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Effect of Addition of Varying Levels of Sodium as Chloride and Sulphate on Nitrogen Mineralization During Aerobic Incubation of Two Bangladesh Soils

M.S. CHOWDHURY
Department of Soil Science, Dhaka University, Bangladesh.

S. M. IMAMUL HUQ
Department of Soil Science, Dhaka University, Bangladesh.

Abstract/ Executive Summary:

The effects of addition of 0.1, 0.25, 0.50 and 1.00% NaCI and equivalent levels of Na + as Na₂S0₄ on N-mineralization and nitrification were studied after 6 weeks of aerobic incubation of Fatki series soil ( F-soil, pH 7.6) and Tejgaon series soil ( T-soil, pH 4.9 ). In the F-soil, N-mineralization was not affected by 0. 1% NaCI , was decreased by 0.25% and was stopped by 0.50 and 1.00% levels; nitrification decreased with increasing NaCI, but did not completely stop even at 1.00%. In the equivalent sulphate series, N-mineralization and nitrification were not affected by 0.1 to 0.5% levels, the 1.00% level however, moderately depressed both the processes. In the T-soil, N-mineralzation was not affected by any level of Nacl; nitrification was greatly affected by 0.1% NaCI and stopped by the higher levels. In the equivalent sulphate series, N-mineralization was not affected by 0.1 to 0.5% levels but was increased some what at 1.00% ; nitrification declined considerably with increased sulphate to 0.25 % and was stopped by the higher levels.

Keywords: Varying levels of sodium as chloride and sulphate, Nitrogen mineralization, Aerobic incubation, Bangladesh soils

Location: Dhaka University

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To study the effects of adding varying levels of Na⁺ as chloride and sulphate on N-mineralization and nitrification during aerobic incubation of a slightly alkaline and an acid soil of Bangladesh .

Methodology:

Samples of soils representing two soil series were selected for the study. These series include the F:Hk i and Tejgaon. Samples of the two soils were collected from the top 25 cm over several years.. The Fatki series of soil is designated as F-soil and tile Tejgaon series soil as T soil in the text. The composite samples were air dried and passed through a I mm sieve. The F-soil had a pH of 7.6 (soil : water ratio 1 : 2.5) and contained 24 clay, 38 { silt, 35% sand, 0 .55 organic carbon, O.O8l% total-N, 41.8 ppm ammonium-N and 11.2 ppm nitrate-N. The T-soil had a p^H of 4.9 :and contained 26 % clay, 22 % silt , 52% sand, 0.55 •:, organic carbon, 0.069 % total-N, 101.4 ppm ammonium-N and 4.0 ppm nitrate-N. Bulk quantities of both soil types were mixed with finely ground NaCl t o supply 0.1, 0.25, 0.5 and 1.0% levels of N:-.+ on the dry soil b:-.sis. Further quantities of both soils were mixed with finely ground Na S0₄to supply the same levels of Na+ as in the chloride series, 10 g portions of each treatment and control (no added Na+) were set up in triplicate in 10 cm x 2.5 cm diameter glass tubes and was added to 50 , (saturation (an aerobic moisture content). The barium peroxide method (5) was used for aeration and absorption of C0₂ during incubation (30⁰C) of the tubes, which were closed with rubber bungs. After incubation (6 weeks) the soils were shaken with 10 ml water and the p^Hand the Ec of the suspensions determined. Then 10 ml ot' 2N KCI was added and after vigorous shaking the tubes were centrifuged. The supernatant liquid was analysed for ammonium and nitrate-N by micro diffusion method .

Source of Information: Bangladesh J. Sci. Res. 6 ( 1 & 2), 1988 : 23-28

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the F-soil, N-mineralization was not affected by 0. 1% NaCI , was decreased by 0.25% and was stopped by 0.50 and 1.00% levels; nitrification decreased with increasing NaCI, but did not completely stop even at 1.00%. In the equivalent sulphate series, N-mineralization and nitrification were not affected by 0.1 to 0.5% levels, the 1.00% level however, moderately depressed both the processes. In the T-soil, N-mineralization was not affected by any level of Nacl; nitrification was greatly affected by 0.1% NaCI and stopped by the higher levels. In the equivalent sulphate series, N-mineralization was not affected by 0.1 to 0.5% levels but was increased some what at 1.00% ; nitrification declined considerably with increased sulphateto 0.25 % and was stopped by the higher levels.

Knowledge Management: Journal