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?
Watermelon growth characteristics
No matter what kind of watermelon, it cannot always be separated from the characteristics of watermelon itself.
1. Watermelon is hiy hot and extremely cold-resistant. When the temperature drops to 15°C, it grows slowly, stops growing at 10°C, and is chilled at 5°C;
2. Hi, but afraid of wetness, died after flooding for more than 12 hours;
3. Hi light, very sensitive to the lack of light response, manifested as internodes, petiole, leaf body becomes longer, lighter leaves, susceptible to disease;
4. The loam or sandy loam soil with deep soil, fertile sulfur and good drainage should be selected.
5. The pH value of the soil is not strict, and it can grow in the range of pH 5~8.
When is the watermelon seedling transplanted and planted best?
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%. When the nutrition is dry, it can be used to pour 1000 times water to promote rooting without being too long.
The proper age of transplanting watermelon is four leaf stage. Seedlings because of small growth, adaptability and resistance to the outside world, slow seedling slow. Larger seedlings with more than five leaves will result in adverse effects such as woody stemming and hollowed pith in the roots and in the ground. 5 to 7 days before planting can start hardening seedlings, extend the ventilation time during the day, so that the seedbed temperature is gradually reduced, can promote rooting, enhance the melon seedlings antifreeze resistance, improve the survival rate of melon seedlings after transplanting. One to two days before transplanting, it can be used to spray 800 times the force of micro-compensation, with fungicides, prevent rotten leaves, promote strong seedlings, and improve frost resistance.
Seedlings should be controlled on the seedlings to prevent stumbling and blighting. After emergence, they can be used for prophylaxis. It is also possible to add fungicide and micro-energetic water to pour on watering plants.
Watermelon seedling transplant precautions
Appropriate seedling age to 25 to 30 days is appropriate, too early or too late are not good.
Appropriate seedlings before transplanting seedlings in order to enable the seedlings cultivated under protected facilities to adapt to the environment of the field, in the preparation of a week or so before planting needs to cool the seedlings, water control treatment, that is, hardening seedlings, hardening seedlings to promote watermelon Seedling tissue aging, improve adaptability and stress resistance.
Transplanting watermelon seedlings in proper time should be conducted in the morning in sunny weather, and try to raise the ground temperature 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.
Appropriate depth planting seedlings seedlings planting depth of about 1 cm in the soil buried soil surface is appropriate, too deep soil warming and poor ventilation, too shallow to moisture, which will affect the watermelon root development, resulting in slow growth of watermelon. 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.
The prevention and control of pests and diseases can be irrigated one day before the seedlings are planted 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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