrients needed by cotton seedlings are deficient, which seriously affects the growth and development. Generally, 7-9 kg of urea is required per mu, and 1000-2000 kg of rotten high-quality soil fertilizer is needed for plots with insufficient base fertilizer to promote the rapid growth and development of cotton seedlings.

Fourth, rushing and watering to promote seedlings. In Huang-Huai region of China, there is a long period of drought after wheat harvest, and the soil moisture in wheat and cotton fields is often seriously insufficient. The field capacity of 50 cm soil layer is mostly less than 50%. It is necessary to cooperate with topdressing and pour water to promote seedlings once in time, so as to promote fertilizer with water and preserve water with fertilizer. Implement interrow ditch watering, do not flood irrigation, timely ploughing to preserve soil moisture after watering.

Fifth, rushing and curing pests. The field pests of wheat and cotton in seedling stage are generally more and more serious than those of pure cotton. Corn borer, cotton bollworm, red spider and other pests on wheat transferred to cotton after wheat harvest.

After wheat harvest, we should seize the time to do a good job in field pest investigation and control. Pyrethroids pesticides with high efficiency and low toxicity can effectively control corn borer, cotton bollworm, red spider, cotton aphid and other pests. When the conditions are available, Bt diluent spray can be selected, which not only has a good control effect on corn borer and cotton bollworm, but also does not pollute the environment, which is worth popularizing according to local conditions.