1.After slow seedling emergence：Drip irrigation  13-36-13+TE 3-5 kg/acre, one time.

2.Vining period：Drip irrigation  Fish protein 3-6 kg/acre, 2 times, with an interval of 7-15 days. 20-20-20+TE 3-5 kg/acre, one time.

3.The week before flowering：Foliage spray  EDTA-TE（Flower and fruit） 800-1000 times dilution, applied every 7-15 days, for a total of 2 times.

4.Young fruit's stage：Drip irrigation Seaweed fertilizer 3-6 kg/acre, with an interval of 10-15 days, for a total of 3-4 times.

Foliage spray  CA fertilizer 800-1200 times liquid per application, 7-15 days per application, continuous use.

5.Stage of expansion：Drip irrigation 12-6-42+TE/25-10-20+TE 3-5 kg/acre, continuous use with an interval of 7-15 days.

6.15 days before harvest：Drip irrigation Amino acid 3-5 kg/acre, one time.

Foliage spray  EDTA-TE（Green leaves）） 1000-1500 times liquid, used once.

80-80-80+HA：80：Improve the water and nutrient retention capacity of the soil for watermelon cultivation, and reduce the cost of fertilizer input.
0-60-340+TE：When encountering pests and diseases during the watermelon fruit expansion period, spraying 0-60-340+TE can not only supplement potassium fertilizer, but also have a fungicidal and protective effect.
19-19-19+TE：When the root system of watermelon is weakened and nutrient absorption is difficult, spraying Duogaoquan can quickly supplement the necessary nutrients for the current period.

Notes:
The amount, frequency, and type of topdressing should be adjusted according to specific circumstances.
Avoid excessive nitrogen fertilizer application during the watermelon vine elongation period, which can affect yield and quality.

Biological characteristics:
Watermelon belongs to the Cucurbitaceae family, with a strong root system and drought tolerance but not waterlogging tolerance. It has bisexual flowers on the same plant and its fruit is a pepo that develops from the receptacle. Watermelon is a warm-loving crop with a suitable growing temperature of 20-30 degrees Celsius; the germination period is 25-30 degrees Celsius, the seedling stage is 22-25 degrees Celsius, the vine extension stage is 25-28 degrees Celsius, the fruiting period is 30-35 degrees Celsius, and the temperature during the flowering and fruit-setting period should not be lower than 18 degrees Celsius. Watermelon is best grown in sandy loam soil, with a suitable soil pH value of 5.0-7.0, and can tolerate mild salt and alkali.

Fertilizer requirements:
Studies have shown that watermelon requires a large amount of fertilizer, with a nitrogen-phosphorus-potassium absorption ratio of 3.28:1:4.33. Watermelon is a crop that is sensitive to chlorine, and the use of chlorine-containing fertilizers can affect the quality of the produce and may lead to toxicity. In the fruiting period, watermelon can benefit from an appropriate increase in boron fertilizer, which can effectively prevent the fruit skin from becoming too thick or hollow while also significantly increasing yield and quality.