Potato
Solanum tuberosum
About Potato
The potato is the world's fourth most important food crop and the leading non-cereal food crop. It produces more food per unit of water and land than wheat or rice, making it critical for food security in land-scarce and water-limited regions. Potatoes are grown in over 150 countries, from sea level to 4,500 m in the Andes. They are rich in vitamin C, potassium, vitamin B6, and provide quality protein. In Africa, potato is the fastest-growing food crop, expanding rapidly in East African highlands (Kenya, Rwanda, Ethiopia) where conditions are ideal. The Irish Potato Famine (1845-1849), caused by late blight, killed over one million people and drove mass emigration — a stark reminder of the consequences of crop disease.
Growing Conditions
Full sun — 6-8 hours minimum. Short day length promotes tuberization in most varieties.
500-700 mm per crop. Consistent moisture critical during tuber initiation and bulking. Avoid waterlogging (promotes late blight and bacterial wilt).
Loose, well-drained, slightly acidic loam or sandy loam. pH 5.0-6.5. Heavy clay causes misshapen tubers.
Optimal 15-20°C for tuber growth. Tuberization inhibited above 25°C in most varieties. Night temperatures below 15°C promote tuber development.
Moderate. High humidity combined with cool temperatures creates ideal late blight conditions.
Cool season crop — 90-120 days to maturity. In tropics, grown at higher elevations (>1,500 m) or during cool dry season.
Step-by-Step Growing Tips
Use certified disease-free seed potatoes — never plant grocery store potatoes
Cut seed tubers to 40-60 g pieces with at least 2 eyes, cure 2 days before planting
Hill soil around stems when plants are 20-30 cm tall to prevent tuber greening
Apply balanced fertilization — potassium is critical for tuber quality
Begin late blight fungicide program at row closure before symptoms appear
Destroy (desiccate) foliage 2 weeks before harvest to set tuber skin
Disease Risks to Watch
All diseases →Potato late blight (Phytophthora infestans) causes dark water-soaked lesions on leaves and stems, with white sporulation underneath. Tubers develop firm brown rot. Apply preventive mancozeb or chlorothalonil sprays from row closure, destroy infected foliage before harvest, use resistant varieties, and store only disease-free tubers.
Tomato bacterial wilt (Ralstonia solanacearum) causes sudden, rapid wilting of entire plants without yellowing. Cut stems placed in water ooze milky white bacterial streaming. There is no chemical cure. Use resistant varieties, crop rotation with non-solanaceous crops, grafting onto resistant rootstock, and strict sanitation. The bacterium persists in soil and irrigation water.
Tomato Fusarium wilt (Fusarium oxysporum f. sp. lycopersici) causes yellowing starting on one side of the plant, wilting, and brown vascular discoloration in stems. The fungus persists in soil for decades. Manage with resistant varieties carrying I, I-2, I-3 genes, grafting onto resistant rootstock, crop rotation, and raising soil pH to 6.5-7.0.
Companion Planting
✅ Good Companions
❌ Avoid Nearby
Growing Zones
Frequently Asked Questions
When is the best time to plant Potato?
Cool season crop — 90-120 days to maturity. In tropics, grown at higher elevations (>1,500 m) or during cool dry season.
What soil does Potato need?
Loose, well-drained, slightly acidic loam or sandy loam. pH 5.0-6.5. Heavy clay causes misshapen tubers.
How much water does Potato need?
500-700 mm per crop. Consistent moisture critical during tuber initiation and bulking. Avoid waterlogging (promotes late blight and bacterial wilt).
What are the most common diseases affecting Potato?
The most common diseases are: potato late blight, tomato bacterial wilt, tomato fusarium wilt. Monitor regularly and practice crop rotation.
What plants grow well with Potato?
Good companions include: horseradish, marigold, bean. Avoid planting near tomato, sunflower, cucumber.
Related Crops — Solanaceae
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