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

Influence of Clay, Active Iron Content and Ph on Phosphorus Sorption of Some Rice Soils of Bangladesh

N.I. Bhuiyan
CSO and Head
Soil Chemistry Division, BRRI, Joydebpur, Gazipur-1701, Bangladesh.

A. Saleque
SSO
Soil Chemistry Division, BRRI, Joydebpur, Gazipur-1701, Bangladesh.

P. K. Saha
SSO
Soil Chemistry Division, BRRI, Joydebpur, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

Eight surface soil samples collected from different rice growing areas of Bangladesh were used to study the relationship between phosphorus sorption capacity and active iron, manganese, calcium and clay content. Results show that the sorption capacity of the soils varies from 3 to 13 ppm at 20 ppm added P. Correlation studies show that the P sorption capacity of soils was closely correlated with Fe_D (r = 0.81) and clay content (r = 0.78) followed by Ca (r=0.65) and pH (r=O.64). The multiple regression equation (P sorption P_s = - 3.83 + 14.03 Fe_D + 0.16 clay; R ² = 0.82) suggested that the active Fe and clay contents of soil play an important role in P sorption capacity of soil.

Keywords: Clay, Active iron, pH ,Phosphorus,Sorption,Rice

Location: Madhupur tract, Young Brahmaputra flood plains,Old Brahmaputra flood plain, Ganges river flood plain, Barind Tract and Karatoya Tista flood plain soils of Bangladesh Madhupur Tract, Young Brahmaputra flood plains, Old Brahmaputra flood plains, Ganges river flood plain, Barind Tract and Karatoya Tista flood plain soils of Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To investigate on the relationship between phosphorus sorption capacity with that of the clay,active iron content and pH of rice soils

Methodology:

Soil samples, totalling eight were collected from Kalma, Khilgaon, Savar Bazar, Ghatail, Silmondi, Belabo and Domar series of Madhupur Tract, Young Brahmaputra flood plain, Old Brahmaputra flood plain, Ganges river flood plain, Barind Tract and Karatoya Tista flood plain soils of Bangladesh.The samples were air dried, crushed and passed through 2.0 mm sieve. The soils were all acidic in nature with pH 4.4-6.0. The soil samples were analyzed for Fe by ASI method (Fe_A₎ (Hunter 1984) and dithionite method (Fe_D) (Mehra and Jackson 1960), Mn by ASI method (Mn_A) and dithionite method (Mn_D), Ca by ASI method and clay by hydrometer method. Organic carbon was determined by Walkley and Black method. The soil samples vary in Fe_A content (26 to 447 ppm), Fe_D content (0.26 to 0.83%), Mn_A content (19 to 157 ppm),Mn_Dcontent (39 to 442 ppm), Ca content (0.3 to 25.0 meq/100 g soil). The clay content of soil varied from 9 to 53% and organic carbon content (0.8 to 1.8%) . Phosphorus sorption capacity was determined following ASI method as well. A portion of 2.5 g soil was taken in 100 ml polyvinyl bottles. A portion of 2.5 ml phosphorus solution containing 0, 20, 40, 80, 160 and 320 ppm P were added to the respective bottle. Each treatment was replicated three times. Polyvinyl bottles containing soil and P solution were kept in the room temperature to allow the P to react with soil in saturated condition. As the soil dries gradually, it gets the chance of reaction at different moisture condition. This simulates in a short period of time the kind of reactions which may be expected to take place under field condition. The soil samples became dry after 3 days. At 4th day, the treated samples were analyzed for P by ASI method. A portion of 25 ml extracting solution (0.25 N NaHC0₃ + 0.01 N NH₄F + 0.01 M disodium EDT A) was added to each bottle and was shaken for 10 minutes, After filtering P color was developed by using antimony trioxideascorbic acid reagents.The blue color of P was measured by a spectrophotometer at 680 nm wave length. The difference between added P and extracted P was considered as sorped P. Sorption of P at 20 ppm solution treatment was tried to correlate with Fe_A' Fe_D, Mn_A' Mn_D, Ca, clay, pH and org. C.

Source of Information: Bangladesh J.Sci.Res. 10(2) : 171-177, 1992 (January)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results show that the sorption capacity of the soils varies from 3 to 13 ppm at 20 ppm added P. Correlation studies show that the P sorption capacity of soils was closely correlated with Fe_D (r = 0.81) and clay content (r = 0.78) followed by Ca (r=0.65) and pH (r=O.64). The multiple regression equation (P sorption P_s = - 3.83 + 14.03 Fe_D + 0.16 clay; R ² = 0.82) suggested that the active Fe and clay contents of soil play an important role in P sorption capacity of soil.

Knowledge Management: Journal