The insufficient phosphorus in the soil plays a major role in the reduction of drybean grain quality. The study was conducted to establish the response of three drybean cultivars to varying application rates of phosphorus fertilizer and to varying environmental conditions. The experimental design involved a 5 × 3 × 3 factorial experiment fitted into a randomized complete block design (RCBD), with 4 replications. The measured parameters were ash and crude fibre content, starch and fat content. The research examined three drybean cultivars (PAN 123, PAN 148, PAN 9292) at three sites (Taung, Ventersdorp, Mafikeng) under five phosphorus fertilizer rates. Cultivar PAN 123 had significantly higher ash and crude fibre content of 0.038 and 0.84% respectively than other cultivars. Cultivar PAN 9292 had significantly higher fat content of 0.164% than other cultivars. Drybean planted at Taung had significantly higher ash, fat and protein of 0.079, 0.073 and 1.13% respectively as compared to other location. Phosphorus fertilizer rates had no significant effect on the measured drybean grain quality. This study revealed that, locations with different climatic and soil types affect the quality of drybean grains. Drybean grain quality also differs across the different cultivars.

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