Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Use of 15n Labelled Urea to Quantify Nitrogen Recovery Studies and Effect of Salinity on Rice

M. N. Mondol
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh

A. S. Chamon
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh

R. C. Hood
Soil Science Unit, IAEA, Seibersdorf, Austria, and

W. E. H. Blum
Dept. of forest and Soil Sciences, University of Natural Resources and Applied Life Sciences (BOKU), Vienna, Austria.

Abstract/ Executive Summary:

An experiment was conducted to study the effects of salinity, and fertilisation on wetland rice production. It was a factorial design with four levels of salinity and three levels of fertilisation. Rice plants were grown in wetland system under greenhouse conditions. Fertiliser treatments were imposed at planting. Following germination salinity treatments were imposed. Plants and soils were sampled 10 weeks after planting. Plant dry weight increased with increasing inorganic fertiliser application and decreased with increasing salinity. Total shoot N increased with increasing inorganic fertiliser application but was not affected by salinity, however total root N increased with increasing inorganic fertiliser addition and decreased with increasing level of salinity (0, 50 and 100 ppm). Plant dry weight decreased with increasing salinity. Plant dry weight and N contents in shoot and root were significantly higher in all inorganic fertiliser treatments compared to the control treatments. % Ndff was in the range of 30-50 % and increased with increasing fertiliser application and salinity. Fertiliser use efficiency was in the range of 67.87-72.8 % in the inorganic fertiliser treatment.

Keywords: 15N Labelling; Nitrogen recovery; Salinity; Rice

Location: FAO/IAEA Agriculture and Biotechnology Laboratories, Seibersdorf, Austria

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Rice

Objectives:

Measurement of the effect of salinity and fertiliser source on rice yield.
Quantification of the amount of nitrogen derived from fertiliser (Ndff) in rice.
Quantification of the amount of nitrogen derived from soil (Ndfs) in rice.
Quantification of the amount of residual N in soil.

Methodology:

The experiment was conducted at the FAO/IAEA Agriculture and Biotechnology Laboratories, Seibersdorf, Austria. This experiment was conducted to study the effects of salinity and fertiliser on wetland rice production. The experiment was a factorial design with four levels of salinity (0, 4, 8, 12 ds m-1), one labeled fertiliser source, i.e. inorganic fertiliser (5 atom% 15N exc.-labelled urea) and three levels of fertilisation (0, 50, 100ppm N). Two rice plants (variety- Pokkali) per pot were established in 2.5kg of Krumbach soil (a sandy loam soil collected from a pasture system in lower Austria; Table I) and which was supplemented with 50ppm K (applied as KCl) and 20ppm P (applied as KH2PO4) with three replications as a basal dose. Fertiliser treatments were done at planting. The fertiliser was mixed with the initial soils. Following germination, one week after planting, salinity treatments were imposed; this was done by watering the plants with saline solutions. Pots were harvested for above and recoverable below-ground material 10 weeks after planting and soil and plant samples were analyzed for %N and N atom excess.

Source of Information: Bangladesh J. Sci. Ind. Res. 49(2), 69-78, 2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

% Ndff was increased with increasing rates of fertilizer application and salinity. % Ndfs was in the range of 44-66%. Fertilizer use efficiency was in the range of 67-72%. Nitrogen remained in the soil after harvest of rice was the highest in the highest rate (100 ppm) of 15N urea applied pots.

Knowledge Management: Journal