Some experiments on supply of ions to the absorbing root surface.

Abstract

In solution culture experiments with tomatoes, lowering the N, P, K and Ca concentration resulted in a higher relative rate of nutrient uptake, as did restricting the transpiration rate. In sand culture experiments on the effect of N concentration, N at 83 or 103 mg/l resulted in well grown plants but N at 48 mg/l in small plants. In another similar experiment in dry or moist air K uptake was less at the lower transpiration rate, but plant growth was little affected. Data are also tabulated on the relative rates of uptake and percentage utilization of the total supply of N, P and K in sand and solution culture. (Abstract retrieved from CAB Abstracts by CABI’s permission)