Shade sensitivity index of six brown-seeded soybean (Glycine max (L.) Merrill) genotypes based on seed weight

This study aims to find out the shade sensitivity indexes of six brown-seeded soybean genotypes based on the yield (seed weight). This study was carried out using the experimental methods with the experimental design of a split plot design. The main plot was the shade stress conditions (S) consisting of S0 = without shade stress and S1 = 65% shade stress (using black shading net house). The sub plot was the brown-seeded soybean genotypes (G) consisting of six lines: G1 = KH7b; G2 = KH7c; G3 = KH7d; G4 = KH9; G5 = KH14; and G6 = KH50b. The results of the study showed that: 1). The KH50b genotype was the most shade suscaptable genotype follewed by KH7d, KH14, and KH9 as indicated by the highest shade sensitivity index (SSI) and tolerance index (TOL). 2). The KH7b genotype was the most shade tolerance genotype followed by KH7c as indicated by the lowest shade sensitivity index (SSI) and tolerance index (TOL). KH7b and KH7c genotypes were the most stable genotypes as indicated by the highst yield stability index (YSI) and yield index (YI). The highest yield (seed weight) under normal (no stress) condition was KH50b genotype and under the shade stress was KH7b genotype.