Summary
In cotton grown in a manganese-rich Buganda soil the effect of phosphorus on the concentration of manganese in the plants depended on the ratio of Ca: P in the nutrient solutions applied. With mole ratios of Ca: P<2 plant manganese concentration increased with all concentrations of added phosphorus. When the Ca: P ratio was 1:2 and 1:1, concentration of manganese was greater in plants grown with the smallest concentration (0.2 mmol/l) of phosphorus in the nutrient solution than in plants without added phosphorus or with more P. With Ca: P>1, manganese concentration in the plants diminished as the concentration of phosphorus in the nutrient increased from zero.
The results indicated that in soils with much manganese a sigmoidal curve may describe response to triple superphosphate because its Ca: P ratio is too small for small dressings of the fertilizer to supply enough calcium to control harmful effects of manganese. re]19760401
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Le Mare, P.H. Experiments on effects of phosphorus on the manganese nutrition of plants. Plant Soil 47, 621–630 (1977). https://doi.org/10.1007/BF00011031
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DOI: https://doi.org/10.1007/BF00011031