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Physiological Parameters of Transplant Aman Rice (cv. BRRI Dhan49) as Influenced by Weeding Regime and Integrated Nutrient Management

S.K. Paul
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

S.M.M. Islam
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

M.A.R. Sarkar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

A. Alam
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

F. Zaman
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

Abstract/ Executive Summary:

The study was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to investigate the effect of weeding regime and integrated nutrient management on physiological parameters of transplant Aman rice (cv. BRRI dhan49). The experiment consisted of five weeding regimes viz. control (no weeding), one weeding at 15 DAT, two weedings at 15 and 30 DAT, three weedings at 15, 30 and 45 DAT and application of herbicide (Manage 10 WP) and five nutrient management viz. BRRI recommended chemical fertilizers, cowdung at 10 t ha^-1, poultry manure at 5 t ha^-1, 50% BRRI recommended chemical fertilizers + cowdung at 5 t ha^-1 and 50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1. The two-factor experiment was laid out in a randomized complete block design with three replications. The effect of weeding regime and integrated nutrient management significantly influenced on leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR) and net assimilation rate (NAR). LAI showed its highest values at all sampling dates in three weedings at 15, 30 and 45 DAT whereas its lowest values were found in no weeding treatment. 50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1 showed the highest values of LAI at all sampling dates and their corresponding lowest values were recorded in cowdung at 10 t ha^-1. During the period 25-40 DAT, the highest CGR, RGR and NAR were found in three weedings at 15, 30 and 45 DAT whereas the lowest one was found in no weeding condition. 50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1 showed the highest values in CGR, RGR and NAR. However, at 40-55 DAT, the highest CGR and the highest NAR was found in three weedings at 15, 30 and 45 DAT followed by two weedings at 15 and 30 DAT and the lowest one was recorded in no weeding condition. The highest RGR was found in two weedings at 15 and 30 DAT within the period 40-55 DAT. However, at 55-70 DAT the highest CGR, RGR and NAR were found in no weeding compared to two and three weedings. At 70-85 DAT, the highest CGR and NAR were found in three weedings whereas the highest RGR was found in one weeding condition. In 25-40 DAT and in the final harvesting date, the highest CGR, RGR and NAR were found in 50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1. At 40-55 and 55-70 DAT, RGR and NAR shows their highest values in cowdung at 10 t ha^-1. The interaction between three weedings with 50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1 showed the highest values of CGR at 25-40 and 70-85 DAT. In case of RGR and NAR most of the highest values were found in the interaction between three weedings with 50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1 in most of the sampling dates.

Keywords: Weeding regime, Integrated nutrient management, Physiological parameters, Transplant Aman rice.

Location: Agronomy Field Laboratory Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 00-06-2013

End Date: 00-12-2013

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1. To analyses physiological parameters viz. leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR), net assimilation rate (NAR) when weeding regimes and integrated nutrient management were considered as treatment. Therefore, this study was undertaken to analyze the growth parameters of late transplant Aman rice (cv. BRRI dhan49).

Methodology:

The experiment was conducted at the Agronomy Field Laboratory Bangladesh Agricultural University (BAU), Mymensingh during the months from June to November, 2013. The experimental site belongs to the Old Brahmaputra floodplain (AEZ-9). The land was medium high with silty loam texture having pH 6.7 and low in organic matter content. The experiment consisted of five weeding regime viz. no weeding (control), one weeding at 15 days after transplanting (DAT), two weedings at 15 and 30 DAT, three weedings at 15, 30 and 45 DAT and application of herbicide (Manage 10 WP , Pyrazosulfuran-ethyl 10%), and five integrated nutrient management viz. BRRI recommended chemical fertilizers (171-83-100-100-10 kg ha^-1 of Urea-TSP-MoP-Gypsum-ZnSO₄, respectively), cowdung at 10 t ha^-1, poultry manure at 5 t ha^-1, 50% BRRI recommended chemical fertilizers + cowdung at 5 t ha^-1 and 50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1. The experiment was carried out in a randomized complete block design with three replications. The land was prepared thoroughly by tilling once with a power tiller and subsequently ploughing three times with country plough followed by laddering. Both organic and inorganic fertilizers were applied according to the experimental treatments. The full dose of triple super phosphate (TSP), muriate of potash (MoP), gypsum, zinc sulphate, cowdung and poultry manure were applied at the time of land preparation. Urea was top dressed in three equal splits at 15, 35 and 55 DAT as per treatments. Experimental plots were irrigated as and when necessary. Weeding was done as per experimental treatments. To determine the leaf area and total dry matter production, destructive sampling of two randomly selected hills excluding boarder rows 1 m × 1 m area. The roots of each plant were removed. Then the plants were washed with tap water and the destructive plant samples were packed in labeled brown paper bags and dried in the oven at 85 ± 5° C for 72 hours until constant weight was reached and their dry weights were recorded. The collected data were compiled and tabulated in proper form and analyzed statistically. Analysis of variance was done following RCBD design with the help of computer package MSTAT and the mean differences among the treatments were adjudged by Duncan's Multiple Range Test. Physiological parameters such as, LAI, CGR, RGR and NAR, were calculated by following standard formulae as: (i) Leaf area index (LAI): Ratio of leaf area to its ground area. LAI = (LA ÷ P), here, LA = leaf area, A= ground area; (ii) Crop growth rate (CGR): Increase of materials per unit of time. CGR = [(1÷ A) × {(W₂ – W₁) ÷ (T₂ – T₁)}] (g hill^-1 day^-1), here, W = dry matter , T = time; (iii) Relative growth rate (RGR): Increase of materials per unit of plant materials per unit of time. RGR = {(LnW₂ – LnW₁) ÷ (T₂ –T₁)} (g day^-1 hill^-1), here, W = dry matter , T = time; (iv) Net assimilation rate (NAR): Increase of plant materials per unit of assimilatory material per unit of time. NAR = [{(W₂-W₁) ÷ (LA₂-LA₁)}× {(LnLA₂-LnLA₁) ÷ (T₂-T₁)}] = [{(W₂-W₁) ÷ (T₂-T₁)} × {(LnLA₂-LnLA₁) ÷ (LA₂-LA₁)}] = [CGR × {(LnLA₂-LnLA₁) ÷ (LA₂-LA₁)}] (g cm^-2 day^-1), here, W = dry matter, LA = leaf area, CGR = crop growth rate.

Source of Information: J. Agrofor. Environ. 8 (2): 121-125, 2014; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1 showed the highest values of LAI at all sampling dates and their corresponding lowest values were recorded in cowdung at 10 t ha^-1. During the period 25-40 DAT, the highest CGR, RGR and NAR were found in three weedings at 15, 30 and 45 DAT whereas the lowest one was found in no weeding condition. 50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1 showed the highest values in CGR, RGR and NAR. However, at 40-55 DAT, the highest CGR and the highest NAR was found in three weedings at 15, 30 and 45 DAT followed by two weedings at 15 and 30 DAT and the lowest one was recorded in no weeding condition. The highest RGR was found in two weedings at 15 and 30 DAT within the period 40-55 DAT. However, at 55-70 DAT the highest CGR, RGR and NAR were found in no weeding compared to two and three weedings. At 70-85 DAT, the highest CGR and NAR were found in three weedings whereas the highest RGR was found in one weeding condition. In 25-40 DAT and in the final harvesting date, the highest CGR, RGR and NAR were found in 50% BRRI recommended chemical fertilizers + poultry manure at 2.5 t ha^-1.

Knowledge Management: Journal