Evaluation location: , India
Accessions were planted under 3 soil fertility regimes and assayed for tuber yeild, dry matter content, and true protein content. A response index was used to characterize the behavior of each genotype to fertilizer application. The soil regimes are as follows: F0 = sub-optimal (0kg N, 0kg P, 0kg K per ha); F1 = standard (120kg N, 35kg P, 67kg K per ha); F2 = super-optimal (160kg N, 44kg P, 84kg K per ha). Yield and protein content increased with increased applications of fertilizer. Dry matter decreased with increased fertilizer dose, but when the fertilizer dose was further increased, dry matter increased. These results indicate that performance and responsiveness to fertilizers are linked and hence will not be easily amenable to independent alteration.