Comparative behavior of three wheat cultivars and their mixture in India, Nepal and Pakistan uri icon

abstract

  • Little is known about the behavior of wheat cultivar mixtures over a broad range of environments. Therefore, the main objectives of this study were: (1) to compare the stability of yield of a three-component wheat mixture with that of its components over a range of environments, and (2) to compare natural infection, by different diseases, of the mixture versus its components. The results provide strong evidence that the mixture behaved in a usefully predictable manner, at least as well as the means of the components, over a diverse range of environments in South Asia. The mixture was less variable over all environments compared with its components but was not necessarily more stable. The mixture restricted yellow and leaf rusts and foliar blight relative to the means of the components. No single method of stability analysis gave an unequivocal idea of stability. However, stochastic dominance analysis and the Westcott geometric method seemed most useful for indicating the genotypes that were least risky. Considering all environments, UP262 was the least stable genotype. Ska was less variable but had a lower mean yield. The mixture was relatively high yielding with the least variability. NL459 had the highest yield but was variable. Nevertheless, it emerged as stable in some analyses. From the point of view of safety over a large area of cultivation, the mixture would be preferable to NL459.

publication date

  • 1994
  • 1994