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Effect of Organic Manure on Nutrient Contents of Rice Grown in an Arsenic Contaminated Soil

R. Ashrafi
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. H. R. Biswas
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

G. K. M. Mustafizur Rahman
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

R. Khatun
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. R. Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A pot experiment was carried out to study the effects of organic manures on nitrogen, phosphorus, potassium and sulphur concentrations in grain, husk, stem and root of rice grown in an arsenic contaminated soil. Randomized Complete Block Design with three replications was followed where each pot received an equal amount of N, P, K and S to sustain normal plant growth. N, P, K and S concentration in grain, husk, straw and root of rice plant were increased with organic manure application compared to control treatment. This study considered rice husk and root along with grain and straw as they have value to increase soil nutrient by recycling. Arsenic contamination becoming a concerning issue because its contamination in many agricultural soil is increasing following contamination in groundwater. This study concluded that organic manure is effective in arsenic contaminated soil to increase N, P, K and S concentration in rice plant.

Keywords: Organic manure, Nutrient, Rice plant, Arsenic contaminated soil

Location: In the laboratory of Soil Science Division, Bangladesh Institute of Nuclear Agriculture, Mymensingh

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Manures

Objectives:

A pot experiment was conducted to investigate the role of different manures on nutrient partitioning in Boro rice grown on an arsenic contaminated soil.

Methodology:

Arsenic contaminated soils were collected from Krishnagar union of Faridpur Sadar. The bulk soil (110 Kg) was collected at a depth of 0-15 cm. After collection, soil was prepared for initial chemical analysis in the laboratory of Soil Science Division, Bangladesh Institute of Nuclear Agriculture, Mymensingh. The unwanted materials like pebbles, plant roots, etc were removed from the bulk soil. The soil was dried in the sun and the clods were broken and followed by grinding and sieved with 2 mm sieve. The soil was silt loam in texture having pH 7.32. Initially chemical analysis was conducted to analyse this soil and found organic matter 1.92%, total N 0.31%, available P 19.4 ppm, exchangeable K 0.48 me%, available S 19.2 ppm and total As 54.54 ppm. Cowdung, poultry manure, wild aroids and water hyacinth were collected and kept in bucket for decomposition. After one month the organic manures were completely decomposed and then allowed to dry under sunlight. After drying, the composts were ground and sieved with 2 mm sieve. Finely ground sieved organic manures were kept in poly bag for initial chemical analysis and finally to use in pot for growing of rice. A pot experiment was carried out at the net house of BINA, Mymensingh during January to May, 2004. Fifteen plastic pots were taken, those were 16 cm in diameter and 17 cm in height. Two and a half kg soil was taken in each pot and then the soil was mixed with organic manure and chemical fertilizer. There were all together 15 pots comprising 5 different treatments with 3 replications. There were five treatments in the experiment- T₁: Control, T₂: Cowdung, T₃: Poultry manure, T₄: Water hyacinth compost and T₅: Wild aroids compost. The rate of compost application was 20 g/pot. Nitrogen (0.89 g/pot), phosphorus (0.238 g/pot), potassium (0.134 g/pot), sulphur (0.279 g/pot) and zinc (0.0043 g/pot) were applied from urea, TSP, MOP, gypsum and zinc oxide. Thirty days old healthy seedlings were transplanted in one hill at the central position of each pot. After transplanting 5- 6 cm water was maintained in each pot throughout the growth period. Top dressing of urea was done at the maximum tillering and panicle initiation stages. The crop was harvested on 15 May, 2004 at maturity. Roots of rice plants were separated from the stem. The rice husks were separated from the rice grain. The different plant parts were analysed for N, P and K using standard methods (Page et al., 1982). The analysis of variance for nutrient concentration was done following the F-statistics. The mean comparisons of the treatments were made by the Duncan's Multiple Range test (DMRT) (Gomez and Gomez, 1984).

Source of Information: Bangladesh J. Sci. Ind. Res. 45(3), 183-188, 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded that Organic manure is effective in arsenic contaminated soil where their application of organic manures increase N, P, K and S in rice grain, husk, straw and root. These increased nutrients in straw and root can be added again to soil by recycling. However, studies under field condition are necessary to validate the present findings and further investigation is needed to observe the effect of organic manures on rice grown on As contaminated soil and uncontaminated soil to make a comparison.

Knowledge Management: Journal