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Growth Analysis of BRRI Dhan44 (oryza Sativa L.) Following 2,3,5 Tri-iodo Benzoic Acid Application

A. M. M. Golam Adam
Department of Botany, Jagannath University, Dhaka-1100, Bangladesh.

Rasedul Islam
Department of Botany, Jagannath University, Dhaka-1100, Bangladesh.

Hasna Hena Begum
Department of Botany, Jagannath University, Dhaka-1100, Bangladesh.

Kamrun Haher
Department of Botany, Jagannath University, Dhaka-1100, Bangladesh.

Abstract/ Executive Summary:

A pot experiment was conducted to investigate the effect of different concentrations (0, 10, 25, 50 and 100 ppm) of 2,3,5 Tri-iodo benzoic acid (TIBA) on growth of BRRI dhan44. With few exceptions LA, LAR, SLA and LAD showed almost similar trend and increased due to 10 ppm at all stages. Whereas, other treatments showed a decrease in most cases. Significant variations were observed at 40 DAS in LA, at 20 and 40 DAS in LAR and throughout the growing period of SLA and LAD. Significant increase was observed in SLW at concentration higher than 10 ppm TIBA. Plants treated with 25 ppm TIBA produced the highest SLW after 10 DAS. Maximum NAR was also recorded from 25 ppm at all phases of growth and varied significantly at 20-30 DAS. Application of TIBA had positive response on CGR in the majority cases and significant variation was observed at the period of 0-10 and 50-60 DAS. The RGR responded similarly like CGR, but varied significantly in all cases except at 10-20 DAS. After the period of 20-30 DAS, BMD were found to increase following all treatments excluding 50 ppm and significant variations were observed all over the growing period. Out of five treatments, 10 ppm TIBA showed better responses in the majority of growth parameters.

Keywords: BRRl dhan44, TIBA, Foliar application, Growth analysis

Location: Department of Botany, Jagannath University, Dhaka

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To evaluate the effect of TIBA on different growth parameters and yield of BRRl dhan44.

Methodology:

A pot experiment was carried out at the research Garden of the Department of Botany, Jagannath University, Dhaka. Each pot was filled with 6.0 kg air-dried soil. Urea, triple super phosphate, muriate of potash and gypsum were applied at the rate of 2, 6, 6 and 3 g per pot respectively (recommended by BRRl). Cow dung (0.5 kg/pot) was also mixed homogeneously during the pot preparation. The pots of experiment was laid out in a randomized complete block design (RCBD) with five replications, each having 8 pots. Total number of pot was 200 (5x5x8). Seeds of BRRl dhan44 were collected from Bangladesh Agricultural Development Corporation (BADC). Seeds were sterilized with 0.05 % calcium hypochlorite solution and repeatedly washed in distilled water to remove any trace of chemicals before sowing. Seedlings were grown in earthen pots. Three seedlings (at 4-leaf stage) were transplanted to pot at the age of 40 days after sowing. Thinning was done in such a way that a healthy seedling of uniform size and vigour was allowed to grow. Irrigation was done as per necessity. Weeding was done twice at 18 and 40 days after transplanting (DAT). Split applications of urea were done twice at the rate of 2 g per pot at 24 and 54 DAT. The experiment consisted of five foliar treatments: 0 (control), 10, 25, 50 and 100 ppm TIBA. Treatments were applied at 32 DAT. A total number of 10 plants (2 from each replication) was fixed from each treatment for data collection at definite interval except, destructive harvest, where, plants were collected from other pots. Data on leaf area (LA), leaf area ratio (LAR), specific leaf area (SLA), specific leaf weight (SLW), leaf area duration (LAD) and net assimilation rate (NAR) were recorded from the age of 10 days after spray (DAS) up to 40 DAS at an interval of \0 days. Crop growth rate (CGR), relative growth rate (RGR) and biomass duration (BMD) were recorded from the age of 0 DAS (date of foliar spray) to 60 DAS at an interval of 10 days. Leaf area was measured by length-width method. Growth parameters such as LAR, SLA, SLW, LAD, CGR, RGR and NAR were calculated using the classical growth analysis method. Data were analyzed statistically and treatment means were compared by LSD test at 5% level of significance.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 41 (1): 67-73, June 2015, ISSN: 1016-6947

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The overall results of this investigation indicated that TIBA has both stimulatory and inhibitory effect on different growth parameters and the magnitude of effect was relatively different depending on the concentration. Findings of the experiment 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. Out of the five concentrations, 10 ppm TIBA produced better stimulations in both growth and yield.

Knowledge Management: Journal