Comparative Growth Analysis of two Varieties of Rice Following Naphthalene Acetic Acid Application

Abstract

A pot experiment showed that 100 and 200 ppm naphthalene acetic acid (NAA) plant height, number of leaves per plant and number of tillers per plant were found to increase due to 100 ppm NAA only in BRRI dhan-29 (V₁) and varied significantly at 60 DAS. Total dry matter (TDM) was found to increase up to harvest due to both the treatments in V₁, whereas, in BRRI dhan-50 (V₂) also increased at 15 and 30 DAS and the variation was non-significant. There was an increasing tendency in leaf area per plant due to T₁ treatment in both the varieties except at 45 DAS in V₂. Significant variations were observed at 15 and 30 DAS only in V₁. Relative growth rate (RGR) was maximum at early stage of growth and then declined in both the varieties. RGR was significant during 0 to15 and 45 to 60 DAS in case of V₁. Net assimilation rate (NAR) was non-significantly affected and found to increase during 15 to 30 DAS following both the treatments in V₁, but in V₂ due to T₂ treatment only. Out of the two concentrations 100 ppm NAA produced better stimulation.

DOI: http://dx.doi.org/10.3329/jbas.v35i1.7976

Journal of Bangladesh Academy of Sciences, Vol.35, No.1, 113-120, 2011