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Transformation of Nitrogen from Urea in Soil at Different Moisture Conditions

M. Idris
Department of Soil Science, Bangladesh Agricultural University, Mymensingh

F. A. Choudhury
Department of Soil Science, Bangladesh Agricultural University, Mymensingh

M. M. Mia
Department of Soil Science, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Transformation of urea-N placed in soil under air dry field capacity and saturated moisture conditions Is reported here. Hydrolysis of the added urea (13.5 mg per 100 gm soil) was over after 10 days of incubation. The soil at field capacity moisture gave the maximum amount of ammonium-N at that time. The nitrification rate was slow tor the first 25 days and increased sharply thereafter. Nitrification continued throughout the Incubation period (40 days). The field capacity soil gave the highest value of nitrate-N. There no nitrification in the saturated soil. This was due to anaerobic condition in the soil. The pH of the foil under field capacity and air dry conditions increased initially to a certain extent due to ammonification and then decreased continuously with time. The decrease in soil pH was due to nitrification. The pH of the field capacity soil was higher than that of the air dry one. The pH of the saturated soil on the other hand increased with time as there was no nitrification in this case.

Keywords: Transformation, Nitrogen, Soil, Moisture conditions

Location: Department of Soil Science, Bangladesh Agricultural University, Mymensingh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To know the nature of urea transformation in Tista Floodplain soil at three different soil moisture conditions at room temperature.

Methodology:

Soil sample from 0 to 15 cm depth representing the Tista Floodplain soil was collected from Rangpur district. The physical and chemical composition was determined. The air-dried soil was grounded and passed through a 2 mm sieve. After thorough mixing the soil was placed in 81 plastic bottles each containing 454 gms, Soil samples were then treated with urea at the rate of 13.5 mg of urea per 100 gm of soil. The experiment was conducted with three soil moisture regimes; air dry, field capacity and saturated conditions. Water at the rates of 106 and 200 ml per pot was added to bring the air dry soil to field capacity and saturated moisture conditions, respectively. After adding water the containers were tightly closed with lids. The experiment was replicated thrice. The containers were then randomly separated into nine groups having nine pots in each group and incubated at room temperature (28⁰ to 30⁰C) from 0 to 40 days during the months of March and April, 1972. At an interval of 5 days soil samples were analysed for ammoniacal-N, nitrate-N and soil pH. The ammoniacal-N and nitrate-N were determined by Nessler's and Phenoldisulphonic acid methods as described by Jackson and Black, respectively. The soil pH was determined by a glass electrode pH meter on a soil: water ratio of 1: 2.5.

Source of Information: Bangladesh J. Agril. Sci. 1 (2) : 123-127; 1974

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The soil at field capacity moisture gave the maximum amount of ammonium-N at that time. The nitrification rate was slow tor the first 25 days and increased sharply thereafter. Nitrification continued throughout the Incubation period (40 days). The field capacity soil gave the highest value of nitrate-N. There no nitrification in the saturated soil. This was due to anaerobic condition in the soil. The pH of the foil under field capacity and air dry conditions increased initially to a certain extent due to ammonification and then decreased continuously with time. The decrease in soil pH was due to nitrification. The pH of the field capacity soil was higher than that of the air dry one. The pH of the saturated soil on the other hand increased with time as there was no nitrification in this case.

Knowledge Management: Journal