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Fractions of Native Zinc in Some Soils of Bangladesh

A.K.K.M. Hossain
Dept. of Soil Science, Hajee Muhammad Danesh Agricultural College, Dinajpur.

Sultana Ahmed
Soil Science Division Bangladesh Institute of Nuclear Agriculture P.O.Box No.4, Mymensingh

M" Jahiruddin
Dept. of Soil Science, Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

Distributions of Zn fractions into different chemical forms and their relationship with soil properties have been studied on five major soil groups (0-15 em) of Bangladesh. The result showed positive correlation between available and total Zn and a significant negative correlation between available Zn and soil pH. The amount of various Zn fractions followed the order as, residual Zn > occluded Zn > complexed Zn > organically bound Zn > exchangeable Zn > water soluble Zn. Most of the total Zn in soil was present in residual form (77.2 - 93.7 %), the mean value of which being 89.1 percent. Further, an evidence on the existence of dynamic equilibrium amongst the different Zn fractions in soil was observed.

Keywords: Native,Zinc,Soil,

Location:

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To study the different chemical fractions of Zn in soil in order to assess inherent capacity of these soils to supply Zn to crops.

Methodology:

The investigation was carried out on eight soils from different locations namely, Kushtia, Jessore, Jamalpur, Khulna, Madhupur. Fulbaria, Bogra and Pabna representing five major soil groups of Bangladesh. Soil samples were collected from the farmers field at 0-15 em depth. The soils were air dried. ground, seived through 2 mm seive and used for physico-chemical and Zn fractionation studies in the laboratory. The soil p^H,mechanical composition, CEC and organic matter were determined following the procedure described by Page et £II., (1982). Total Zn was measured by digesting the soils with HF + Hcl0₄ mixture (Page, et al, 1982). Available Zn and P were determined by 0.1 N Hcl and O.SM NaHC0₃ extraction method, respectively. Fractionation of soil for different fractions of Zn was done on 5 g soil «2 mm), following the method of Smith and Shoukry (1968) as modified by Iyengar and Deb (1977). The various Zn fractions as determined were : water soluble, exchangeable, complexed organically bound, and occluded. The residual Zn was calculated by subtracting sum of the five Zn fractions from total Zn. Zinc in the extracts was determined with the help of atomic absorption spectrophotometer

Source of Information: Bangladesh 1. Nuclear Agric. 9 73-84, 1993

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The result showed positive correlation between available and total Zn and a significant negative correlation between available Zn and soil pH. The amount of various Zn fractions followed the order as, residual Zn > occluded Zn > complexed Zn > organically bound Zn > exchangeable Zn > water soluble Zn. Most of the total Zn in soil was present in residual form (77.2 - 93.7 %), the mean value of which being 89.1 percent. Further, an evidence on the existence of dynamic equilibrium amongst the different Zn fractions in soil was observed.

Knowledge Management: Journal