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Comparative Growth Attributes of Echinochloa Colona (l). Link. Grown in Rice Field

Md. Ekram ul Haque
Principal Scientific Officer
Soil Science Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202

Dr. S. M. Rezaul Karim
Professor
Department of Agronomy, BAU, Mymensingh-2202

A. T. M. Samsuddoha
Professor
Department of Soil Science,Sere Bangla Agricultural University, Dhaka

Abstract/ Executive Summary:

A pot experiment was conducted at Bangladesh Agricultural University during the period from may 1993 to September 1993 to see the growth pattern of E.colonum under two densities-28 and 56r m² both in pure stands and in mixtures with aus rice cv. BR21. Experimental results revealed that the maximum loss of dry matter of rice was observed between 3 to 5 weeks after sowing (WAS). The mean leaf area index (LAI), Net assimilation rate (NAR) and crop growth rate (CGR) of weed increased progressively up to 9 WAS both in monoculture and in mixture but the LAI of rice increased up to 16 WAS. The CGR of the weed and rice was found to decrease with the increase in weed density. The Relative Growth Rate (RGR) of the weed and rice was maximum between 3 to 5 WAS, and then it reduced gradually. About 48% of grain yield was reduced due to competition of a single plant of the weed against a single rice plant. The competitive ability of the weed was competitive than the density of 28 weeds/m² than that of 56 weeds/m².

Keywords: weed, Rice, Weed density, Echinochloa Colona

Location: Bangladesh Agricultural University Campus, Mymensingh

Start Date: 19-05-1993

End Date: 25-09-1993

Program Area: Pest Management

Commodity: Infestation

Objectives:

The present investigation was therefore undertaken to-

1. know the changes in plant characters of E.colonum and direct-seeded aus rice at different growth stages in pure stands and mixture,

2. know the different growth indices of the weed and aus rice at different stages of growth in monoculture and in mixture with each other,

3. know the effect of weed densities on plant characters and plant growth rates of weed and rice,

4. know the relationship of plant characters and plant growth rates of crop and weed to the competitive ability of the weed.

Methodology:

Two densities of weed such as two and four plants per pot were maintained with an fixed density of rice (3 rice seedlings/pot). Rice and weed were harvested six and five times, respectively with a 14 days interval. Twenty eight treatments were arranged in a RCBD with three replications. The treatments were (a) Six treatments=rice monoculture x six harvest time, (b) twelve treatments=rice x two weed densities x six harvest time and (c) ten treatments=weed monoculture x two weed densities x five harvest time. BR-21 was taken as test variety. The pots were filled with silty loam soil mixed with cowdung @ 70gm/1kg soil. Plants were destructively sampled from rice monoculture, weed monoculture and mixture of these species. Periodic sampling was done at two weeks interval starting from three weeks after sowing to after final harvest.

Source of Information: Bangladesh J. Bot.28(2): 159-167, 1999 (December)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The maximum loss of dry matter of rice was observed between 3-5 weeks after sowing. The mean LAI, NAR, CGR of weed increased progressively up to 9 WAS both in mono culture and in mixture but the LAI of rice increased up to 16 WAS. The CGR of the weed and rice was found to decrease with the increased in weed density. RGR of the weed and rice was maximum between 3-5 WAS. About 48% of grain yield was reduced due to competition of a single plant of the weed against a single rice plant. The competitive ability of the weed was greater at the density of 28 weeds/m²than that of 56 weeds/m².

Knowledge Management: Journal