Potassium
Symptoms
Leaf edge scorch; small fruits with low sweetness.
Correction
Potassium-rich water-soluble fertilizers during fruit development.
Fruits · Citrullus lanatus
Watermelon fertilizer and nutrition guide
Short-duration crop: potassium and calcium for sweeter, firmer fruits with fewer disorders.
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About Watermelon nutrition
Watermelon is a short-duration, high-value summer crop. After vine establishment, potassium and calcium are the most important nutrients for fruit size, sweetness and rind strength, and fertigation lets growers match each stage precisely.
- Climate
- Hot, dry climate, about 24-30 °C during growth; grown mainly in summer and on riverbeds.
- Soil
- Well-drained sandy loam, pH around 6.0-7.0.
Stage-wise nutrient management for Watermelon
What the crop needs most at each growth stage.
Sowing & establishment
Phosphorus and organic manure for roots.
Vine growth
Nitrogen and potassium in balance; magnesium for leaves.
Flowering & fruit set
Boron and calcium for fruit set.
Fruit development
High potassium and calcium for size, sweetness and rind strength.
Common nutrient deficiencies in Watermelon
How to recognise them in the field and how they are usually corrected.
Calcium
Symptoms
Blossom-end rot and weak rind.
Correction
Calcium nitrate through drip.
Magnesium
Symptoms
Yellowing between veins on older leaves.
Correction
Magnesium sulphate through drip or foliar spray.
More fruits guides
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Exact doses depend on your soil test, variety and irrigation. Tell us your crop stage, area and location and we will recommend the right products and quantities.
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