Genotypic tolerance of selected dry bean (Phaseolus vulgaris L.) cultivar s to soluble Al and to acid, low P soil conditions

Abstract

Twelve dry bean cultivare were grown for seven days on filter paper soaked with nutrient solution containing a range of up to 10 mmol Al dm⁻³. Differential response to Al toxicity, measured as taproot elongation, occurred at Al concentrations of ≧ 2 mmol dm⁻³. Fifteen cultivare (including four cultivare classified in terms of Al tolerance by the nutrient-solution method) were grown in pots containing an acid (64% acid saturation of CEC), P-deficient clay loam subsoil (Plinthic Paleudult), differentially treated with Ca(OH)₂ and CaHPO₄. 2H₂O. After 35 days the plants were classified in terms of tolerance to acid, low P soil conditions, on the basis of relative topgrowth yields. Three of four cultivare screened by both methods were classified identically: lapar-Rai-54 and W126 as tolerant, and BAT331 as sensitive.