Watermelon Seedling Problems and Measures

1, burning seedlings

Due to the excessive application of fertilizer in the process of preparation of nutritious soil for seedbeds, unfermented manure or high seedbed temperature. Shoots sprouted before the emergence of the melon shoots, and the melon buds showed garlic petals. They were small and large, no major roots or root hairs, and the main root surface was rust-yellow. After the emergence of the melon shoots, the seedlings were burned, and the cotyledons were water-deficient, small and dark green, with wilting or new leaves, yellow and white, and yellow heart seedlings. To prevent the seedbed from burning seedlings, it is necessary to control the seedbeds to use less chemical fertilizers, and not to use unfermented manure. It is best to use “Contiyet” to mix soil, generally 0.5-1.5 kg per square meter seedbed. Secondly, the seedlings in the burning seedlings should be frequently watered, and soil and shading should be changed in serious cases.

2. The growth point of melon seedlings is blocked

The main reasons are: (1) fertilizer damage or injury. The newly emerged guajava seedlings have a younger growing point. At this time, if the concentration of foliar spraying or spraying fertilizer is too high or the spraying amount is too large, it will easily cause phytotoxicity at the growing point and stop growing. (2) Cold and high temperature disorders. When the seedlings encounter bad weather, the temperature of the seedbed is too low, and it is prone to frost damage. The growing point is often frozen and it is missing. When the seedlings encounter sunny weather, the afternoon sun directly shoots the seedbed, making the temperature inside the bowl too high, especially in the seedbed humidity. In the smaller case, the growing point is easy to burn, and even young leaves are susceptible to water loss, dry cracking, and severe death. In particular, leaves near the shed film, the symptoms are more serious, commonly known as roasted seedlings. To prevent low temperature barriers, the soil temperature and the temperature of the greenhouse must be raised first. The main measures for preventing the roasting seedlings are watering the seedbed in time, ventilating it in the sunny noon, and lowering the temperature of the greenhouse and the nursery bed. The temperature should be maintained around 25°C during the day and at night. -18 °C, but also to avoid young seedlings suddenly see strong light. Impaired growth of melon seedlings is a physiological disease. In addition to the prevention of artificial measures, it should also be combined with chemical control. In the early stages of symptoms, it should be promptly sprayed “Kapok” 300 times, which can regulate the whole physiological metabolism of the melon seedlings, and is conducive to the promotion of cell division and root development of melon seedlings. Improve the physiological activity of melon seedlings and promote the normal development of growth points.

3, long seedlings

Also known as "high footed seedlings", it shows that the hypocotyl is slender, the petioles are long, the leaves are small, the leaves are pale, and the seedlings grow weak. The main reason is that the seedbeds are not able to ventilate or ventilate the seedbeds in time, especially when the seedlings spit out their hearts and do not pay attention to ventilation and cooling, and the seedbeds are caused by high temperature and high humidity. Therefore, in the process of seedbed management, ventilation and cooling must be timely.

4, seedlings melon seedlings easy to reverse

This is mainly the danger of seedling bed damping-down. The main reason is that the seedbed soil has low soil temperature, high humidity, insufficient light, cloudy rain, cloudy snow, and poor ventilation, which is not conducive to the growth of melon seedlings, which is conducive to the growth and reproduction of the plague bacteria. Therefore, it is not possible to pour seedbeds with cold water, pay attention to raising the soil temperature, reduce air humidity, and increase disease resistance of seedlings as effective measures to prevent the occurrence of damping-off.

In addition, it should be controlled with chemical agents. Once a knock-out disease occurs, it should be immediately treated with the pharmaceutical “Bai Tai” 1200 times to prevent the spread of the disease.

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