Summary
The sorption of phosphorus from nutrient solution and the pH change in the nutrient solution were monitored over a 24 hour period forTrifolium repens L. cv. ‘Grasslands Huia’ plants. Two different concentration levels of micro-nutrients (B, Cu, Fe, Mn and Zn) and Al formed the factors of a fractional replicate of a 26 factorial design.
Measurements were made at four time intervals (30 minutes after the plants were placed on the pots, 3 hours, 6 hours and 24 hours later). In addition to phosphorus, fourteen other nutrients (including nitrate and ammonium) were monitored throughout the experiment.
The sorption of phosphorus was significantly influenced by both aluminium and iron. The effect of aluminium and iron on phosphorus sorption is attributed to physico-chemical sorption processes involving the root surface. However the effect on the removal of phosphorus by boron, copper, manganese and zinc was observed only as first order interaction effects —B−Zn, Cu−Zn, Mn−Zn. Thus these three elements (B, Cu and Mn) only affect phosphorus removal in conjunction with zinc. Aluminium and iron together had a separate but very significant effect on the removal of phosphorus at most periods throughout the experiment. In contrast, pH was affected only by aluminium, iron (the pH drop was enhanced) and manganese (the pH drop was decreased) as main effects independent of the other treatment elements.
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Pritchard, M.W., Lee, J., Dunlop, J. et al. Effects of aluminium and micro-nutrients on the sorption of phosphorus byTrifolium repens L. cv. ‘Grasslands Huia’ from nutrient solutions during plant induced pH changes. Plant Soil 81, 389–402 (1984). https://doi.org/10.1007/BF02323053
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DOI: https://doi.org/10.1007/BF02323053