During the late growth period of mulching watermelon, due to reasons such as defermentation, sitting in the early stage, loss of pods, disease, and sunburn, premature senescence often occurs, and corresponding measures should be taken for different situations.
First, timely supplement fertilizer. When the watermelon grows to the size of an egg, Mu recovers 40 kg of urea and 5 kg of potassium dihydrogen phosphate. According to the growth of the plant, fertilizer may be applied once or sprayed 2-3 times, and a mixture of urea and potassium dihydrogen phosphate may be used, or sprayed with pomposity, foliar and so on.
Second, do not leave the first melon. The first melon is removed immediately after sitting, and the second melon is left. The sub-grapes do not allow them to produce melons, which can effectively prevent premature aging.
Third, guarantee the public opinion. Water in the morning and evening when temperatures are low. To prevent loss, cover the roots of the plants with grass. After sitting on the melon, the virtual soil under the film around the plant is pressed down by hand to form a small basin. When it rains, it can make the rain seep through the pellicle hole at the base of the plant to the root of the watermelon. In addition can also be sprayed with high-efficiency drought-resistant agents, water-retaining agents.
Fourth, early prevention of disease. Adopting the principle of “preventing stress over treatment†and “treating early, treating smallness, and treating the diseaseâ€, according to the actual conditions of the local morbidity and vulnerability of local watermelons, various pesticides can be targetedly sprayed before or at the onset of the disease. For watermelon anthrax, spray 50% carbendazim WP 500 times, or 50% anthraquinone WP WP 300-400 times. For watermelon wilt disease, 50% carbendazim or 70% thiophanate-methyl chloride 1.3 kg can be used to create a 1:50-fold medicinal soil, which is applied to the soil before planting. In the early stage of disease, 70% of the enemy can be used to irrigate the roots of 800-1000 times, 250 ml per plant, or use 10 grams of the enemy's original powder to mix in 200 grams of flour, add water to make a paste, and apply it to the base of the plant. Or irrigate the roots with either antibiotics or double action. For watermelon virus disease, it can be sprayed with 10% once-off (imidacloprid) 2500 times to kill the virus-borne aphids and spurts. In the early stage of the disease, a mixture of 500 times the virus and 800 times the enemy of the yellow leaf was sprayed, once every 5-7 days, and sprayed 2-3 times.
Fifth, prevent day burns. Can be used to cover the surface of watermelon leaves, weeds, etc. to prevent burning.
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