The first symptom is a puckering of the oldest leaves, which are limp with a dull sheen. The condition then spreads to the next oldest leaves. Sulphur Sulphur deficiency causes a marked inward rolling of the leaves. There is some development of a pink-purple colour on the underside of the leaves, but not as much as in the old rapeseed varieties. However, magnesium deficiency generally causes the leaf margins to roll out rather than in.
Symptoms vary with the degree of deficiency.
High nitrogen availability exacerbates the deficiency. Calcium Calcium deficiency should not occur in a severe form because supplies of this nutrient are rarely deficient. However, because calcium is very immobile in the plant, isolated plants in a crop can show symptoms of deficiency at the beginning of flowering. Similar symptoms of calcium deficiency in linseed are called tipple-topple. Manganese With manganese deficiency, the whole of the plant gradually becomes paler.