When the watermelons become large and well-developed, it's recommended to apply 30 kg of urea and 10 kg of potassium dihydrogen phosphate per mu as a base fertilizer. After that, you can top-dress the plants once or spray them 2-3 times depending on their growth condition, using a mixture of urea and potassium dihydrogen phosphate for better nutrient absorption.
It's important to remove the first set of fruits promptly after they appear, allowing the second set to develop. Avoid letting the plant produce too many small fruits, as this can lead to early aging and reduce overall yield.
To maintain proper soil moisture, especially during cooler morning and evening hours, ensure consistent watering. To prevent water evaporation, cover the root area with wheat straw, leaves, or weeds. Once the fruit has set, gently press the soil around the plant under the mulch to create a small basin. This helps collect rainwater, which can then seep through the hole at the base of the plant to reach the watermelon's roots. Additionally, you can use high-efficiency drought repellents and water-retaining agents for extra protection.
Early prevention of diseases is crucial. Based on local conditions, apply targeted sprays before or at the early stages of disease outbreaks. For watermelon blight, you can use mancozeb diluted 600 times, Amisidae at 1500 times, or antiviral agent at 500–700 times. For anthracnose, spraying with 800–1200 times World High, 600–750 times Miconazole, or 50% Carbendazim at 500 times is effective. For Fusarium wilt, irrigate the roots with 800–1000 times solution of 70% Chlorothalonil (250 ml per plant), or mix 10 g of Chlorothalonil powder with 200 g of flour, add water to make a paste, and apply it to the base of the plant. You can also use an 800-times diluted Shile solution or 400-times diluted Sclerotium Net solution for irrigation. For virus diseases, spray Aktai at 3000–5000 times during the aphid season to control the spread. At the first sign of infection, use A500 times virus treatment to manage the disease.
To protect the watermelons from sunburn, cover them with shade nets, leaves, or dry weeds. This helps keep the fruit cool and prevents damage from intense sunlight.
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