The Effect of Calcium and Its Relation to Several Cations in Soybean Root Growth1
- Zane F. Lund2
Short-term, split-root experiments were conducted in a growth chamber with ‘Lee’ soybeans (Glycine max). The upper portion of the root medium was a limed, fertilized sandy loam surface soil; the lower portion was a nutrient solution. Calcium concentration of 0.25 ppm was sufficient to obtain maximum growth rates in a nutrient solution at pH 5.6. More than 2.5 ppm of Ca was required at a solution pH of 4.5, and 5 ppm of Ca was insufficient when the pH was 4.0. High concentrations of Mg [ratios of Ca/(Ca + Mg) of 0.1 or less] also reduced growth. Replacing half of the Mg with K at low ratios of Ca/total cations produced more rapid elongation than the Ca + Mg systems, but had no effect at the higher ratios. Aluminum in the nutrient solution reduced root growth when the ratio of activities of Al to Ca was greater than 0.02.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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