Abstract
Abstract The effects of three ratios of Ca/(Ca + K) and three rates of NO3‐N on ion ratios in plants grown in soil and nutrient culture are reported. Plant uptake parameters, based on nutrient culture studies, together with soil chemical parameters, were used in a multiple‐ion uptake model to calculate the cumulative, uptake of individual ions. These calculated uptakes were then used to derive relevant ratios for comparison with those measured in plants grown in soil in a growth chamber. The results illustrate that the ionic ratios based on the model are well correlated with the measured plant ratios. Regressions of plant ratios on model ratios were calculated; the intercepts were not zero and the slopes were not one. The discrepancies between measured and model ratios were probably a consequence of deficiencies in the model and unmeasured plant uptake parameters. The results illustrate that the model is a useful way to summarize data and to generate hypotheses.
Published Version
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