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

Effect of Soil Properties on the Extraction of Phosphorus from Some Representative Bngladesh Soils

S. M. Imamul Huq
Department of Soil Science, University of Dhaka, Dhaka-1000, Bangladesh

Meheruna Akter
Department of Soil Science, University of Dhaka, Dhaka-1000, Bangladesh

M. Didar-Ul-Alam
Department of Soil Science, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

The present investigation was undertaken to identify some soil properties regulating P extractability by seven extractants in eleven selected soils of Bangladesh . The ability of the extractants to extract .oil P followed the order:O.SM NaHC0₃ (pH 8.5) > 0.25N NaH CO₃ 0.01M EDTA-0.01M NH₄F>0.31N NH₄F + 0.01N HCl > 0.03N NH₄F+ 0.025N HCl > 0.002N H₂S0₄ > 100g NaOAc in 30 ml CH₃COOH/litter > 1M NaC1 (at pH 3.0). The best correlation was found between p_HS and PNaCl (r = 0.917, P= 0.001). For acid soils (pH < 7.0) the amounts of phosphorus removed by different extractants were positively correlated with their organic carbon content . The soils were classified on the basis of the soil properties studied.

Keywords: Soil Properties, Soil Phosphorus. Extractant

Location: Department of Soil Science, University of Dhaka, Dhaka-1000, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To evaluate seven commonly used P extractants in order to identify some factors regulating P extractability of eleven extensively occurring representative soil series of Bangladesh and
To classify the soils on the basis of those properties.

Methodology:

The soil samples were collected at depths of 0-15 cm from the surface and were dried, ground and passed through a 2 mm sieve for mechanical analysis and through a 0.6 mm steve for various chemical analyses. Particle size distribution was measured by hydrometer method as described by Day (5) and the textural classes were determined following the USDA system (6). Soil pH was measured electrochemically using a glass eelectrode at a soil: water ratio of l :2.5. Organic carbon was determined by wet oxidation method . Total nitrogen was determined by alkali distillation of the Kjeldahl digest as described. CEC was determined by using neutral 1N NH₄0Ac method . Available soil K was measured by flame photometer at 769 nm. Available P in the extracts were determined using either SnC1₂ or Ascorbic acid as the reductant.

Source of Information: Dhaka Univ. J. Bioi. Sci. 6(2): 167-172, 1997 (July)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The best correlation was found between P_HS and P_NaC1 (r = 0.917) followed by the correlation between Bray P₁ and Bray P₂ (r = 0.902). P_NHC and P_AS (r = .879) and Bray P₂ and P_HS (r- 0.711). The better correlation values indicate that although the ability for P extraction was different for the different extractants, their trends of P displacement from soil to solution were approximately similar for the pair of extractants. The relationship between the amounts of P extracted by any pair of extractants is not necessarily linear. The available P of all the soil series used in the present investigation were low for Truog extractant (P_HS) according to (4). The highest value for total N was 0.19% for Kalma series soil and the lowest value was 0.04% for Ranisankail series soil. The total N in most Bangladesh soils ranges from 0.01 to 0.18% (18). The present findings are consistent with the recorded values. The significant positive correlation between PAS and organic carbon suggests that organic matter complexation with phosphorus did not exist at the low soil pH. As a result, PAS extractant easily extracted the organic matter associated phosphorus. Suggested that the variation of inorganic phosphate was significantly related to organic carbon contents and negatively but non-significantly with pH of some sub humid tropical soils of Bangladesh. Variation in inorganic phosphates in the soil with the soil properties have also been shown by other workers (20.21).

Knowledge Management: Journal