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Residual Effect of Phosphatic and Potassic Fertilizers on Nutrient Content of Rice

W. Yesmin
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202

M. S. Ali
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202

K. M. Mohiuddin
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202

A. K. M. T. Ahmed
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

A pot culture experiment was conducted in the net house of the Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh with a test crop Aus rice (cv. BR21) was used to find out the residual effects of phosphatic and potassic fertilizer (P and K) in soils of five Agro-Ecological Zones (AEZs) on nutrient contents of rice. The five AEZs namely were Tista Meander Floodplain (AEZ-3), Old Brahmaputra Floodplain (AEZ-9), Old Meghna Estuarine Floodplain (AEZ-19), Eastern Surma-Kushiyara Floodplain (AEZ-20) and Chittagong Coastal Plain (AEZ-23). Two levels of fertilizer were without fertilizer and fertilizer applied in previous crop (wheat). The experiment was laid out in a Completely Randomized Design (CRD) with three replications. The soil samples were collected from each AEZ up to 0-15 cm and 15-30 cm depths. Significant residual effect of P and K in soil was observed on chemical composition of rice grain and straw viz. total nitrogen, phosphorus, potassium, calcium, magnesium and sulphur content. Phosphorus and potassium contents were lower in post harvest soil than pre harvest soil with no fertilizer at both the depth. The highest concentration of N & Mg, P & S, K & Ca in rice straw were found in AEZ-3, AEZ-19 and AEZ-25 respectively, at both 0-15cm and 15-30cm depths and the lowest concentration of P, K & S in rice straw were observed in AEZ-9 at both depths.

Keywords: Rice, Residual effect, Phosphatic and Potassic Fertilizers

Location: Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh

Start Date: 00-01-2007

End Date: 00-05-2007

Program Area: Quality and Nutrition

Commodity: Rice

Objectives:

1. To finding out the residual effect of TSP, MP under renewed application of urea on nutrient content of rice and chemical properties of pre and post harvest soils of five Agro-Ecological zones (AEZ) of Bangladesh.

Methodology:

A pot culture experiment with test crop rice (cv. BR21) was conducted in a net house at the Department of Agricultural Chemistry, Bangladesh Agricultural University, during kharif season in order to evaluate the residual effects of fertilizers applied earlier in the soils of five AEZs of Bangladesh. Amoung 30 Agro-Ecological Zones (AEZ) of Bangladesh only five AEZ was randomly selected. The soil samples were collected from 150 sampling sites up to 0-15 cm and 15-30 cm depths under the upazila of Bogra Sadar, Bogra; Fulpur, Mymensingh; Comilla Sadar, Comilla; Sylhet Sadar, Sylhet and Sitakundu, Chittagong district under the respective five selected AZEs of Bangladesh. Symbolic representation of various soils used in this study along with different treatments at 0-15 com and 15-30 cm depth with residual fertilizer * F₀ – Without fertilizer * F₁ – Fertilizer applied in previous crop (wheat) (Urea 0.266 g. TSP 0.18 g, MP 0.13 g per pot with 5 kg soil). Aus rice cv. BR21 was considered as a test crop for the experiment. The experiment was conducted in pots with a surface area of 707 cm². Each pot contained 5 kg sun dried soil. Experiment was conducted without fertilizer. In previous crops for experimental purposes two rates of fertilizer were applied in each pot. Urea 120 kg, TSP 80 kg, MP 60 kg per hectare basis with a control. The basal dose of urea was applied in three installments. The experiment was laid out in a Completely Randomized Design (CRD) with three replications. Straw samples were extracted and analyzed for N, P, K, Ca, Mg and S following the standard methods of analysis. Soil pH was determined by glass electrode pH meter method. The electrical conductivity of collected soil samples were determined following the procedure outlined by Anderson Ingram. Cation exchange capacity of each soil samples was determined by ammonium acetate saturation method. Available phosphorus in soil was determined by Olsen’s method. Potassium of soil samples were determined with the help of flame photometer. All the collected data were analyzed statistically and the mean differences were adjudged Duncan’s New Multiple Range Test.

Source of Information: J. Agrofor. Environ. 2(1): 1-6, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Significant residual effect of P and K in soil was observed on chemical composition of rice grain and straw viz. total nitrogen, phosphorus, potassium, calcium, magnesium and sulphur content. Phosphorus and potassium contents were lower in post harvest soil than pre harvest soil with no fertilizer at both the depth. The highest concentration of N & Mg, P & S, K & Ca in rice straw were found in AEZ-3, AEZ-19 and AEZ-25 respectively, at both 0-15cm and 15-30cm depths and the lowest concentration of P, K & S in rice straw were observed in AEZ-9 at both depths.

Knowledge Management: Journal