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

Figure 2

Potassium concentration in bulk solutions of root media amended with no soil material (control) and six soil material treatment combinations containing 5 or 10% soil material (v : v) charged with 0, 2.2, or 6.5 mg·g⁻¹ phosphate-P during the (a) first, (b) second, and (c) third of three successive tomato seedling crops. Bars indicate ± SE (). Lines connecting data points were included to aid in visualizing trends in the data.

(a)

(b)

(c)