Summary
In pot experiments with oats on sandy soil poor in sodium and potassium a study was made of the effect of the addition of Na2SO4 and K2SO4 on the mineral composition of the straw.
The addition of sodium at 200 ppm Na significantly increased the phosphorus content of the straw and there was a slight further increase with 200 ppm Na plus 200 ppm K, but the phosphorus content never exceeded 0.13 per cent.
Sodium and potassium caused a highly significant decrease in the silica content of the straw. Decreased lodging in soils inundated with sea water can therefore not be ascribed to an increase of silica content.
The calcium and the cellulose contents of the straw were both significantly reduced by sodium and potassium.
References
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Wooley, J. T., Sodium and silicon as nutrients for the tomato plant. Plant Physiol.32, 317 (1907).
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Morani, V., Fortini, S. Sodium in the mineral nutrition ofAvena Sativa . Plant Soil 18, 140–142 (1963). https://doi.org/10.1007/BF01391688
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DOI: https://doi.org/10.1007/BF01391688