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Effects of Lead on Some Growth Parameters of Rice (oryza Sativa L.)

M.G. KIBRIA
Professor
Department of Soil Science, University of Chittagong, Chittagong 4331, Bangladesh.

K.T. OSMAN
Professor
Department of Soil Science, University of Chittagong, Chittagong 4331, Bangladesh.

M.J. AHMED
Professor
Department of Chemistry, University of Chittagong, Chittagong 4331, Bangladesh.

Abstract/ Executive Summary:

Rice (Oryza sativa L.) was grown in earthen pots containing soils of three different textures (clay loam, sandy clay loam and sandy loam) and treated with six levels (0, 10, 20, 30, 40, 50 mg kg-1) of lead. The effects of lead on agronomic parameters of rice plants were recorded. Plant growth was affected by the lead treatments. Plant height was significantly reduced at the highest Pb treatment in sandy loam soil. The number of tillers started to reduce significantly at 30, 40 and 50 mg kg-1 soil treatment in sandy loam, sandy clay loam and clay loam soil, respectively while the number of panicles reduced from 40 mg kg-1 soil treatment in all the three soils. A depressive effect of lead on grain formation was observed. Grain yields were significantly reduced by the highest Pb treatment. Dry matter yield reductions were 10 to 25 % at the highest rate of Pb application.

Keywords: Lead, Rice, Tiller, Panicle, Grain yield.

Location: Chittagong University

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To investigate the effects of Pb on growth and yield of rice which is the staple food of Bangladesh.

Methodology:

A pot experiment was conducted to investigate the effects of Pb on some growth parameters of rice plant. Rice was grown on three different textured soils namely clay loam, sandy clay loam and sandy loam. Soils used in the experiment were collected from (i) agricultural field near new Science Faculty of Chittagong University (Clay loam soil), (ii) agricultural field near Shahid Minar of Chittagong University (Sandy clay loam soil) and (iii) Syedpara at Hathazari Upazilla under Chittagong district (Sandy loam soil) from a depth of 0-15 cm on the basis of composite sampling method. Before setting for pot experiments, textural classes of the soils were determined. Soil samples were air dried, larger and massive aggregates were broken down by gentle crushing with wooden pluck. Dry roots, grasses and other particulate materials were removed from the soils and processed for pot experiment. A portion of the soils passed through 2.00 mm sieve was used for laboratory analyses. Eight kilograms soils were placed in each earthen pot. The treatments of Pb (0, 10, 20, 30, 40 and 50 mg kg-1 soil) were applied in soil in solution form as Pb(NO3)2. Each treatment was replicated thrice and the pots were arranged in randomized block design. The doses of nitrogen (as Urea), P (as Triple super phosphate), K (as Muriate of potash) and S (as Zinc sulfate) were applied in the pot experiment (110, 25, 60 and 15 kg ha-1 soil, respectively). According to BARC (1997) recommendation, 1/3 N and whole of P, K, S were applied during soil preparation. The second 1/3 N at rapid tillering stage and the rest 1/3 N were applied as broadcast before 5-7 days of panicle initiation. Four seedlings of 30 days old and of uniform size of a high yielding rice variety, BR 29, were transplanted to soil in each pot. The level of standing water at a height of 2.5 (±0.5) cm above the soil surface was maintained by periodic addition of tap water. Growth parameters such as plant height and tiller number were recorded at 70 days after transplantation (DAT) and panicle number, dry weight of straw and grain yield were recorded at maturity. At maturity, rice plants were harvested just above the soil surface level and separated into straw and rice grain. Roots were collected carefully and washed thoroughly with tap water first to remove adhering soil particles and then with distilled water. The straws were also washed to remove dust particles. The experimental data were statistically analyzed. The significance of differences between the means of the treatments was evaluated by one way analysis of variance followed by Duncan’s Multiple Range Test at the significance level of 5%.

Source of Information: Chittagong Univ. J. Biol. Sci.,Vol. 1(1):65-72,2006.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Application of Pb reduced plant height, number of tillers, number of panicles of rice. Grain formation process was also depressed and grain yield was reduced by Pb application.

Knowledge Management: Journal