Stability of new rice genotypes for grain yield

Abstract

The yield potential and grain yield stability of three medium duration rice cultures were studied over six cropping seasons at the Regional Agricultural Research Station, 1'attambi. Cul-8770 and Cul-8772 had shown stable high yield potential over the seasons. These two cultures recorded high mean yield and lesser deviation from regression. BR-51-46-1 with its lower mean yield and higher deviation from regression, is not suited for general cultivation, especi.illy during kharif season. The added advantage of Cul-8770 and Cul-8772 is the good straw yield and red bold grains which are highly preferred in Kerala. All these attributes make Cul-8770 and Cul-8772 suited for release as varieties for general cultivation.