Which cotton seeds can't be used?

The following cotton seeds cannot be used in production:

First, cotton seeds with serious susceptibility. Dry and verticillium wilt is one of the chronic diseases that restrict cotton production, and cottonseed is the carrier of pathogens. The germ can spread rapidly with cottonseed. Therefore, cotton varieties in areas with severe dry and verticillium wilt cannot be transferred to cotton areas that are susceptible to disease, and cannot be transferred to disease-free cotton areas.

Second, Fuqian peach and late autumn peach cottonseed. Fuqian peach and late autumn peach have poor growth and development, poor maturity, light boll, low seed germination rate and fragile growth.

Third, the cotton seeds peeled off peach. Some cotton farmers still have a bad habit of robbing and peeling peaches. Any cottonseed that has been peeled off from peach blossoms, because it is not fully matured, does not complete the post-ripening effect and must not be introduced to the market.

4. Sprayed ethephon cottonseed. Spraying ethephon can promote early maturity of cotton for 3 to 4 days, but damage to cottonseed is large, making cotton seed development incomplete and unable to be seeded.

5. Varieties with serious degradation. Cotton is a cross-border crop with an outcrossing rate of about 8%. Some cotton farmers have not replaced new varieties for many years. The purity of cotton seeds is only 70-80%, and the quality is seriously degraded. Continued use will lead to reduced production and degraded quality.

6. Cottonseed stored with pesticides and fertilizers. Some farmers have long-term storage of cottonseed, pesticides and fertilizers in a warehouse and have poor ventilation. The germination rate is reduced due to damage to cottonseed by toxic gases emitted by pesticides and fertilizers.

Seven, long-term storage of cottonseed. The average germination rate of cotton seeds is more than 80% for half a year. In the absence of low-temperature refrigeration equipment, the life and storage age of cotton seeds are negative.

8. Cottonseed that has been sunburned on the cement field. Cottonseed with higher water content on the cement drying field, due to strong breathing intensity, causes physiological dysfunction of cotton seeds, and some cottonseeds form dumb seeds and lose germination ability.

Nine, mechanical damage to excessive cottonseed. In the finished coated cotton, the mechanical damage rate should be controlled within 2%. Cottonseed with a seed sap rate of more than 2% is overly contaminated by the drug, which has a great influence on the germination rate. If the seed blasting rate is too high, it is not suitable for seeding.