STUDY ON MORPHOLOGICAL CHARACTERISTICS AND YIELD PERFORMANCE OF MUSTARD AS INFLUENCED BY INDOLE ACETIC ACID (IAA)

Abstract

The experiment was conducted at the research field and laboratory of Department of Crop Physiology and Ecology, Hajee Mohammad Danesh Science and Technology University, Dinajpur during the period of November 2013 to April 2014 to investigate the morphological variations, yield and yield contributing characters of mustard varieties under different levels of indole acetic acid (IAA) for determining the optimum dose of IAA for mustard cultivation. The experiment was designed as randomized complete block design with three replications, the treatment factors were consist of three IAA levels (0, 100 and 200 ppm IAA) and four mustard varieties (Tori 7, BARI Sharisha 7, BARI Sharisha 9 and Sharisha 11). The interaction effect of IAA and varieties on days to flowering and days to maturity of mustard were found significant. All the varieties attained higher plant height under IAA treated plots than control plots. The BARI Sharisha 11 produced the highest number of siliqua, longest siliqua, maximum number of seeds per siliqua and 1000 seed weight in 100 ppm IAA treated plot which was followed by BARI Sharisha 9. All the varieties produced lower yield at control condition compared to the auxin treated plots. BARI Sharisha 9 gave the highest seed yield (2500 Kg ha”) and stover yield (11250 Kg ha) with 100 ppm IAA and Tori 7 produced the lowest seed and stover yield under 0, 100 and 200 ppm IAA treated plots. BARI Sharisha 11 and BARI Sharisha 7 were produced intermediate yield in IAA applied plots. The harvest index (HI) of BARI Sharisha 7, BARI Sharisha 9 and BARI Sharisha 11 were statistically similar ranging from 17.70 to 19.47% for all concentrations of IAA. From the overall results, it may conclude that application of IAA increased mustard yield and 100 ppm IAA suitable for cultivation of BARI Sharisha 9 followed by BARI Sharisha 7 by same dose of IAA.