The so-called coated cotton seed is the product that is obtained by removing the short cashmere after the use of the fine cotton seed with dilute sulfuric acid, and then coating with a seed coating agent containing a bactericidal drug and a modifier. According to our investigations in some farmers in the cotton district all year round, some cotton seedlings do experience dead seedlings. Most of them are dead seedlings, and other diseases and mismanagement of physiological seedlings.
The main reason is that the improved varieties do not use well-supported methods. The specific performance is as follows:
First, after the cotton seeds were sowed in the seedling bed of seedlings, no topsoil was sprayed and sterilized on the topsoil and cover cotton seeds.
Second, the watering of the cotton seeds after sowing is too much, and some repeated watering causes bad kinds;
Third, excessive use of basal fertilizer, soil liquid concentration is too large, the occurrence of reverse osmosis injury seedlings, or the application of urea as a base fertilizer so that cotton seed dehydration and rotten species, which is often said that the fertilizer damage;
Fourth, if the seeding depth of the cotton seed is too shallow or too deep, the normal growth and development of the cotton seedling will be inhibited, resulting in dead seedlings;
Fifth, after the cotton seedlings had been discharged, pesticides were not sprayed in time to prevent the invasion of the bacteria to protect the cotton seedlings, or the cotton seedlings were burned at excessive concentrations and caused death caused by phytotoxicity.
Sixth, prematurely uncovering the plastic film or retracting the film prematurely has caused the young cotton seedlings to suffer from frost damage and become dead seedlings.
In view of the above, in order to play a good role in the finishing of coated cotton, it is necessary to understand the type of coated cotton, and then do a good job of supporting the application of technical measures.
First of all, we must understand the role of coated cotton seeds. After the cottonseed has been coated with foam acid, it has already killed the bacteria attached to the cotton seed, enhanced the disease resistance of the cotton seed, and has a significant advantage over the uncoated cotton seed. However, the resistance of the coated cotton seed species is limited, not a package. The germs transmitted by the soil and external forces must also be controlled to ensure the early emergence of cotton seedlings.
Second, we must grasp the supporting application technology. First, to increase the maturity of organic fertilizer, to avoid partial application of nitrogen fertilizer to promote long seedlings, weaken cotton seedlings; Second, with good cotton seedbed nutrient soil, discretionary phosphorus, potash. To ripen eucalyptus soil, it is beneficial to protect water filtration and prevent root rot. The third is to spray pesticide on eucalyptus and cotton seedlings. One can use 25% of Shiloyoshi seed coating agent 10 ml, and watering 10 kg of spray bed. Soil, the second can be used 12.5% ​​phosgene, with the addition of Paul (0.01% bryozoie lactone) solution to disinfect the seedlings, three can be used half-type Bordeaux mixture sprayed seedlings, four can be used 30% yammycin Ling agent 1000-1500 times liquid spray Application or irrigation roots.
The third is to ease the growth of cotton seedlings by the stiff seedlings. For phytotoxicity, fertilizer damage caused by rigidity, stagflation of cotton seedlings, one can use Huimanfeng or Zhuang Fu Xing active liquid fertilizer, 100 ml per acre, watered 60 kg spray; two available 0.01% Paula ) or Tianfengsu spraying; three available Bi Hu WP, sprayed with 50 grams per mu 3 grams of water, can be used to resolve the "two evils" to restore the normal growth of cotton seedlings.
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