Efficacy of a Phosphate-Charged Soil Material in Supplying Phosphate for Plant Growth in Soilless Root Media

Figure 1

(a) Phosphate adsorption envelope at five pH levels of the soil material for various concentrations of added phosphate-P (10 mM KCl background solution, 24°C). Legend indicates the milligrams of phosphate-P added per gram of soil material. Lines connecting data points were included to aid in visualizing trends in the data. (b) Phosphate adsorption isotherm of soil at pH 6.0 with a van Bemmelen-Freundlich model fit.

(a)

(b)