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A Study on Some Chemical Composition of Soil Solution of Paddy Soils of Different Fertility in T-aman Season

S.G Azam
BRAC, Aditmari, Lalmonirhat

M.A Hossain
Mymensingh Agricultural Institute, Sadar, Myrncnsingh

A.K. Saha
OFRD, Rangpur

M.M. Hossain
Faruq Fertilizers Ltd. Dhaka

M.J.A. Mian
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

An experiment was conducted in the permanent manurial experimental field of the Department of Soil Science, Bangladesh Agricultural University Farm. Mymensingh from August to October, 2000 to evaluated the changes in some chemical properties of surface water and soil solution during T. Aman season due to the effect of different organic and inorganic fertilizer combinations. There were 10 treatments viz. 0 (control), N, NP, NPK, NSZn, PKSZn. NFYM. NPFYM and NPKFYM. Samples were collected at an interval of 15 days and analyzed for pH, EC, Phosphorus and soluble potassium. Analyzed of soil solution showed wide variation due to different treatment combinations, fertilization and time. The concentration of K+ and Phosphate after fertilization but decreased with the increase of time. The fertilizer treatments in general increased the concentration of all properties over the control although remarkable variations were noted between the treatments in different periods.

Keywords: Surface water, Soil solution and T-Aman

Location: Department of soil Science, Bangladesh Agricultural University Farm, Mymensingh

Start Date: 00-08-2000

End Date: 00-10-2000

Program Area: Crop-Soil-Water Management

Commodity: Rice, Soil fertility

Objectives:

To see the changes in chemical properties of soil surface water and of soil solution during T-aman season due to applied combination of different organic and inorganic fertilizers.

Methodology:

The experiment was carried out in the permanent manurial experiment field of the Department of soil Science, Bangladesh Agricultural University Farm, Mymensingh from August 2000-0ctober 2000. The soil was silt-loam in texture. The morphological, physical and chemical characteristics of the soil have been shown. The total number of plots were 30 and the plot size was 5m x 4m. The experiment was laid out in a randomized completed block design with three replications. Dykes of 25 cm wide separated the unit's plots from each other. Block to block distance was 1 m.Ten treatments were considered for the present study. The:y were 0 (No fertilizer added), N, NP, NPK, NSZn, NPKSZn, NFYM, NPFYM, NKFYM and NPKFYM. The rate of N, P, K, S, gypsum, Zn and FYM were 123, 91, 80, 300, 12 gm and 12 kg/plot respectively. Surface water samples were collected from 3 spots of each of three replicated plots of the treatments.Soil solution at the depth of 0-10 cm was collected using perforated plastic bottles. Both the samples surface water and soil solution were collected at an interval of 15 days from August 1 to October 30, 2000. Collected sample was filtered and analyzed on the same day for p^H , EC, and NH₄⁺ concentration. p^H of surface water and soil solution was determined by glass electrode p^H meter using soil: water suspension of 1:2.5 as described. Phosphorus was determined by developing blue color by SnCI₂ reduced phosphomolybdate complex and measuring the intensity of color calorimetrically at 660 nm wave length and calibrating the readings to the standard phophorus curve. Soluble potassium was determined by flame photometer and comparing the readings to standard curve prepared for potassium. Data were statistically analyzed using the "Analysis of variance" technique with the help of computer package MSTAT. The mean differences were adjudged by Duncan Multiple Range Test.

Source of Information: Bangladesh Journal of Environmental Science. Vol. 13, No.1, pp: 71-76, 2007

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The experiment may be summarized as follows: The pH values differed significantly due to different fertilizer treatment both in surface water and in soil solution. In surface water pH values ranges form 7.09 to 8.15. Incase of soil solution. Electrical conductivity differed significantly both in surface water and soil solution on all the sampling dates. The values of EC increased due to application of fertilizers at different dates but decrease with the passes of time after fertilization. The different fertilizer treated plots showed considerable variations in K content of both surface water and soil solution. Concentration of potassium was the lowest among the nutrients studies. Its concentration was also influence by N, P, K and S fertilizers among which NH₄ showed major influence on K concentration of soils. Phosphorus concentration of soil solution and surface water showed almost similar trend like the K. Phosphorus on the other hand showed a strong gradual increase up to 30 days after fertilization and then decreased considerably due to plant uptake.

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