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Determination of Critical Period for Weed Control (cpwc) of Deshi Jute for Fibre at Medium High Land in Comilla Region.

M. M. Hossain
Fibre Quality Improvement Division, BJRI.

M. T. Hossain
Fibre Quality Improvement Division, BJRI.

O. Ahmed
Fibre Quality Improvement Division, BJRI.

Abstract/ Executive Summary:

An experiment was conducted last two years at jute research regional station Chandina, Comilla to determine the critical period of weed control in deshi jute (Corchorus capsularis) fibre crop. Two sets of treatments consisted of two different periods of weed interference viz. a critical weed period and a critical time of weed removal were used. The Gompertz and Logistic equations were fitted to relative yields representing the critical weed free and the critical time of weed removal, respectively. Accumulated thermal units were used to describe each period of weed free and weed removal. The critical weed free period and the critical time of weed removal ranged from 304 to 440 (18 to 25 DAE) and 204 to 285 (11 to 15 DAE) accumulated thermal units respectively.

Keywords: Critical period, Weed contro, Deshi jute, Medium high land

Location:

Start Date:

End Date:

Program Area: Pest Management

Commodity: Jute

Objectives:

To determine the CPWC for deshi jute fiber crop in the medium high land of Comilla region.

Methodology:

Popularly cultivated deshi jute variety CVL-1 was used as planting material and sown at first April and harvest at 20 July in each year. The experiment were designed RCBD with four replications. Two sets of treatments consisted of two different periods of weed interference viz. a critical weed period and a critical time of weed removal were used. Daily mean temperature was recorded for accumulated thermal unit. In the first series, treatments of increasing duration of weed control were maintained weed free until 10, 20, 30, 40, 50 and 60 days after crop emergence (DAE). The weeds were subsequently allowed to develop until final harvest (110 days). In the other series, weed interference treatments of varying duration allowed weeds to compete with from crop emergence until 10, 20, 30, 40, 50 and 60 days; then the plots were weeded and kept weed-free until harvest (110 days). Control plots were kept free of weeds or left weedy throughout the growth period . Weeds were removed manually by hand pulling. Weed harvests were taken at the time of weed removal for treatments where weeds were allowed to grow for different periods after crop emergence and at the time of the final harvest in the case of treatments kept weed free for different periods after crop emergence. At each 10 day period, the accumulated thermal units (ATU) were calculated according to the formula:

Source of Information: Annual Research Report, BJRI,2013-2014,P-213-215

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Critical weed free period starts 17 -18 DAE at 2.5 % predetermined yield loss level and exist up to 25-26 DAE at 10 % expected yield loss level. It indicates that deshi jute crop must keep free from weed before 11 DAE (204 ATU) and up to 26 DAE (467 ATU) to prevent from unavoidable yield loss. However, the critical time of weed removal ranged from 304 to 440 accumulated thermal units at 18 to 25 DAE. Weed biomass proved to be inverse to the fiber and stick yield for both years studied. When weeds competed with the crop from emergence, a large increase in weed biomass was achieved 10 days after crop emergence.

Knowledge Management: Report/Proceedings