1. Seeds "broken shell"
The seed coat of seedless watermelon seeds is thick and not full, so sprouting is very difficult and must be “broken shell†to successfully germinate. After the seeds are sterilized, they are soaked for 8-10 hours. Remove the water and mucus from the surface of the seeds with a dry cloth, and gently rub the umbilicus with the teeth. When the seedlings are planted, the seedlings will be erected vertically, and the seedlings will be opened so that they will open a small mouth, occupying about 1/3 of the length of the umbilicus. When pods are grown, they must be light and the seed coats must be small, so don't injure the kernels. You can also use the wire clamp to gently open the seed nozzle, or use a knife to cut the umbilicus on both sides, and perform “breaking shellâ€.
2. The germination and seedling raising temperature is higher. The temperature required for seedless watermelon sprouting is higher, which is about 3-5°C higher than that of diploid ordinary watermelon, ie 32-35°C is appropriate. Seedling temperature is also higher than ordinary watermelon 3-4 °C, therefore, in addition to the use of hotbed nursery, to strengthen the seedbed insulation work, such as the erection of wind barriers, thick straw or wheat straw and so on. In addition, in the management of seedbeds, the amount of ventilation should also be appropriately reduced to prevent the temperature inside the bed from falling too quickly.
3. Early seedling seedless watermelon seedlings grow slowly, growth is weak, early seeding should be sown earlier than ordinary watermelon. As seedless watermelons are more heat-resistant than ordinary watermelons, seedlings are often used in nurseries, such as electric hotbeds, hot pots, and heated greenhouses. Seeding period should be 3-5 days earlier than ordinary watermelon
4. After the fertilizer and water seedling attacked the seedless watermelon, the roots were well developed and the stems and leaves grew vigorously, so that the amount of fertilizer needed was more than that of the diploid ordinary watermelon. General Mushi soil miscellaneous fertilizer 4000-5000 kg, cake fertilizer 60-80 kg, calcium superphosphate 40-50 kg, 50 kg of ammonium sulfate or 30 kg of urea, 25 kg of potassium sulfate. Soil manure and phosphate fertilizer as a base fertilizer ditch application or acupuncture points, other fertilizers to do top dressing 3-4 times. Seedless watermelon seedling growth is slow, after the extension of vines, growth, speed up to the flowering fruit setting period is even more vigorous, this time If the supply of fertilizer and water is not proper, it is easy to cause runaways and it is difficult to establish results. Therefore, fertilizer and water should be properly controlled before the flowering of the female flower from the seedling "flipping tap" to the target node. It is advisable to water with a small amount of water. From 5 to 7 days after fruiting, after the egg size of the young fruit, the supply of fertilizer and water was increased, the fertilizer and water attacked, and the rapid expansion of the fruit was promoted.
5. Interspecies of ordinary watermelon due to the pollen of seedless watermelon. Without fertility, can not play the role of pollination, sit alone can not sit fruit; so seedless watermelon fields must be kind of ordinary watermelon varieties. In general, 3 rows or 4 rows of seedless watermelon intercropping 1 row of ordinary watermelon are used as pollination plants, and the ovary of seedless watermelon is expanded mainly by the stimulating effect of pollinating pollen. The skins of the selected ordinary watermelon varieties should have distinct characteristics from those of the seedless watermelon varieties in order to distinguish them from the seedless watermelons during harvesting.
6. The high-section melon seedless watermelon has a low fruit setting, not only small fruit, unfavorable fruit shape, thick skin, but also many kinds of seed shells, and colored hard shells, hollow and cracked fruit. Fruits that are suitable for fruit setting are larger in size, attractive in shape, with a thinner skin and less pods, and are not easily hollow or cracked. In the production, generally choose to leave the main vine on the third female flower (around the 20th) to stay in the melon.
7. Appropriate harvesting of early seedless watermelons is more time-critical than that of ordinary watermelons, and production is generally harvested earlier than ordinary watermelons. If the harvesting is too late, the fruit is likely to be hollow or fall, the flesh is easy to grow and become soft, the juice is reduced, the flavor is reduced, and the quality is obviously reduced. It is generally more suitable for 90% to 95% ripening.
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