In the watermelon seedling bed, it is often found that there are some Tewang Miao in the large variety, the stems and leaves are thick and strong, and the growth is very prosperous. There are some weak seedlings in the small variety, the stems and leaves are weak, and the growth is very poor. These special seedlings are scattered in the middle of normal seedlings, and the ratio is generally 2% to 5%. This phenomenon is mainly caused by the presence of 5% of self-crossings in the hybrid seeds. Since the watermelon varieties currently used in production are basically hybrid generations, it is difficult to achieve a hybridization rate of 100% for hybrid seeds, and 2% to 5% of self-crossings are allowed by national standards. The size, quality, commerciality, disease resistance and other traits of the parent melon have a serious disadvantage compared with the normal hybrid melon. However, the self-crossings in hybrid seeds are still not identified, and can only be distinguished after seedlings, so they must be removed on the seedbed and before planting. It is a habit to keep the farmer's seedlings transplanted and transplanted, and the self-crossing seedlings in the small breeds can be eliminated because of the weakness. However, the Tewangmiao in the large variety is often mistaken as a good seedling and remains as a seedling. Therefore, it should be removed when planting, and the planting water should be timely poured after the watermelon is planted. Spraying a new high-fat film 800 times can effectively prevent the ground. The water does not evaporate, the moisture of the seedlings does not transpire, the pests and diseases are isolated, the seedling period is shortened, the new environment is quickly adapted, and the growth is healthy.
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