1. Fat is enough to be fat.
Basic fertilizer is a key step and an important foundation for high quality, high yield and sweetness of watermelon. During production, attention should be paid to applying sufficient basal fertilizer. The specific amount of fertilizer can be determined according to the local soil fertility and yield level.
Generally, 5,000-8,000 kilograms of decomposed high-quality farmyard manure, 100 kilograms of cake fertilizer, 35-50 kilograms of superphosphate, and 50-60 kilograms of three-element compound fertilizer (excluding chlorine) can be applied per acre. Jiamei Dividend Two bags, 8-10 pounds of brown sugar, combined with deep plowing and applying to the ground.
2. Top dressing skillfully.
During the whole growth period of watermelon, it is necessary to focus on applying seedling fertilizer, vine fertilizer, fruit setting fertilizer and fruit expanding fertilizer.
(1) Lightly apply seedling fertilizer: Generally, if the base fertilizer is sufficient, less seedling fertilizer can be applied, but for insufficient base fertilizer, 1-2 bags of 800 times liquid Jiamei Dividend should be topdressed per acre, and at the same time, the leaves Spray 1000 times liquid Jiamei Melatonin or Golden Point, and the fertilization time should be controlled after the seedlings grow 2 true leaves.
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(2) Apply fertilizer for strong vines skillfully: Fertilizer for strong vines should be carried out according to the growth situation. Generally, when the melon vines grow to 40-50 cm, it is combined with watering and topdressing with 1 bag of Jiamei Dividend Hailibao per acre. 2-3 kg 1-2 times, and spray 800 times liquid Jiamei Melatonin 2-3 times on the leaves at the same time to promote the growth of melon vines and lay a good foundation for later flowering and fruiting.
(3) Cleverly apply fruit-setting fertilizer: after flowering, it is mainly based on organic activated nutrients and nutrients such as phosphorus, potassium, calcium, boron, etc. Generally, 1 bag of Jiamei Dividend per acre will yield a profit of 5-6 kg 1 -2 times, spray gold dots, melatonin, etc. 2-3 times at the same time to increase the fruit setting rate of watermelon and reduce deformed melons, cracked melons, malignant transformation of melon pulp, sourness and unsweetness.
(4) Apply fruit-expanding fertilizer again: When the first batch of young melons grow to the size of eggs and lose their hair, topdress 1 bag of Jiamei Dividend 7-8 kg per acre 2-3 times. At the same time, spray the medium and micronutrient package Jiamei Melatonin 2-3 times such as iron, boron, manganese, etc. to promote fruit expansion and the accumulation of dissolved substances and sugars in the fruit.
3. Field water management.
The soil moisture should not be lower than 48% during the entire growth period of watermelon, but different development stages have different water requirements. After planting and before spreading, the melon seedlings need less water and evaporate less from the leaves. Watering should be controlled to promote the expansion of the root system. Appropriate top dressing and watering can be applied during the spreading period. Watering should be strictly controlled before and after flowering. When the melons grow to the size of eggs, , begins to enter the melon expansion period, and the water supply must be sufficient. In the near mature stage, less water is needed and watering should be controlled. From the spreading stage to the melon expansion stage, a certain amount of organic activated nutrients, nitrogen, phosphorus, potassium, calcium and boron, as well as medium and micronutrients such as Jiamei Dividend, Hailibao and Yinglilai are applied per acre in conjunction with watering. Usually, it is enough to water melons in greenhouses once with stretching water and 1-2 times with swelling water. Be careful not to use too much water when pouring expanded melon water to avoid causing diseases. Watering should be done in the morning and evening.