Nutrients

N Nitrogen
P Phosphorus
K Potassium
Mg Magnesium
Ca Calcium
S Sulphur
B Boron
Cu Copper
Fe Iron
Mn Manganese
Mo Molybdenum
Zn Zinc

Potatoes - Chlorosis

Symptoms
Symptoms begin with yellowing in intercostal areas at the base of leaflets or leaf margin. The chlorosis expands to the whole leaf as the deficiency continues. The margin often remains green. Eventually necrotic patches appear in the yellow areas which terminate as intercostal leaf scorch. Symptoms are most severe in the oldest leaves, which have green veins and large areas of marginal and intercostal necrosis.

Reasons
Severe magnesium deficiency. Manganese deficiency is similar but here intercostal yellowing starts on younger leaves and the necrosis is usually in spots along the line of the veins.

Potatoes - Deformation

Symptoms
Symptoms begin with yellowing in intercostal areas at the base of leaflets or leaf margin. The chlorosis expand to the whole leaf as the deficiency continues. The margin often remains green. Eventually necrotic patches appear in the yellow areas which terminate as intercostal leaf scorch. The leaf margins roll up and begin to crumble. Symptoms are most severe in the oldest leaves, which have green veins and large areas of marginal and intercostal necrosis.

Reasons
Severe magnesium deficiency. Manganese deficiency is similar but here intercostal yellowing usually starts on younger leaves.

Potatoes - Chlorosis

Symptoms
Symptoms begin with yellowing in intercostal areas at the base of leaflets or leaf margin. The chlorosis expand to the whole leaf as the deficiency continues. The margin often remains green. Eventually necrotic patches appear in the yellow areas which terminate as intercostal leaf scorch. Symptoms are most severe in the oldest leaves, which have green veins and large areas of marginal and intercostal necrosis.

Reasons
Magnesium deficiency. Manganese deficiency is similar, but here intercostal yellowing starts on younger leaves.

Potatoes - Chlorosis

Symptoms
Symptoms begin with yellowing in intercostal areas at the base of leaflets or leaf margin of older leaves. The chlorosis expand to the whole leaf as the deficiency continues. The margin often remains green. Eventually necrotic patches appear in the yellow areas which terminate as intercostal leaf scorch. Symptoms are most severe in the oldest leaves, which have green veins and large areas of marginal and intercostal necrosis.

Reasons
Magnesium deficiency. Manganese deficiency is similar but here intercostal yellowing starts on younger leaves and the necrosis is usually in spots along the line of the veins.

Potatoes - Chlorosis

Symptoms
Symptoms begin with yellowing in intercostal areas at the base of leaflets or leaf margin. The chlorosis expands to the whole leaf as the deficiency continues. The margin often remains green. Eventually necrotic patches appear in the yellow areas which terminate as intercostal leaf scorch. Symptoms are most severe in the oldest leaves, which have green veins and large areas of marginal and intercostal necrosis.

Reasons
Severe magnesium deficiency. Manganese deficiency is similar but here intercostal yellowing starts on younger leaves and the necrosis is usually in spots along the line of the veins.

Potatoes - Chlorosis

Symptoms
Symptoms begin with yellowing in intercostal areas at the base of leaflets or leaf margin. The chlorosis expands to the whole leaf as the deficiency continues. The margin often remains green. Eventually necrotic patches appear in the yellow areas which terminate as intercostal leaf scorch. Symptoms are most severe in the oldest leaves, which have green veins and large areas of marginal and intercostal necrosis.

Reasons
Severe magnesium deficiency. Manganese deficiency is similar but here intercostal yellowing starts on younger leaves and the necrosis is usually in spots along the line of the veins.

Potatoes - Chlorosis

Symptoms
Symptoms start with yellow mottling in intercostal areas of the leaf, often at the base of leaflets or leaf margin. The chlorosis expands to the whole leaf as the deficiency continues. Symptoms are most severe in the oldest leaves.

Reasons
Beginning magnesium deficiency. Manganese deficiency looks similar but here intercostal yellowing usually starts on younger leaves.

Magnesium deficiency made worse by

  • Sandy soils
  • Acidic soils
  • Potassium rich soils
  • Soils receiving high potash applications
  • Cold wet periods

Magnesium is important for

  • Boosts bulking
  • Increased yield of tubers
  • Improved disease resistance and skin quality
  • Increased tuber dry matter content and starch levels

Yara recommended fertilizers for Magnesium

YaraVita® HYDROMAG™

YaraVita® HYDROMAG™

Potatoes: 4 l/ha 1.6 l/acre) one week after 100% emergence. Also apply during tuber bulking following petiole analysis. For moderate to severe deficiency, repeat applications at 10 to 14 day intervals. Water rate: 75 to 200 l/ha (30 to 80 l/acre). Pommes de Terre: 4 l/ha une semaine après la levée. Appliquer aussi pendant le grossissement suite à l'analyse pétiolaire. En cas de carence moyenne ou sévère répéter l'application à 10-14 jours d'intervalle. Volume d'eau: 30 à 200 l/ha.

Read more about YaraVita® HYDROMAG™

Other recommended products

YaraVita® HYDROPHOS™
Potatoes: To increase tuber number, 10 l/ha at tuber initiation (when 50% of tip swellings are twice the diameter of the rest of the stolon). To increase tuber size, a minimum of 2 applications of 5 l/ha during tuber bulking (when the first formed tubers are greater than 10 mm in diameter). Allow 10 to 14 days between applications. Also, apply during tuber bulking following petiole analysis. Water rate: 200 l/ha. Pommes de Terre: Pour augmenter le nombre de tubercules: 10 l/ha à l'initiation des tubercules (quand 50% des stolons se sont gonflés à 2 fois leur diamètre normal juste derrière la pointe). Pour augmenter le calibre des tubercules: Au moins 2 applications de 5 l/ha pendant le grossissement (premiers tubercules 10 mm de diamètre). Laisser 10-14 jours entre traitements successifs. Appliquer aussi pendant le grossissement suite à l'analyse pétiolaire. Volume d'eau: 200 l/ha.