Reports on heterosis for the physicochemical grain quality characters in rice are limited. We studied the heterotic manifestations in nine grain quality characters in 30 hybrids involving six parentts—IR50, ADT37, ADT41, Duansan, TKM6, and ADT39. The hybrids were created by full diallel mating of these six parents.
The experiment was laid out in a randomized block design with three replications during the 1993-94 dry season. Each genotype (parents and hybrids) was planted in three 3-m rows at 30- × 20-cm spacing. Observations were recorded for five randomly selected plants per replication.