Careful fertilization improperly injured cotton

The phenomenon of sudden death of cotton after a large amount of cotton is indeed encountered frequently. There are four common symptoms of dead seedlings:

The first one is that after experiencing a long drought, cotton suddenly encountered heavy rains. Some cotton leaves showed red leaves from the base to the top, and then died, while 20 to 30 peaches remained on the cotton plants. This situation is the physiological disease of red leaf stem blight, which is caused by the potential potassium deficiency in the soil and the insufficient application of potassium fertilizer in the cotton field;

The second is that after a large amount of cotton is applied to the peach, due to the insufficient application of potassium fertilizer, the cotton leaves first appear pale yellow spots, then the leaves appear red spots, and finally the leaves are scorched, which is also the physiological blight caused by potassium deficiency. Almost every farmer in different places has different degrees of occurrence every year;

The third type is when the peach is applied to the cotton. Some farmers see that the weather is going to rain. Grab a large amount of urea before the rain. Because of the large amount of urea, it concentrates and dissolves, increasing the concentration of the soil solution and causing reverse osmosis. Phenomenon, damage to the cotton root system, so that the cotton leaf immediately burns within a few days and gradually die;

The fourth type is around mid-September. In the case of continuous rainy weather, the temperature is kept at around 25 °C. In some old cotton fields with frequent blight, it is easy to induce blight, and cotton plants with heavy susceptibility will die. The application of organic fertilizer and potassium fertilizer does not cause blight or the incidence is very mild.

The above-mentioned problems of late-stage cotton seedlings, the first three dead seedlings are caused by physiological disorders, and the fourth one is caused by the invasion of germs. In different cotton-producing areas, different degrees occur every year, which is closely related to improper fertilization. Related.

In response to the problem of dead seedlings in the late stage of cotton, we should take measures to prevent disease:

1. Anyone who grows insect-resistant cotton, especially hybrid insect-resistant cotton, should apply 60 kg of high-potassium fertilizer per acre, and apply base fertilizer and top dressing to ensure that there are 36 kg of potassium oxide per mu of cotton field.

Second, cotton peach fertilizer should be applied before the rain, or after the rain, must not be applied before the rain.

3. In the old cotton field with blight, it is necessary to apply the decomposed organic fertilizer or bio-organic compound fertilizer or high-energy organic compound fertilizer produced by the farmer in the base fertilizer, and at the same time, the potassium fertilizer can effectively improve the defense against blight. Ability to enhance the recovery function of cotton after illness. As long as these corresponding measures are implemented conscientiously, the potential of cotton for disease resistance and yield increase can be greatly explored.