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Stems and leaves withered
The watermelon seedlings grew normally in the early stage. Before and after the flowering period, the leaves suddenly appeared wilting, the stems were soft and stagnant, the young flowers withered prematurely, and the young leaves wrinkled and stretched. In severe cases, the stems and leaves were dry. The reasons are: First, even after the rain, the soil temperature decreases. After the weather suddenly clears, the temperature rises. The ability of the damaged roots to absorb water deteriorates, causing physiological drought. Second, some plants prematurely produce melons when they encounter a period of low temperature and low light. After the supply of nutrients was in short supply, the plants collapsed. Third, when the melons meet successive droughts, the fertilizers are difficult to be decomposed and released, and there are also phenomena of premature aging. Fourth, some diseases such as wilt disease, blight, and bacterial wilt Diseases and other invasion hazards, pathogens destroy cells causing catheter blockage, so that the whole plant withered.
Response measures: First, improve and clear the melon field drainage system to ensure that the drainage system can be filled and filtered so that the root system of watermelon can grow robustly, transport water in time to ensure the normal growth of watermelon stems and leaves, and secondly, control the melon stage. Can not let the plant prematurely melon; Third, to premature aging of the watermelon topdressing 25-30 grams of urea, foliar spray 1% urea and 0.2% -0.3% of potassium dihydrogen phosphate mixture; four to have Bacterial wilt disease increased potassium fertilizer, spray copper preparations, etc. for prevention.
Actress
The so-called open-minded, that is, regardless of the main vine or branch of watermelon, only long vines, although flowering but not melon, this is also called "flowers but not real." Such watermelon plants generally have vigorous growth of stems and leaves, thin leafy leaves, long petiole, small flowers, leaf length greater than the width, petiole length greater than the length of the leaf, the top tender tip. The reason why this situation occurs is mainly due to the excessive amount of nitrogen fertilizer, especially the excessive application of ammonium bicarbonate in the base fertilizer. In the case of rainy and hot weather, vegetative growth will inhibit reproductive growth.
The first step is to press the prosperous main vines and press the leaves once every 4-5 times. Second, the vines should be pressed in the afternoon to prevent the vines in the morning from being brittle and the vines should be broken. The third is Do not press the soil before and after sitting on the melon section to ensure the normal supply of fertilizer and water. Fourthly, it is necessary to carry out toppings on the vines that are particularly busy, and use lateral vines to ease the growth potential and promote fruiting.
In addition, plant malnutrition, incomplete flowering of female flowers, improper spraying of pesticides during the flowering time, or spraying of fertilizers outside the roots, and encountering bad weather, will lead to the emergence of empty crops in some fields. In production, attention should be paid to formulating balanced fertilization. Spraying and spraying fertilizer should be performed after watermelon pollination. Experienced farmers can conduct artificial pollination after heavy rain and heavy rain, which is very effective for improving fruit set rate.
Watermelon dry and empty due to improper management of fertilizer and water
With the promotion of facility cultivation, the annual supply of watermelon is no longer a problem. In the vegetative and reproductive stages of watermelons, some farmers often report that some watermelons only have long vines that do not sit on melons, and some even have lingering, shrinking, and finally die in the early stages of childbirth. Guaranty has caused some disputes with the sales units due to these problems. We have learned from large-scale watermelon production surveys that, except for a very small number of imported watermelon varieties that do not adapt to the local climate, resulting in reduced production, most of them are due to physiological disorders caused by improper management of fertilizers and water, and the following abnormal performances are common: