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Genotypic Variation in Growth Parameters of Traditional Rice Cultivars Under Nitrogen Limiting Condition

Mian Sayeed Hassan
Crop Division, Bangladesh Agricultural Research Council, Farmgate, Dhaka 1215, Bangladesh

Abul Khair
Department of Botany, Jahangirnagar University, Savar. Dhaka, Bangladesh

M Moynul Haque
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

Abdul Hamid
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Ban gladesh

Abstract/ Executive Summary:

Plants with application of nitrogen (80 kg ha^-1) produced the highest leaf area index (LAI) of 4.23 followed by that of 10 t ha^-1 cowdung (4. 12), whi le zero nitrogen resulted considerably in low LAI (3.70) at 65 days after transplanting (DAT). Traditional cultivar Barud produced the highest LA I (4.90) followed by Basfulchikon (4. 18).Crop growth rate (CGR) with added nitrogen was better, irrespective of traditional cultivars. CGR increased sharply after transplanting and reached at the peak between 55 to 65 DAT. Barud, the long duration traditional cultivar, showed the highest CGR (24.59 g g^-1day^-1). Badiruzzman, Golapi, Malanchi and Barud maintained a higher average CGR value of 1 3.58 to 15.73 g g^-1day^-1 during 1 5 to 85 OAT, whil Basfulchik on was the intermediate (13.41 g g ^-1 day^-1). On the contrary, Laichi, Kamerga chikon and Tulshimala performed in lesser magnitude. The highest total dry matter (TDM) was observed in N (80 kg ha^-l) treatment followed by cowdung treatment, while plant with zero nitrogen produced considerably low TDM at 85 OAT. Barud produced the highest TOM, which was marked ly over rated from 55 DAT and continued up to the end. Laichi and Tulshimala were ranked the lowest for TDM production. All the traditional cultivars showed almost identical trend of TOM over time under variable nutrient levels.

Keywords: Leaf area index, Crop growth rate, Total dry matter

Location: Bangabandhu Sheikh Mujibur Rahm an Agricultural University (BSMRAU) experimental farm

Start Date: 10-06-2003

End Date: 30-12-2003

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To evaluate the extent of genotypic variability in growth parameters and yield levels of traditional cultivars under nitrogen limiting condition.

Methodology:

A field experiment was conducted at the Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU) experimental farm during A man growing season of 2003. Three variable nutrient levels and eight traditional A man rice traditional cultivars formed the treatment variables. The experiment was conducted in split plot design with three replications. The variable nutrient levels that we re assigned in the main plots were i) no added Nitrogen, ii) added Nitrogen @ 80 kgha^-1) and iii) cowdung (10 t ha^-1oven dry basis). Eight diverse rice cultivars that were placed the sub-plots were. V₁) Badiru zzaman , V₂ )- Golapi, V₃)- Laichi, V₄)- Banshful chikon, V₅)- Malanchi, V₆ ) Barud, V₇)- Kamarga chikon and Y8)- Tulshimala. The major soil chemical properties of the experi mental field were as total nitrogen (N)- 0.11%, phosphorous (P)- 2.72 g g^-1 soil, potassium (K ) -0.197 mcq I00 g·l soil, and sulfur (S)- 7.90 micro gg·l soils. Seeds were soaked on 24 July, 2003. The sprouted seeds ·were seeded in a well-managed seedbed. Necessary cares were taken in the seed bed for producing healthy seedlings. A general dose @ 20-40-10 kgha^-1 of P-K-S was applied as basal except cowdung treated plots; where, a well-decomposed cowdung was incorporated in the assigned plots . Thirty one days old seedlings were transplanted in 5 x 3m plot with a spacing of 25 x 15 em on 28th August, 2002. Nitrogen in the form of urea was top-dressed at 15, 35 and 55 days after transplanting (DAT). The experimental plots were kept clean b) hand weeding until flowering. Insect infestation was controlled by spraying Dimacrone while laniral were placed in plots for minimize the rat attack during ripening stage. The crop was raised with supplemental irrigation as and necessary and proper drainage was maintained in case of over water due to heavy shower. Other intercultural operations were done as and when necessary.

Source of Information: Ann. Bangladesh Agric. (2009) 13 (I & 2): 7-15

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The highest total dry matter (TDM) was observed in N (80 kg ha-l) treatment followed by cowdung treatment, while plant with zero nitrogen produced considerably low TDM at 85 DAT. Barud produced the highest TOM, which was marked ly over rated from 55 DAT and continued up to the end. Laichi and Tulshimala were ranked the lowest for TDM production. All the traditional cultivars showed almost identical trend of TOM over time under variable nutrient levels.

Knowledge Management: Journal