Improve the fruit set rate of watermelon

September 24 11:25:54, 2025

1. Artificial Pollination: To improve the fruit set rate of watermelons, artificial pollination is an effective method. When the male and female flowers open (between 6 am and 9 am), collect pollen from the male flowers by removing the petals and gently brushing it onto the stigma of the female flowers. Each male flower can be used for 3–4 female flowers. Be careful not to touch the ovary with your hands, as this may cause mechanical damage. Use a soft brush to collect the pollen from the male flowers and apply it to the female ones.

2. Stalk Manipulation: A common practice in melon farming is to "back cough" before the fruit sets. When the young melon appears, gently press the stem behind the fruit with your fingers. If you hear a slight "cough" sound, it indicates that the fruit is beginning to form. This technique helps ensure that the fruits develop evenly in all directions.

3. Using Acetic Acid: Prepare a solution by dissolving 1 gram of acetic acid in 30 grams of alcohol, then dilute it with 24 kilograms of water to create a concentration of 4010-6. Apply this solution using a clean brush or sprayer to young watermelon fruits when they are about the size of a walnut. The solution helps prevent fruit drop and stimulates cell division, promoting healthy growth. If applied during the pre-flowering stage, it can also speed up female flower development and early fruit formation.

4. Cytokinin Spraying: Applying cytokinin during the flowering stage significantly improves the fruit set rate, increases sugar content by 1.5–2 degrees, and boosts yield by 27–30%. It also helps reduce disease and promotes earlier maturity. The recommended application is to spray at a 500-times dilution when the vine has 5–8 tendrils, starting in late May or early June. Repeat the spraying every 5 days, for a total of four times, with the last application around June 20.

5. Gibberellin Spraying: Once the watermelon reaches the size of a walnut, spraying gibberellic acid at concentrations of 2010-6 to 3010-6 can greatly enhance the fruit set rate, improving overall productivity and fruit quality.

6. Vinegar Spraying: Spraying diluted vinegar (at a 500-times concentration) when the watermelon has 1–2 true leaves and before flowering can increase the fruit set rate and produce larger, more mature fruits. This practice can lead to a 30–35% increase in yield and helps the watermelons mature 5–6 days earlier.

This detailed guide provides practical techniques to enhance watermelon production through natural and chemical methods, ensuring better yields and higher quality fruits.

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