Effects of Calcium and Potassium on45Ca Mobility, Growth and Nutritional Disorders of Strawberry Plants (Fragariaspp.)

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Abstract
Summary The effects of calcium and potassium levels on 45 Ca mobility, growth and nutritional disorders of strawberry plants have been studied in sand culture. More 45 Ca was fixed at the base (crown and roots) of plants grown under low-calcium conditions than under normal-calcium conditions, consequently less 45 Ca was found in leaves, runners and fruits of the former than in the latter plants. Translocation of both 45 Ca and non-labelled calcium was reduced by high levels of nutrient K. Calcium transport in plants is related to the general cation nutrient status in addition to the specific calcium content. An antagonistic potassium-calcium relationship was observed. Leaf tipburn, runner and petiole browning, and deformed fruits appeared in plants grown with little calcium (especially in combination with high potassium). Examination of tissues affected by calcium stress with a scanning electron microscope showed irregular structure and collapse of cells. For normal fruit development, and for preventing leaf tipburn, strawberry plants require a small but continuous supply of ionic calcium.

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