09/10/2026
WATERMELON PRODUCTION
Why grow watermelon?
1. High market demand. More people now know the health benefits, and awareness driven by Dr. Mujajati Aaron has increased consumption.
2. Fast maturity. Suitable for both small-scale and commercial farmers.
3. Crimson Sweet is the main variety in Zambia and is widely sold in markets and along roadsides.
Best growing conditions.
Watermelon thrives in hot, dry weather. Day temperatures of 29°C to 35°C and night temperatures of 16°C to 21°C are ideal. This makes August to December the best planting window.
Cold and wet conditions cause poor germination, slow growth, poor fruit set, and leaf blight which reduces photosynthesis.
Hot areas such as Chirundu, Siavonga, Sinazongwe, Livingstone and similar regions produce sweeter fruit, especially when potassium is well managed.
Soil and land requirements.
- Soil pH: 6.0 to 7.0
- Soil type: Sandy to sandy loam with high organic matter. Watermelon is a heavy feeder.
- Land: Well-drained, full sun for at least 8 hours daily. Avoid waterlogging and low-lying areas.
- Crop rotation: Avoid fields that had cucumber, squash or pumpkin in the last 2 to 3 years.
- Choose land near roads and markets to reduce transport costs and damage.
Planting guide.
- Spacing: 1m between plants, 2m between rows. In one lima 50m x 50m you can have about 1,250 plants.
- Planting: 1 to 2 seeds per station at 2 to 3cm deep, or transplant seedlings. Dig planting holes 10 to 15cm deep on the drip line.
- Maturity: 85 to 125 days depending on variety.
- Yield: Expect at least 3 fruits per plant with good management.
- Mulch young plants to conserve moisture and control weeds. Water consistently but avoid waterlogging.
Pruning
- Maintain 2 to 3 vines per plant and remove excess vines.
- Remove dead, diseased, or infested leaves and shoots.
- Remove deformed and rotten fruits.
- For larger fruit, keep 3 to 4 well-shaped melons per plant.
- Do not prune when vines are wet.
Fertilizer program
- At planting: Apply Compound D in the hole and about 2kg of manure. Cover lightly.
- After establishment: Start foliar feeds such as Easygro Starter and Finisher, and top dress with CAN or Veg Mix Top 24 and 32.
- Follow a 14-day feeding schedule for best results.
- With good feeding, expect fruit weights of 10 to 15kg.
Pest and disease management
- Rotate fungicides and insecticides to prevent resistance.
- Avoid spraying during flowering when bees are active to protect pollination. Watermelon depends on insects for fruit set.
How to tell when a watermelon is ripe
- Tendril nearest the fruit turns brown and dry
- Ground spot changes from white to creamy yellow
- Rind becomes dull instead of shiny
- Thump test gives a deep hollow sound
- Rind resists light pressure from a fingernail
- General maturity is 75 to 95 days after planting depending on variety
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Blessings ..