There are a lot of stresses on the transplanting of watermelon seedlings. 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 is always impossible to get rid of the characteristics of the watermelon itself.
1. Watermelon is hot and not very cold-resistant. When the temperature drops to 15 °C, it grows slowly, stops growing at 10 °C, and suffers cold damage at 5 °C.
2. Hi water, but afraid of wet, drowning more than 12 hours will die;
3. Hi light, very sensitive to insufficient light, manifested as internodes, petiole, leaf body lengthening, leaf color becomes shallow, susceptible to disease;
4. It is advisable to choose loam or sandy loam with deep soil layer, fertile sulfur and good drainage;
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?
Seedlings are generally started around the Spring Festival, and transplanting and planting began in March, with slight differences in different regions. Robust seedlings have a direct impact on planting survival, flowering fruit setting and yield. However, the temperature is low before and after the Spring Festival, the rainy and snowy weather, and the light is weak, which is unfavorable for the growth of the seedlings.
Do well in insulation measures, such as heating the bulb or electric heating wire, cover the grass mat on the grass shed at night, so that the temperature of the seedbed is not lower than 10 °C; strengthen the humidity control in the shed, uncover the small shed film, and let the nutrient water hold at 65%. Left and right, the relative humidity of the air in the shed is 50%~60%. When the nutrition is dry, it can be applied with 1000 times of water to promote rooting and not grow.
The normal age of transplanting watermelon is four-leaf stage. Because of the small amount of growth, the adaptability and resistance to the outside world are poor, and the seedlings are slow. However, the large seedling age above five leaves will cause poor results such as rooting and hollowing of the outer epidermis of the stem and the stem of the ground. 5~7 days before planting, the seedlings can be started, the daytime ventilation time is prolonged, the temperature of the seedbed is gradually reduced, the rooting can be promoted, the anti-freezing and disease-resisting ability of the melon seedlings can be enhanced, and the survival rate of the melon seedlings after transplanting can be improved. 1 to 2 days before transplanting, it can be sprayed with micro-compensation power 800 times, with fungicides, anti-rotation leaves, promote strong seedlings, and improve frost resistance.
The seedling bed should pay attention to prevention of tripping and blight, and it can be used to prevent the drug after emergence. It can also be added with fungicide and micro-replenishment energy when watering.
Precautions for transplanting watermelon seedlings
Suitable seedling age is 25 to 30 days, and it is not good to be too early or too late.
Before the transplanting of the appropriate seedlings and seedlings, in order to adapt the seedlings cultivated under the protective facilities to the environment of the field, it is necessary to cool and control the melon seedlings about one week before the preparation of the planting, that is, the refining of the seedlings and the cultivation of the seedlings promote the watermelon Seedling tissue aging, improve adaptability and stress resistance.
The timely planting of watermelon seedlings should be carried out in the morning in the morning, and the ground temperature should be raised as much as possible to promote the rapid growth of new roots and slow seedlings. If the low temperature weather planting seedlings or continuous low temperature weather after planting seedlings, it is easy to cause watermelon roots or dead seedlings. Generally, at a temperature of 10 cm, it can be colonized when it reaches 15 °C or higher.
The depth of planting the seedlings is suitable for the depth of the soil. The surface of the nutrient soil is about 1 cm buried in the soil. The soil temperature and poor ventilation are too deep, and it is not easy to moisturize. These will affect the development of watermelon roots, resulting in slow growth of watermelon. When the grafted seedlings are planted, the grafting interface should be at least 1~2 cm above the ground. Planting too deep makes the hypocotyl part of watermelon (scea) contact the soil and produce self-generated roots, making grafting meaningless.
The day before the planting of pests and diseases, the water can be poured once to prevent the watermelon seedlings from dying when the seedlings are mixed. At the same time, the seedbed sprays 79% of methyl thiophanate-wet WP 800 times solution and 40% dimethoate emulsifiable concentrate once to prevent pests and diseases, eliminating the trouble of spraying after transplanting the field.
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