Summary
In four field experiments high rates of granular triple superphosphate and repeated sprays of manganese sulphate were applied to oats and sugar beet on land known to produce manganese-deficiency symptoms in these crops. It was found that spraying did not increase the manganese content of the foliage while application of superphosphate did.
Possible explanations for this are discussed and it is suggested that the most likely one is chemical mobilization of soil manganese brought about by the reactions that the monocalcium phosphate in superphosphate undergoes in soil.
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Larsen, S. The effect of phosphate application on manganese content of plants grown on neutral and alkaline soils. Plant Soil 21, 37–42 (1964). https://doi.org/10.1007/BF01373870
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DOI: https://doi.org/10.1007/BF01373870