Determination of the Relationship between Nutrient Uptake Rate and Solution Concentration at the Root Surface under Field Conditions:32P-Orthophosphate Uptake by Apple Roots

Publisher Website
Google Scholar
Abstract
The relationships between the rates of uptake of 32P-labelled orthophosphate per unit length, surface area and volume of root and the concentration of 32P-orthophosphate in solution at the root surface were determined in a solution depletion experiment conducted in a root laboratory, using a part of the current season's roots of a 3.5-year-old composite apple tree growing under field conditions. The results are compared with those of a previous experiment on young M.9 rootstocks grown in controlled environment. The rate of P uptake per unit root of the field-grown tree increased approximately linearly with P concentration in the external solution over the range 0.8–10.0 mmol m−3, confirming the results of the growth cabinet experiment However, at any given external concentration, uptake rate per unit root of the field-grown tree was lower than that observed in the growth cabinet experiment. Possible reasons for this difference are discussed.

This publication has 0 references indexed in Scilit: