STUDIES OF MORPHOPHYSIOLOGICAL AND YIELD OF BRRI dhan28 UNDER NAPHTHALENE ACETIC ACID By Jahangir

Abstract

A field experiment was conducted to study the effect of NAA (Naphthalene Acetic Acid) on morpho-physiological, yield and yield combinations of HYV rice varieties cv. BRRI dhan28. The study was performed during the period from February to June, 2016 using 6 levels of Naphthalene Acetic Acid (NAA) such as 0, 25, 50, 75, 100, 125, ppm designated as T1, T2, T3, T4, T5 and T6 following 4 replications designated as R1, R2, R3 and R4 respectively. The results showed that the morphological, physiological, chemical properties of leaves, yield and yield attributes were significantly influenced due to the levels of NAA. The plant height, leaf number per plant, root number, root depth, flag leaf chlorophyll-a and chlorophyll-b, total chlorophyll, total carotenoid content, protein content, Ca and Mg content, panicle length, effective tiller, ineffective tiller, tiller number per plant, grain number per panicle, grain yield, straw yield and biological yield were increased markedly due to the application of NAA. The highest plant height, root depth, number of tillers hill-1 , total chlorophyll content were obtained from 125 ppm NAA spraying at seedling, vegetative and harvesting stages. The highest yield of BRRI dhan28 cultivar was 4.49 (t ha-1 ) due to the application of 125 ppm NAA while other applied levels and controlled condition had less effect on the growth and yield attributes. Plant growth regulator (NAA), promotes the growth and yield of BRRI dhan28 which might be an alternative eco-friendly tool for rice production. Out of six levels, 100 and 125 ppm performed better considering growth and yield parameters. Therefore, it infers that the application with 100 ppm NAA had the better stimulation and growth on yield of BRRI dhan28 in the study area.