2. soak the seeds. Soaking seeds can effectively shorten the germination time. Watermelon seeds need to be soaked for 8 hours because of their thick surface and poor water permeability.
3. Accelerate germination. The temperature required for accelerating germination is 29℃~30℃. Commonly used methods of accelerating germination are incubator, fire kang and human body. Considering the characteristics and convenience of watermelon seeds, it is suggested to use fire prevention to accelerate germination. The specific operation is to wrap the seeds with a wet cloth, then roll up the wet cloth and put it in a plastic bag, and put it under the bedding of the kang to germinate. Pay attention to adjust the position of seeds in real time according to the temperature. You can also put the seeds in the basin or at the edge of the basin to accelerate germination according to the principle of accelerating germination by fire resistance.
4. Raise seedlings. Seeding watermelon is divided into direct seeding and seedling transplanting. Seedling raising and transplanting can promote the healthy growth of seeds. In the process of seedling raising and transplanting, nutrition pots should be used to avoid damaging the roots of plants as much as possible. Soil viscosity should be moderate, and decomposed cake fertilizer or farmyard manure can be used as fertilizer. The ratio of soil to fertilizer is 7:3, and appropriate amount of phosphorus, potassium fertilizer and bactericide are added.
5. Sow in time. Sowing can be done when the ground temperature in the planting area is above 65438 05℃, but the sowing time can also be selected according to the situation and planting method.
6. Matters needing attention when sowing. Sowing depth should be appropriate. According to the seed size, the depth of seed burial is determined, and the depth of big seed burial is appropriate, and the depth of small seed burial is shallow, and the covering soil thickness is about 1.5cm.
7. Watermelon seeds are flat melon seeds. When sowing, put it flat, which is helpful to reduce the emergence of covered soil and promote seed growth.
8. Don't sow when the temperature is too low. If possible, it is best to wait until the temperature of the seedbed is stabilized at around 25℃.
9. Keep the moisture at the bottom of the bed soil in a higher place, and then sow after watering. Put a seed in each nutrition bowl, cover it with a layer of fine soil and then cover it with a layer of film, which is beneficial to seed germination.
10, seedbed management. The seedbed temperature should be kept at about 30℃, and the temperature can be slightly increased after the seedlings grow heart leaves. In the early stage, the greenhouse can be covered with heat preservation materials at night to keep the seedbed warm, and the seedlings should be artificially kept warm when the cold current strikes.
1 1, planting density. Planting density depends on the variety. Generally speaking, the standard is 400~700 plants per 667 species.