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Effects of Naphthalene Acetic Acid on Yield Attributes and Yield of Two Varieties of Rice (oryza Sativa L.)

AMM Golam Adam
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

Nargis Jahan
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

Effects of 100 and 200 ppm of naphthalene acetic acid (NAA) on yield attributes and yield of two varieties of rice during 2009 - 2010 Boro season were evaluated. The highest plant height was observed due to 200 ppm in both BRRI dhan-29 (V₁) and BRRI dhan-50 (V₂). Number of tillers per plant were found to increase due to 100 ppm NAA only in BRRI dhan-29 and varied non-significantly. Yield attributes, viz. number of branches per panicle, number of grains per panicle and filled grains per panicle increased in BRRI dhan-29, following both 100 and 200 ppm NAA, whereas, most of the yield parameters decreased in BRRI dhan-50. Findings of the study indicated that, the increase in yield following both the treatments in the variety V₁ could be due to the combined effect of increases in almost all the reproductive parameters and also decrease in per cent of un-filled grains per panicle. Moreover, increase in yield per plant achieved with T₁ treatment was due to increased assimilative area and as a result more photosynthesis throughout the growth period. Thus, 100 ppm NAA proved to be more stimulative. Due to 100 and 200 ppm NAA, grain yield per plant increased by 27.67 and 6.85%, respectively in BRRI dhan-29 though not statistically significant. However, in BRRI dhan-50 grain yield per plant decreased by 26.54% due to 100 ppm and 27.67% due to 200 ppm. Out of the two concentrations 100 ppm NAA produced better stimulation.

Keywords: Rice, Naphthalene acetic acid, Foliar application, Yield

Location: Department of Botany, University of Dhaka

Start Date: 00-11-2009

End Date: 00-04-2010

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To study the effect of Naphthalene Acetic Acid (NAA) on yield attributes and yield of two varieties of rice.

Methodology:

The pot experiment was conducted in the garden of the Department of Botany, University of Dhaka during the period from November, 2009 to April, 2010. Each pot (about 30 cm in diameter at the top) was filled with 9.0 kg air dried soil. Cow-dung was mixed uniformly during pot preparation and 2 g of gypsum was also added in each pot (equals to 444 kg/ha). The experiment was laid out in a randomized complete block design (RCBD) with three replications. Plant materials were collected from Bangladesh Rice Research Institute (BRRI), Joydebpur, Gazipur. BRRI dhan-29 is a high yielding variety released in 1994 and BRRI dhan-50 is an aromatic variety released in 2008. Seeds were sterilized by 0.5% calcium hypochlorite solution and were sown on November 7, 2009. Seedlings were transplanted to pots at 5- leaf stage at 36 days after sowing. Five hills were placed in each pot, each hill containing one seedling. Thinning was done in such way that a healthy seedling of uniform size and vigour was allowed to grow. Irrigation was done as per necessity. Weeding was done twice on 25 and 45 day after transplanting (DAT). Split applications of urea were applied twice at the rate of 1 g per pot (equals to 222 kg/ha) at 20 DAT and at 50 DAT. There were three treatments as follows; T₀ = distilled water (Control), T₁ = 100 ppm NAA and T₂ = 200 ppm NAA. Treatments were applied as foliar spray at 57 DAT. Plant height, number of tillers per plant, number of panicles per plant, length of panicle, number of branches per panicle, total grains per panicle, filled grains per panicle, per cent un-filled grains per panicle and 1000-grain weight were recorded after harvest. Yield per plant was calculated. Harvest index was also calculated. Data were analyzed statistically (Steel and Torrie 1960) and treatment means were compared by LSD test at 5% level of significance.

Source of Information: Bangladesh J. Bot. 40(1): 97-100, 2011 (June)

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Funding Source:

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Total Budget (Tk.) :

Achievement/Findings:

The results indicated that, NAA has both stimulatory and inhibitory effect on different yield parameters, and it depends on several factors including the varietal difference and concentration of the chemical. Analysis of data indicated that, out of the two concentrations of NAA, 100 ppm NAA produced better simulations in the variety V₁ but the magnitude of effect was different.

Knowledge Management: Journal