Watermelon seedling transplanting and colonization has a lot of stress, many watermelon growers have many misunderstandings in transplanting and planting. When is the watermelon seedling transplanted and planted best? do we need to care something?
Normally, the nursery is started before and after the Spring Festival, and transplanting and planting are started in March. There are slight differences in different regions. Robust seedlings have a direct impact on colonization survival, flowering fruit setting and yield. However, the temperature is low before and after the Spring Festival, rain and snow, and weak light, which are negative for the growth of seedlings.
Do well insulation measures, such as light bulb or heating wire heating, cover the grass mat at night on the shed, so that the seedbed temperature is not lower than 10 °C; strengthen the humidity control in the shed, open the small shed film, so that the water holding capacity of nutrients is 65% About the relative humidity of the air in the shed is 50%~60%.
Seedling age is appropriate for 25-30 days. It is not good if it is too early or too late.
Before seedlings are transplanted, the seedlings cultivated under the condition of protective facilities can adapt to the environment of the field. It is necessary to cool and control the water of the seedlings about a week before the preparation of the seedlings. That is, the seedlings are promoted, and the seedlings promote the aging of the watermelon seedlings. , improve adaptability and stress resistance.
Transplanting watermelon seedlings should be carried out in the morning on sunny days, increasing ground temperature as much as possible to promote the rapid growth of new roots and slow seedling survival. If low-temperature weather is encountered in continuous low-temperature weather after planting seedlings or after planting, it will easily lead to the roots of watermelons or the freezing seedlings. Generally in 10 cm ground temperature, when it reaches 15°C or above, it can be planted.
Melon seedlings are planted to a depth of about 1 cm in the surface of the nutritious soil. Overheated soils have poor temperature and ventilation, and they are too shallow to moisturize. These can affect the development of watermelon roots and lead to slow growth of watermelons. When the grafted seedlings are colonized, the grafting interface must be at least 1 to 2 cm above the ground. Implantation is too deep to allow the watermelon (scion) hypocotyl to come into contact with the soil and produce roots, rendering grafting meaningless.
One day before planting seedlings, it can be irrigated once to prevent the death of watermelon seedlings caused by the accumulation of nutritious soil blocks. At the same time, the seedbed was sprayed with a 79% thiophanate-methyl WP 800 times solution and a 40% dimethoate emulsified solution once to prevent pests and diseases, eliminating the need to spray medicine after transplanting the field.
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