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Growing Potato crop nutrition advice
Growing Potato crop nutrition advice
Everything you need to know about fertilizing potatoes, best practices, suitable products, field trials and more
Crop nutrition advice for growing potato (Solanum tuberosum)
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Potatoes perform best in soil with a pH between 5.5 and 6.7.
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Potatoes thrive well and give the best yield in sandy loam to slit loam organically rich and well-drained soil.
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In soils with a high pH (above 7.5), deficiencies of phosphorus and micronutrients may appear.
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In high pH conditions potatoes are susceptible to scab bacterial infection caused by Streptomyces scabies.
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The optimum conditions for root development and tuber initiation are well drained, aerated soils, with temperatures between 59 and 68 oF.
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Shorter days will help tuber initiation whereas longer days will delay it.
Nutrient requirements
Estimated nutrient uptake (kg/t) by:
| N | P2O5 | K2O | Mg | S | C | |
|---|---|---|---|---|---|---|
| Kg/ha | Kg/ha | Kg/ha | Kg/ha | Kg/ha | Kg/ha | |
| Tubers | 139 | 66 | 288 | 15 | 22 | 7 |
| Above ground biomass | 214 | 25 | 330 | 25 | 12 | 13 |
Source: IPNI
Role of nutrients
Key parameter N P2O5 K2O Mg C S
Yield ++ + ++ + +/- +/-
Tuber size ++ ++ +
Tuber weight ++ + ++
Skin set - + +
Bruising and handling - + ++ ++
Tuber color (internal blackening) +/- +
Dry matter content - +/- - +/-
Starch content - + +/-
+ = improving
– = decreasing
+/- = different results, depending on the rate of nutrient applied
Source: IPI bulletin – Fertilizing for high yield | POTATO
Nutrient deficiencies
| Nutrient | Description | |
|---|---|---|
| Nitrogen | Leaves are pale green (general chlorosis) Old leaves remain yellow, while younger leaves turn darker Plants will produce less stems and tubers |
|
| Phosphorus | Plant growth is stunted Darker color than normal Lower leaf surface gray green Leaflets roll upwards if deficiency is severe. It occurs on calcareous and heavy soils, where P can be fixed |
|
| Potassium | Potassium deficiency symptoms normally Scorched appearance with black pigmentation and necrotic edges (dead tissues) Symptoms appear on the young, full-sized leaves Common in light soils due to easier leaching. |
|
| Calcium | Moderate calcium deficiency may not appear but in severe situations leaf’s margin can be affected Brown blotches may appear around the stolon end of the tubers Tubers may show severe skin cracking Deficiencies are severe in soils with pH below 5 |
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| Magnesium | Chlorosis of leaf margins of older leaves. Yellowing Symptoms appear first on the older leaves, due to its mobility General chlorosis with veins remaining green Scorched appearance caused by interveinal necrosis Can occur on sandy soils and when high K level were applied |
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| Sulfur | Symptoms are similar to nitrogen deficiency, but deficiency symptoms occur first in younger leaves (as yellowing similar N deficiency) General chlorosis The yellowing is uniform and general It may occur on loamy sand soils |
Potato plants with healthy leaves
Potatoes harvested in optimum condition
Q&A
Here are some frequently asked questions we received from farmers regarding growing potatoes
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This decision begins with a soil test, however, potatoes are highly responsive to P and may require additional fertilizer beyond what the soil test recommends. Additional strategies to improve the efficiency of P fertilizer use include placement close to the seed piece, use of humic or fulvic acids, and acidifying P fertilizers like Agrolution pHLow to ensure maximum availability to the plant.
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Sulfur is essential for all crops. In potatoes, adequate sulfur nutrition can reduce sugar development in storage and increase tuber yields.
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Calcium is important in the development of roots and shoots and will also help with reducing storage losses.
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Yes, improving the health of the soil will improve water management and nutrient availability.
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