EVALUATION OF RICE VARIETIES FOR YIELD AND ANCILLARY TRAITS UNDER ORGANIC CULTIVATION
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Date
2019-07
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AAU, Jorhat
Abstract
An experiment was laid under both organic and inorganic conditions with ten rice varieties grown under organic situation for more than ten years. The rice varieties collected from farmer’s field were grown with an objective to observe traits suitable for varietal development under organic situation. The analysis of variance for nine quantitative characters, nine grain characters and eight biochemical characters indicated existence of variation of the characters among the varieties. The pooled analysis indicated high G x E interaction for most of the characters under investigation indicating necessity for selection of the characters separately for both organic and inorganic situations. In pooled analysis of variance, it was also found high G x E interaction for Fe (Iron) and Zn (Zinc), which indicated that for these two important micro-nutrients selection, will be effective under organic situation. The correlation coefficient for quantitative character like grain yield is positively correlated to ear bearing tiller (EBT) and Harvest Index (HI) for both organic and inorganic condition, whereas grain yield is negatively correlated to plant height for both the growing situation. It is also observed that Flag Leaf Area (FLA) is positively correlated to grain yield for inorganic condition only. Grain character like Head Rice Recovery (HRR), an important character with respect to marketability of organic produce in the international market and consumer preference, is found to be negatively correlated to Hulling Percentage (HP). In Path Analysis for both organic and inorganic cultivation, it is observed that the highest direct effect is contributed by EBT. High GCV (Genotypic coefficient of variation) and heritability were observed in most of the characters which indicated preponderance of genes in expression of characters. In most of the characters like plant height, EBT etc., GA (Genetic Advance) and Heritability were found to be high indicating additive gene action and effective action of simple selection procedure in improvement of characters under organic situation. Hence, it is concluded from the experiment that variability exist for characters in the indigenous varieties for organic situation and breeding program has to be taken separately for organic situation through selection.