Yield comparison of rice genotypes in humid and irrigated lowland

Abstract

Competition tests between F₆ lines from two rice crosses selected the F₄ generation were conducted in humid and irrigated lowland cultivation systems, for two years. From the F₂ generation, segregating generations of each cross were conducted independently in each environment. The objectives were to verify if the same genotypes could be used for both cultivation systems and if only one environment could be used for preliminary selection of rice lines adapted to both cultivation systems, in order to reduce operational costs of lowland rice genetic improvement programs. The results showed that: 1) the same lines can be used indiscriminately in the humid lowland and in the irrigated lowland systems; and 2) in the selection of rices lines for lowland, the segregating populations can be conducted only in the irrigated condition, and then the final evaluations should be done in the irrigated and non irrigated conditions.