STABILITY ANALYSIS OF PROMISING GENOTYPES FOR PLANTING METHODS IN RICE (Oryza sativa L.)
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Date
2018
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Acharya N.G. Ranga Agricultural University
Abstract
The present investigation was carried out with 26 rice genotypes at Regional Agricultural Research Station, Maruteru during kharif 2017 to identify stable genotypes across planting methods, in addition to assessment of character association and path coefficients for yield, yield components and quality traits. The experimental material was sown in randomized block design with three replications in the three planting methods, namely transplanting, SRI and wet direct seeding method. The data recorded for yield, yield components and quality traits in each planting method was subjected to standard statistical procedures for drawing of valid conclusions and interpretations.
Analysis of variance (ANOVA) for planting methods, namely, transplanting, SRI and wet direct seeding methods revealed highly significant differences among the genotypes for all characters studied. Pooled analysis of variance revealed significant mean squares due to genotypes, environment and genotype x environment interaction. The environment + (genotype x environment) interaction was observed to be significant for all the traits studied. Further, environment (linear) was found significant for majority of the traits. The linear component of genotype x environment was also observed to be significant and greater than non-linear component of genotype x environment interaction (pooled deviation) for most of the traits. Further, pooled deviation (non-linear) was found to be significant for most of the traits studied. The results on environmental indices revealed transplanting method to be most congenial for 1000 seed weight, HRR and L/B ratio, while SRI method was noticed to be conducive for plant height, ear bearing tillers per plant, panicle length, filled grains per panicle, grain yield per plant, hulling and milling per cent, while, wet direct seeding was found to be congenial for early flowering and maturity.
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n ana ys s o the resu ts on the stab ty para eters na e y ean ), regression coefficient (bi) and deviation from regression coefficient ( 2di) revealed the genotypes, MTU 1010, MTU 1075, MTU 1121, MTU 1210, MTU 1224, NLR 3042 and NLR 34449 to be high yielding, stable and widely adaptable, while MTU 1061, MTU 1064 and MTU 1226 were found to be suitable for cultivation under transplanting method only. The genotypes MTU 1224, MTU 1075, MTU 1210 and MTU 1121 were identified as potential genotypes suitable for cultivation across the planting methods prevalent in the state of Andhra Pradesh. The genotypes, MTU 1224 and MTU 1121 had also recorded high mean performance, in addition to stability and wide adaptability for all the quality traits studied in the present investigation across the planting methods studied, namely, transplanting, SRI and wet direct seeding.
A perusal of the results on character associations revealed correlation co-efficients of similar direction and magnitude in all the planting methods studied for most of the characters. Positive and significant association of ear bearing tillers per plant, grains per panicle and 1000 seed weight was observed under all the methods studied. The path analysis also revealed path co-efficients of similar direction and magnitude in all the planting methods for most of the characters studied. High residual effect was observed for all the methods, indicating that other attributes, besides the characters studied are contributing for grain yield per plant. 1000-seed weight had exhibited high positive direct effect in addition to strong association with grain yield per plant under all the planting methods and hence is identified as effective selection criteria for grain yield improvement in all the planting methods, namely, transplanting, SRI and wet direct seeding.
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D5652
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