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The effect of potassium fertilisers on cadmium absorption by plants under conditions of elevated Cd content in soil

100%

Wisniowska-Kielian B.

Acta Agraria et Silvestria. Series Agraria

2003

tom 40

nr Sek.roln.

In pot experiment on very acid soil the effect of form and dose of potassium fertiliser on the cadmium absorption by oats (Avena sativa L.) and maize (Zea mays L.) under conditions of elevated Cd content in soil was investigated. Potassium was applied in two doses as sulphate or chloride against the background of basic NPK treatment. It was found that cadmium uptake and its content in plant tissues was confined or intensified by potassium salts, what dependent on plant species and also K form and dose, probably due to influence on its soluble compounds content in the soil. K2S04intensified Cd accumulation in roots of both species and confined its translocation to aerial parts of maize (Fig 1). effect was greater after higher K dose application. Smaller or opposite effect was observed in case of oats, which showed similar Cd content in shoots when lower K dose in both form was applied, and lower Cd level after higher K dose application in sulphate form (Fig. 2). of Cd absorption from contaminated soil by sulphate may improve fodder quality of plant products.