Grain yield stability of irrigated rice in Alagoas and Pernambuco States

Abstract

From 1986/87 to 1990/91, the performance of eleven irrigated rice genotypes were studied and evaluated in Pernambuco and Alagoas State, in Brasil. The main objective of this work was to study the genotypes environment interaction and the phenotypic stability to grain yield. The experimental design was casualized blocks with three replications and eleven treatments. The grain production responsed to environmental variabilities in a predominantly linear form. On this way, the genotypes EPEAL 101, EPEAL 102 and CNA-4899 showed the greater stability in relation to grain yield, with good conditios to response introduced changes into environment. The genotypes CNA-4893, CNA-3916 and METICA 1 showed significative difference conceming to regression coefficient, ratifying low stability to grain yield. The genotype EPEAL 10 1 became the most promissory one in the study of stability, even showing a low production of grain. On the other hand, the genotype EPEAL 102 was the most productive in grain (8.469 kg/ha) and the CNA-3916 presented the worst performance (7.122 kg/ha).