How to improve potato skin finish
Skin finish is becoming more important as consumers increasingly demand potatoes with clean, attractive skins, particularly when buying pre-packed or loose potatoes. Tubers with surface infections such as black scurf silver scurf, powdery scab or common scab are less attractive and also likely to have a reduced storage life.
Correct balanced nutrition of the will reduce the incidence of skin disorders and improve the skin finish. Calcium strengthens tuber skins providing better resistance to many diseases. Boron, magnesium and manganese can reduce levels of common scab. Zinc can minimise powdery scab. Sulphur may reduce both powdery and common scab infection.
Calcium has a crucial role in improving skin finish
Calcium strengthens tuber skins providing better resistance to many diseases including black scurf silver scurf, powdery scab or common scab. These independent trials from the UK show the reduction in skin blemishes caused by a number of conditions following treatment with calcium nitrate.
Sulphur helps to reduce scab infections
Sulphur helps to reduce the level of common and powdery scab. This effect may be due to a reduction in the soil pH where elemental sulphur is used. Best effects come from applying sulphur to the soil in a readily available form at planting, however a programme of foliar sulphur, can also reduce infection.
Boron improves the effectiveness of calcium
Boron helps stabilise calcium in the cell walls and also affects calcium absorption, so supplies are important to ensure a balanced nutrition and to maximizes the benefits of applied calcium. This trial shows how boron influences the calcium content of tubers and so also the incidence a range of skin disorders.
Zinc helps to reduce disease infections
Zinc is commonly used to suppress powdery scab where the innoculum is at low levels. However, only soil applications are likely to provide sufficient zinc to have an effect on powdery scab and zinc should only be used as part of an integrated control strategy supported by other agronomic measures to limit soil infection alongside a choice of more resistant varieties.
Other crop management practices that improve potato skin finish
- Avoid selecting fields, where adverse factors such as disease, poor drainage or low water holding capabilities are present
- Selecting quality seed with less risk of disease
- Disinfecting seed storage areas to reduce disease carry over
- Irrigating to prevent, or minimise diseases such as common scab
- Harvesting in good conditions to avoid physical damage and disease infestation.
- Avoid liming immediately prior to planting potatoes as this will favour common scab
Recommended Yara fertilisers for potatoes
Related articles
How to reduce potato bruising
Potato tuber bruising is a serious problem in the potato industry. Correct nutrition of the crop prior to harvest can minimise the risk of bruising occurring with potassium, calcium and boron all having effects that reduce bruising.
How to reduce internal spotting in potatoes
Internal spotting of potato is a physiological internal disorder resulting in small brown spots appearing in the tuber. It is usually associated with either poor or interrupted supply of calcium to newly formed and expanding cells.
How to influence potato starch content and quality
Potatoes are one of the most important sources of starch worldwide. Variety choice is very important and potatoes with greater than 13% starch content are required in countries such as Germany. The higher the starch content, the lower the waste.
How to influence potato tuber dry matter content
Potato tubers with high dry matter tend to bruising more easily and disintegrate when boiled but have better fry colour when processed. Nitrogen, potassium and magnesium can all have influences on tuber dry matter content.
How to reduce potato tuber discolouration
Discolouration or internal blackening or browning of potato tubers is responsible for significant post-harvest losses. Potassium, magnesium and boron can all have an influence on discolouration and blackening.
Identify and diagnose potato nutrient deficiencies
Identify and diagnose if your potatoes are suffering from nutrient deficiencies and learn more about the symptoms and causes and how to control or correct the deficiency
Potato agronomy advice
Looking for even more information ...
If you would like more information on potato agronomy or nutrition and would like to speak to one of our area managers or agronomists please find all their contact details here
Contact your local Yara area manager or agronomist
Where can I buy Yara fertiliser ...
If you would like to find your nearest Yara supplier or merchant simply use this searchable map with all their contact details here.
