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Title

ESTIMATION OF GENETIC PARAMETERS ON GRAIN APPEARANCE QUALITY TRAITS OF RICE THROUGH GENERATION MEAN ANALYSIS

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Abstract

 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– 93.24% IN ALL CROSSES.

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