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Evaluation of Some Soil Test Methods for Phosphorus in Some Bangladesh Soils with Respect to Wheat

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:

Seven extraction methods were tried to evaluate a suitable method for determining available P from eleven soils representing 11 established soil series of Bangladesh with respect to wheat (Aghrani) grown under net-house conditions. 0.002 N H₂ S0₄ appeared to be the best method for all soils in extracting available P which gave high correlations with relative yield and P uptake, particularly at the flowering stage. 0.5M NaHC0₃ was found to be the second best method in estimating the availability of Phosphorus. The third method that correlated significantly with wheat yield and P uptake was 1M NaCl. Remaining methods also correlated significantly with plant parameters except Morgan and AS! with yield from control at the Dowering stage .

Keywords: Phosphorus. Extractant, Wheat plant

Location: Different locations of Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Wheat, Fertilizer

Objectives:

To find out a suitable method or methods for determining the available soil P for obtaining economic responses to P fertilizer application, particularly with reference to upland wheat crop.

Methodology:

Eleven soils representing 11 soil series from different locations of Bangladesh were selected for the present study. The soil samples were collected at a depth of 0-15 cm. from the surface and were dried. ground and passed through a 2 mm sieve and a 0.6 mm sieve. The 2 mm size samples were used for particle size analysis while the 0.6 mm size samples were used for various chemical analyses. pH of the soils was determined electrochemically at a soil : water ratio of 1 : 2.5; texture was determined by using the textural triangle of USDA after determining the percentage of sand, silt and clay; organic carbon was determined oxidation method and the organic matter was calculated by multiplying the organic carbon value with the factor. 1.724 ; total N was determine; available N was extracted by 1M NaC1 solution at pH 3.0 and determined by alkali distillation; available K was determined by flame photometer after its extraction by 1M NH₄0Ac. Available P was determined by using seven extractants viz. Bray and Kurtz No. 1. 0.002N H₂S0₄ buffered at pH 3.0. Morgan extractant, 0.5M NaHC0₃ at pH 8.5. Agro Services International ASI and 1M NaCl acidified to pH 3.0. The corresponding P-values are designated as Bray P₁, Bray P₂, P_HS PMG, P_NHC, P_AS, and P_NaC1 respectively.Total P uptake/ 100 plants (in g) were calculated by multiplying P per gram plant sample with the weight of 100 plant samples. Correlation coefficients between extractable P by different extracts and wheat yield of control. P uptake of control etc., were worked out.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 23 (2) : 195-204. 1997

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The observations, the principle of linear regression was applied. assuming that the relationship between available-P as measured by any one of the methods and the corresponding P uptake by plants to be linear, i.e., y = mx+c. It was observed from the estimated regression lines that most of the observed values (P-uptake) fell more or less closely to the regression lines at both the stages and the proximity of the values to the regression lines suggested that the relationships between Olsen's (P_NHC) reagent extractable P with their corresponding uptake by 100 plants at both stages was by far the best.

Knowledge Management: Journal