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Partial application of nitrogen fertilizer can indeed promote the rapid growth of the main stem and leaves of the cotton. The long-term growth of the cotton is the thick green leaf hypertrophy. In the red (color) green (color) ratio of the stem, 70% to 80% are green, and the main stem The distance between the nodes is elongated, and the average daily growth of the main stem at the budding stage can reach 2 to 3 cm. The most prosperous cotton plants still have more than 3 cm. The width of the functional leaf of cotton is generally 16-18 cm, and the most is more than 20 cm. The cotton with high density also has a similar appearance. In this part of the cotton field, the nitrogen nutrients applied are mostly consumed in the vegetative growth. When the cotton nectarine needs a lot of nutrients, the cotton leaves will soon fall yellow and the stamina is obviously insufficient.
Regarding potash fertilizer, transgenic hybrid insect-resistant cotton is very sensitive to potash fertilizer. Compared with conventional cotton, potash fertilizer needs to more than double. Potassium deficiency can easily lead to physiological blight, and some farmers mistakenly believe that it is a blight. If the potassium deficiency is severe, the buds will show symptoms on the leaves and petioles. After concentration of peaches, lack of potash will reduce the utilization rate of nitrogen fertilizer. Second, it will reduce the weight of the boll. Three will weaken the resistance to wilt disease, and the fourth will cause the leaves to scorch and fall off earlier.
Peach fertilizer, for transgenic hybrid insect-resistant cotton, is particularly important for enhancing the stamina of cotton. Because of transgenic hybrid insect-resistant cotton, there are characteristics of concentrated peach. If there is a large amount of peaches in the cotton during the anaphase, the fertilizer will be insufficient, which will inevitably affect the peach yield of the avocado. If there is not enough peach fertilizer, the upper fruit branch will not stretch, and the cotton plant will have symptoms of premature aging.
As for the moisture problem, drought and waterlogging will inhibit cotton root development. Cotton sprouts first, and bad plants first decay. Any poorly rooted cotton will decay faster than normal cotton.
Diseases and insect pests can cause premature senescence, especially in the field of verticillium wilt, stem blight, and cotton fields damaged by red spider mites and cotton grasshoppers. Cotton leaves are damaged and the organs that make nutrients are damaged. Premature aging is self-evident.
To prevent premature aging of cotton, we must first start with scientific fertilization. First, the base fertilizer should be applied organic fertilizer or bio-organic compound fertilizer, not less than 50 kilograms of bio-organic compound fertilizer per mu, or 25 to 30 kilograms of nitrogen-phosphorus-potassium compound fertilizer with high content; the second is the increase of potassium fertilizer, a lot of per acre. In 30 kg, respectively, in the base fertilizer and Sheng Lei period application, the amount of compound fertilizer applied to reduce it; the third is after the peach, but also twice the application of urea, 25 kg per gram of urea. With these fertilizers to lay the foundation, high yields and stable production of cotton can be achieved without premature aging. It can also suppress and enhance resistance to cotton brown wilt. Followed by pest control, prevention and control of red spider mites, cotton mealybugs, many kinds of pesticides, the key is to be based on the local insect report, do a good job in group defense group governance.
Prevention and treatment of premature aging of cotton
The premature aging of cotton has occurred in varying degrees every year. However, this year's area is relatively large, and there are more farmers who pull cotton stalks earlier. The cause of premature aging is caused by a variety of comprehensive factors. For example, some cotton fields have applied nitrogenous fertilizers, some have not used less potassium or potash fertilizers, some have insufficient peach fertilizers, some have some waterlogging, some have high density of cotton fields, and some have serious diseases and pests. But the main factor is that some fertilization techniques have made mistakes.