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

Physico-chemical Changes of Paddy Soils Under Long-term Intensive Fertilization

M.S.H. Khan
Department of Soil Science, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh.

M.J. Abedin Mian
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Afrin Akhter
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

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

Abstract/ Executive Summary:

The main objective of this experiment was to evaluate the impact of intensive fertilization and cropping on some physical and chemical properties of soil. Low bulk density and high pore volume remain in surface layer than the subsurface layer due to long-term fertilization. Laboratory experiment was carried out with soil samples (Sonaltola silt loam) from different depths of a permanent manurial experimental field of the Department of Soil Science, Bangladesh Agricultural University (BAU) farm, Mymensingh. Relatively low bulk and particle densities were found in FYM treated soil. Results showed that P and FYM are more effective in maintaining large aggregate in soils. Lowest amount of >2mm size aggregate and highest amount of 0.1-0.01 mm size aggregates were obtained in NS plot due to solubility of gypsum in water. Soils of surface layer were slightly acidic to neutral and the sub-surface layer was alkaline having pH values ranging from 6.81 to 7.11 and 7.48 to 7.85 in 0-10 and 10-20 cm layers respectively. The status of total organic matter, total nitrogen, available P and S also decreased with increasing depth although the status varied widely among the treatments and decreased due to treatments in which P was not included.

Keywords: Long-term fertilization, Changes in soils properties,

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

Start Date: 00-00-1998

End Date: 00-00-1999

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To determine the impact of long-term fertilization on the physical characteristics of paddy soils.

Methodology:

A laboratory experiment was carried out with soils collected from a permanent manurial experimental field of the Department of Soil Science, Bangladesh Agricultural University Farm, Mymensingh, Bangladesh during the period of 1998-99 (after two decade of starting the permanent experiment). This farm belongs to the Sonatola Series under the general soil type of non-calcareous dark grey floodplain alluvium. This may be correlated with Aeric Heplaquapt of USDA soil taxonomy and Eutic Gleysol of FAO-UNESCO soil unit. This manurial experimental plot was started in the year 1978. The initial soil was silt loam in texture having pH 6.8, organic matter 2.16%, total nitrogen 0.06%, available phosphorus 9.0 mg kg^-1, available potassium 0.20 cmol kg^-1 as mentioned. The treatments included, control, N, NP, NPK, NS, NPKSZn, NFYM and NPKFYM. The fertilizer doses used in the experiments were 60 kg N ha^-1 from urea, 20 kg P ha^-1 from TSP, 15 kg K ha^-1 from MP, 30 kg S from gypsum. Collected soil samples from various depths (0-10 and 10-20 cm) were collected, grind, sieved and preserved in polythene bag for analysis. Particle size analysis of soil was done by hydrometer method[9] and the textural class was determined by plotting the values for sand, silt and clay% in the Marshall’s triangular co-ordinate following USDA system. Particle density and bulk density was determined by volumetric flask method and core sampler method respectively. Total porosity of soil calculated from bulk and particle density after Vomocil. Water stable aggregate were determined following the method described. Total soluble salts was estimated from electrical conductivity of aqueous soil extracts from 1:5 soil:water suspension. Soil pH was measured by glass electrode pH meter as outlined. Total nitrogen was determined by semi micro kjeldahl distillation method. Available P and available S was determined after Olsen et al.. Amount of organic matter, CEC, exchangeable K and exchangeable Ca was determined.

Source of Information: Asian Journal of Plant Sciences Volume 5, Number 1, 105-111, 2006

Article Link (Online Journal): DOI: 10.3923/ajps.2006.105.111, URL: http://scialert.net/abstract/?doi=ajps.2006.105.111

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The status of total organic matter, total nitrogen, available P and S decreased with increasing depth although the status varied widely among the treatments and decreased due to treatments in which P was not included.

Knowledge Management: Journal