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

NARGIS JAHAN
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh.

A. M. M GOLAM ADAM
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh.

Abstract/ Executive Summary:

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.

Keywords: Rice, Naphthalene acetic acid, Foliar application, Growth analysis

Location:

Start Date: 00-00-2009

End Date: 00-00-2010

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To study the effect of NAA on some growth parameters of two varieties of rice.

Methodology:

During 2009-2010 Boro season a pot experiment was set in the garden of the Department of Botany, University of Dhaka with two varieties of rice BRRI dhan-29 (V₁) and BRRI dhan-50 (V₂). BRRI dhan-29 is a high yielding variety and BRRI dhan-50 is an aromatic variety. From the initial analysis of the experimental soil, optimum level of nitrogen and potassium and high level of phosphorus were recorded (Fertilizer Recommendation Guide 2005). Each pot was filled with 9.0 kg air dried soil mixed with 0.5 kg cow-dung. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Seeds collected from BRRI, Joydebpur, Gazipur were sterilized with 0.5% Ca(OCl)₂ solution for five min and repeatedly washed in distilled water to remove any trace of Ca(OCl)₂. Seeds were sown on November 7, 2009 and seedlings were transplanted to experimental pots at the age of 36 DAS. Before transplanting the seedlings, 2 g of gypsum was also added in each pot. Initially five seedlings were placed in each pot and thinning was done to keep a healthy seedling per pot. Weeding and irrigation were done as per necessity. Urea as a source of nitrogen was applied twice at the rate of 222 kg/ha at 20 and 50 DAT. The trial comprised of three foliar treatments: T₀ = distilled water (control), T₁= 100 ppm NAA and T₂= 200 ppm NAA. Treatments were applied as foliar spray at 57 DAT. Data on plant height, number of leaves per plant, number of tillers per plant, total dry matter, leaf area per plant, relative growth rate (RGR) and net assimilation rate (NAR) were recorded from the age of 15 days after spray (DAS) at an interval of 15 days. Leaf area (LA) was measured by lengthwidth method according to experimental studies at IRRI (1972). RGR and NAR were calculated following the classical growth analysis method (Radford 1967). Data were statistically analyzed and compared by LSD test (Steel and Torrie 1960) at 5% level of significance.

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

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The overall results indicated that NAA has both stimulatory and inhibitory effect on different growth parameters which are in accord with the fact that plant growth regulators at identical concentration can have quite different effects on different plants and even on different organs of the same plant (Ridge 1991). Out of the two concentrations of NAA, 100 ppm NAA produced better stimulations.

Knowledge Management: Journal