How to Fertilize Watermelons for Sweeter Fruit? Master the Five Fertilization Methods

1. Farmyard manure method: When preparing the land and applying base fertilizer, apply plenty of farmyard manure with a complete nutrient profile, such as chicken manure and sheep manure. The watermelons grown this way are uniform in size, good in flavor, and high in sweetness.

2. Potassium bacteria method: Microbial inoculants containing potassium bacteria such as “Manyuanchun”, bio-organic fertilizer, and black-plus-white biological fertilizer are compound high-tech microbial fertilizers. Applied in stages with formulas throughout the entire growth period of watermelons, they can make the watermelon leaves dark green, the fruit shape regular, and the sweetness increase by 1 to 1.5 degrees.

3. Stevia method: Take 500 grams of stevia and 10 grams of soybeans, add 25 kg of water, soak until swollen, then boil until the water is gone. When the watermelon is flowering and setting fruit, apply in holes 13 cm away from the watermelon seedlings, at a depth of about 13 cm. The melons produced this way are large and sweet.

4. Boron-calcium spray method: Dissolve 150 grams of sodium borate, 50 grams of calcium chloride, and 1000 grams of sucrose in 100 kg of water thoroughly. During the watermelon expansion period, spray on a sunny afternoon, which can increase sweetness by 20 percent.

5. Rare earth spray method: At the 5 to 6 true leaf stage, early flowering stage, and expansion stage of watermelons, spray rare earth nitrate solutions of 0.03%, 0.06%, and 0.08% respectively on the leaves 3 times, using 75 to 100 kg each time, which can increase sweetness by 0.6 to 0.7 degrees.