Response of Vegetable Crops to Phosphorus Concentrations in Soil Solution1

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Abstract The response of 9 vegetable crops to P concn in the soil solution was determined in field studies on soils with a relatively high capacity for immobilizing P. Adjusted P concentration in the soil solution ranged from 0.003 ppm, doubling at each level, to 1.6 ppm. Most crops produced maximum yields at 0.2 to 0.3 ppm P in soil solution, although transplanted head cabbage (Brassica oleracea L. Capitata Group) and sweet potato (Ipomoea batatas (L.) Lam) produced maximum yields at 0.04 and 0.1 ppm, respectively. At suboptimal P concentration in soil solution, crop response varied greatly. Sweet potato produced about 70% of maximum yield, while lettuce (Lactuca sativa L.) produced about 1% of maximum yield. P levels in plant tissue at 95% of maximum yields ranged from 0.3% in lettuce to 0.7% in Chinese cabbage (Brassica campestris L. Pekinensis Group).