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Fertilizer Management Effects on Fertility of Old Brahmaputra Flood Plain Soil Under Rice Cultivation

A. Sultana
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202

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

M.S. Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202

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

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

Abstract/ Executive Summary:

An experiment was carried out during aman season of 2012 in the permanent experimental field of the Department of Soil Science, Bangladesh Agricultural University (BAU) Farm, Mymensingh. The objectives of the present study were to observe the impacts of 34 years of fertilization on yield of BRRI dhan 49 and soil properties. The experiment was laid out in a randomized complete block design with three replications. There were 6 treatments viz, 0 (control), N, NP, NPK, NPKSZn and NFYM. The experiment covered the period from 16 July to 22 December 2012. Due to long continued cultivation of wet land rice, the amount of organic matter and total N increased in soil over initial level. Soil pH decreased in control, N and NP treated plots but remained static in NPK, NPKSZn and NFYM treated plots. The P content of soil increased in P treated plot over control. The available S status increased in soil due to NPKSZn and NFYM treatments. The status of K reduced very strikingly over initial values in all treatments.

Keywords: Fertilizer management, Soil chemical properties, Grain and straw yields

Location: Department of Soil Science, Bangladesh Agricultural University (BAU) Farm, Mymensingh.

Start Date: 16-07-2012

End Date: 22-12-2012

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1. To evaluate the long-term effects of manures and fertilizers on the yield of BRRI dhan 49 and to observe the long-term effect of manure and fertilizers on soil chemical properties.

Methodology:

The experiment was carried out with soil samples collected from permanent manurial experimental field of the Department of Soil Science, Bangladesh Agricultural University (BAU) farm, Mymensingh. The soil of the plots developed on the alluvial deposit of the Old Brahmaputra. The soil forming processes of the field was mainly influenced by surface water and ground water. There were 10 treatment combinations viz. control, N, NP, NK, NPK, NS, NZn, NSZn, NPKSZn and FYM. The fertilizer doses used for each crop were 90 kg N ha^-1, 20 kg P ha^-1, 19 kg K ha^-1, 30 kg S ha^-1, 8 kg Zn ha^-1 and 5000 kg cowdung ha^-1. Out of these 10 treatments 6 treatments were considered viz. Control, N, NP, NPK, NPKSZn and NFYM. Soil samples at depth of 0-10, 10-20 and 20-30 cm were collected from three spots of three replicated plots of the selected treatments. Soil pH was measured by glass electrode pH meter using soil: water suspension of 1:2.5 as described by Jackson (1962). Organic carbon of the soil samples was determined by wet oxidation method and the organic matter was calculated by multiplying percent organic carbon with the conventional Van Bemmelin factor of 1.73. Total nitrogen of soil was estimated by semi microkjeldahl method. Available phosphorus was extracted from soil by shaking with 0.5 M NaHC0₃ solution at pH 8.5 following the method. The amount of exchangeable potassium extracted from the soil with 1N NH₄OAc solution at pH 7.0 was determined by flame-photometer and, comparing the reading to the standard curve prepared for K. The soil was extracting with CaCl₂ solution (0.15%) and the S in the extract was determined by developing turbidity by adding acid seed solution (20 ppm S as K₂SO₄ in 6N HCI) and BaCl₂ crystals. The intensity of turbidity was measured by Spectrophotometer at 420 nm wave length. The amount was calculated by comparing the colorimetric readings with a standard curve. Analysis of variance of the measured parameters was performed using MSTAT-C and treatment means were compared using Duncan's multiple range test (DMRT) at 5% probability level.

Source of Information: J. Agrofor. Environ. 7 (2): 163-166, 2013; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Due to long continued cultivation of wet land rice, the amount of organic matter and total N increased in soil over initial level. Soil pH decreased in control, N and NP treated plots but remained static in NPK, NPKSZn and NFYM treated plots. The P content of soil increased in P treated plot over control. The available S status increased in soil due to NPKSZn and NFYM treatments. The status of K reduced very strikingly over initial values in all treatments.

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