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

Phosphate Status of Some Sub-humid Tropical Soils of Bangladesh

A . H. Khan
Department of Soil Science, Unhwsity of Dhaka, Bangladesh.

R. Mandal
Department of Soil Science, Unhwsity of Dhaka, Bangladesh.

T. H. Khan
Department of Soil Science, Unhwsity of Dhaka, Bangladesh.

S. M. Imamul Huq
Department of Soil Science, Unhwsity of Dhaka, Bangladesh.

S. Begum
Department of Soil Science, Unhwsity of Dhaka, Bangladesh.

A. Islam
Department of Soil Science, Unhwsity of Dhaka, Bangladesh.

Abstract/ Executive Summary:

Amounts of total, inorganic, organic and inositol phosphates varied significantly and ranged from 242 to 620, 143 to 404, 63 to 307 and 36 to 188 ppm with an average of 436, 263, 169 and 86 ppm, respectively. Inorganic and organic phosphates accounted for 49 to S I percent and 19 to 51 per cent of total phosphates, respectively. Inositol phosphate constituted about 42 to 66 per cent of organic phosphates. Correlation studies suggested that insignificant variation in total, inorganic and organic phosphates were related to clay, organic carbon and total nitrogen contents of the soils. However, the most influencing variable was the clay content for their variation in soils. Organic carbon was also significantly responsible for the accumulation of organic phosphate. Inositol phosphate was directly and significantly associated with the amount of soil organic phosphates and clay contents. Inconstant, pH showed no significant contribution for the accumulation of any form of phosphate in the soil. However, multiple correlations ascertained that all these properties contributed together for any change in the level of phosphate fractions in soil.

Keywords: Phosphate status, Tropical soils, Soil nutrient, Phosphate status.

Location: Dhaka, Comilla, Chittagong, Noakhali, Feni, Narshingdi, Khulna, Tangail and Dinajpur districts, Bangladesh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To assess the various fractions of phosphate in some sub-humid tropical soils of Bangladesh.

Methodology:

Soil samples (0-15 cm) were collected from sixteen representative series of the districts of Dhaka, Comilla, Chittagong, Noakhali, Feni, Narshingdi, Khulna, Tangail and Dinajpur. The samples were air dried ground and passed through 2 mm sieve for mechanical analysis and through 0.5 mm sieve for chemical analysis. Mechanical analysis was done by hydrometer method and that or textural class was determined from USDA triangular coordinate system. pH was measured electrochemically by using Corning glass electrode pH meter Model-7) from a soil suspension (soil : water = 1:2.5) and that of CEC from 1N neutral N H₄0Ac extract. Organic carbon was estimated volumetrically by wet oxidation method and total nitrogen was determined by Kjddahl procedure. The physical and chemical properties of the soils arc presented. Total, inorganic and organic: phosphates were estimated by following the method outlined. Procedure devised used to determine the inositol phosphate contents of the soils.

Source of Information: Bangladesh J. Sci. Ros. 7(I), 1989 : 11 - 19

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The importance of clay was more justified when all possible correlation coefficients were considered. The combination of factors, where clay content was included, showed better correlation s than those without clay. For example, the value of r was 0.7545 when organic carbon, Total nitrogen and pH were included together. But when Clay content of the soils was included along with these factors, the value of r increased and became 0.9190. This possibly explain the significance of clay in the variation of total phosphates in soil. However, a better relation from multiple correlation suggested that clay, organic carbon, total nitrogen and pH contributed together for the variation of total phosphates in soil The variation of inorganic phosphates was found to be significantly related to total nitrogen, total phosphates, clay and organic carbon contents of the soils. Non-significant and negative relation ship was recorded with soil pH. Variation in inorganic phosphates with these soil properties- was also proposed by other workers. A partial correlation indicated that apart from total phosphates two other properties namely, organic carbon and clay content of soils are responsible for the variation of inorganic phosphate contents. However, a multiple correlation suggested that all these soils properties are involved for any change in inorganic phosphate level in the soil. From the consideration of partial correlation, variation in organic phosphates was found to be related mainly with total phosphates followed by clay content of the soils. However, multiple correlation revealed that all the soil variables included in the study was jointly responsible for such variation. Inositol phosphate showed significant relationship with only clay and organic phosphate contents of soils. Partial correlation suggested that organic phosphates explain most of the variations of inositol phosphate in soil. However, multiple correlation revealed that all the variables were responsible combinedly for the variation of inositol phosphate.

Knowledge Management: Journal