During the late growth stage of mulching watermelon, due to defertilization, squashing, loss of pods, diseases, pests, sunburn and other causes of premature aging, the plant growth weakens, the growth is slow, the upper leaves are thin, the leaves are light green, the leaves are thin, and the lower leaves become brown , The weight of melons, the decline in quality, and the large area of ​​production cuts should be taken in response to different situations.
Timely fill fertilizer watermelon base fertilizer applied more than enough, but due to earlier cultivation and cover film, high ground temperature, fast decomposition of fertilizers, plants absorb more, loss is also larger, so often after dehydration after sitting melon, resulting in the late growth of watermelon Premature aging. When the watermelon grows to an egg size, 10 to 15 kg of urea and 5 to 6 kg of potassium sulfate are applied per acre with water. After that, fertilizer can be top-dressed again according to the growing conditions of the plants. Alternatively, potassium dihydrogen phosphate or urea can be sprayed. .
Baozao watermelon watermelon period has the biggest requirement for soil moisture content. During this period, the outside temperature is high. In addition, when the plastic film is covered and cultivated, the root system is shallow, the soil is easily lost, and the water content is too low, causing premature aging. To prevent loss, wheat straw and leaves can be covered in the roots of the plants. After sitting on the melon, the virtual soil under the film around the plant is pressed down to form a small pit. When it rains, it can make the rain seep through the pellicle hole at the base of the plant to the root of the melon root. In addition can also be sprayed with high-efficiency drought-resistant agents, water-retaining agents. When watering, select early morning and evening when the temperature is low.
Prevention and control of pests adhere to the principle of "prevention as the mainstay and comprehensive prevention and control". In the early stage of disease, various drugs can be targetedly sprayed. Fusarium wilt can be formulated with 50% carbendazim or 70% thiophanate-methyl for 1:50 soil and applied to the soil before planting. In the early stage of disease, 70% of the enemy can be used to irrigate the roots of 800 to 1000 times. Anthracnose can be sprayed with 80% anthrax 800 times. For viral diseases, spraying 10% imidacloprid 200 times in time to control field-transmitted viruses of aphids and slugs. In the early stage of disease, spray 20% virus A wettable powder 500 times, 7-10 days, 2 or 3 times in succession.
Anti-irrigation membranes in the late growth stage of watermelon often cause premature senescence due to high-temperature burned vines. Therefore, the melon roots of melon roots and melon vines should not be over-completed, so that they can provide proper coverage and supportive functions. , can not fight.
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