Four strokes to control the redness of cotton seedling stems

Recently, some farmers have reported that the stalks of cotton seedlings are red, the leaves are small and thin and grow slowly. It can be seen that the main roots of these cottons are underdeveloped, the lateral roots are less, and some tumors appear at the base of the stem. So what is the cause of this situation? The reasons are summarized as follows:

1. Herbicide phytotoxic factors. Two types of plots can cause herbicide phytotoxicity, and the first type is the old cotton field that is continuously cropped all the year round. Because of the perennial use of trifluralin and the large amount of use, the stems of the plants are small and short, and the proportion of red stems is large. The other type is the cotton field, the former crop is corn, and the corn field closed herbicide Ea mixture or Dinga mixture is used for years. Continuous use for many years, the herbicides remain in the field. When the summer precipitation is large, the field herbicides are low in the flow direction of the water, which shows that the cotton fields in the same area are strong and strong, low-lying or low-lying areas, and the plants are short. Thin, red stem cotton phenomenon.

2. Disease factors. Cotton blight is based on the period and severity of the damage. Among them, there are purple-red in the field, and the cotyledons and true leaves become purple-red or purple-red plaques, slightly wilting.

3. Soil or salt or alkali. Some plots do not apply organic fertilizers due to long-term unreasonable application of chemical fertilizers, resulting in soil salinization or secondary salinization. When the rainfall is small, the salt is moved upwards. The concentration of salt greatly inhibits the absorption of nutrients by the roots. The phenomenon of salt damage and seedlings occurs, and the growth of the plants is slow and small, and the proportion of red stems is high.

Prevention:

1. If the stalk is red, it is the old cotton field with severe disease for many years. In the second year, it can be cropped with crops such as gramineae or legumes. In other words, such a rotation is the best measure if conditions permit.

2. For dwarf plants that have already developed diseases, spray the fungicide in time and spray with high-quality foliar fertilizer. It can also be better than the spray on the diseased plant, and then rooted every 5-7 days.

3. For saline-alkali or secondary saline-alkali soils, it can be improved by adding organic fertilizer for several consecutive years. Once the phenomenon of small salt “hook salt” appears, fresh salt water is used to reduce salt damage.

4. For the poor growth of plants caused by herbicide phytotoxicity, immediately spray "920" or Shuofeng 481 to add high-quality foliar fertilizer for relief. If conditions are met, watering should be timely, if the base fertilizer is insufficient or there is a symptom of de-fertilization, it is necessary to apply 12-20 kg of urea per acre combined with watering to promote plant growth.

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