Authors:
Angelita Puji Lestari
, Suwarno
, Trikoesoemaningtyas
,Didy Sopandie
, Hajrial Aswidinnoor |
Abstract:
Nitrogen (N) is one of the most important nutrient for plant growth. Low N condition is ussually
occur because its character which easily eliminate from the soil. Thirty-eight rice genotypes were
evaluated under low N and optimum N environments. The experiment was conducted at Muara
Experimental Farm Bogor, Indonesia using augmented design with three replicates under low N
(34.5 kg N ha-1
) and optimum N (138 kg N ha-1
). Seven selection indices for stress tolerance
including mean productivity (MP), geometric mean productivity (GMP) tolerance (TOL), yield
stability index (YSI), stress tolerance index (STI), and stress susceptible index (SSI) were
calculated based on grain yield under low N and optimum N environments. The result of analysis
of variance showed significant variations due to genotypes for grain yield in two N
environments. PCA analysis showed that te first PCA explained 54.0% of the variation with YSI,
SSI, MP, GMP, and STI. Principal component analysis indicated that the first two components
accounted for more than 97% of the total variationsfor drought tolerant indices. Positive and significant correlation of Ys and Yp with MP, GMP, and STI concluded that these indices were
the best predictors of yield under low N and optimum N environments.
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