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Growth and Yield of Deepwater Rice as Affected by Leaf Pruning

A R Gomosta
Principal Scientific Officer
Bangladesh Rice Research Institute, Habiganj Regional Station

A H Khan
Scientific Officer
Bangladesh Rice Research Institute, Habiganj Regional Station

M S Ali
Scientific Officer
Bangladesh Rice Research Institute, Habiganj Regional Station

Abstract/ Executive Summary:

Green leaves of HAIV, at traditional deepwater (DW) rice variety, and BR224-2B-2-5, a promising deepwater rice breeding line, were pruned at 94 days after seeding (DAS). All leaves except the topmost growing one of a particular stem were pruned at the collar at an interval of 30 days. Both leaf area expansion as well as increment of stem dry weight progressed in a zig-zag pattern when leaves were pruned at different times. The severe drop followed by rapid increase in relative growth rate of pruned plants was possibly due to very small leaf area resulting in negative assimilation rate at leaf pruning followed by rapid leaf area expansion. Leaf pruning for the third time resulted decrease in yielding ability of the rice varieties. Leaf pruning for two times, however, decreased grain yeild of BR224-2B-2-5 but increased grain yield of HAIV.

Keywords: Growth, Yield, Deepwater rice, Leaf pruning

Location: BRRI regional station, Habiganj

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To observe the growth behaviour as well as yielding ability as affected by leaf cutting in DW rice.

Methodology:

The experiment was conducted at the BRRI regional station, Habiganj under field conditions. Seeds of BR224-2 B-2-5, a promising deepwater rice breeding line, and Habiganj Aman (HAIV ), a traditional deepwater rice variety, were dibbled at 20- x 10-cm spacing. Seedlings at each hill were thinned to 2-4 at 30 day after seeding (DAS). At 94 DAS when the field was inundated by 72 cm water, leaves above water were pruned except the control plots. All leaves except the topmost growing one of a particular stem were pruned at the collar. The leaves were pruned at an interval of 30 days. A combination of variety and leaf pruning treatment was arranged in RCB design with three replications. The change in stem dry weight is expressed as relative growth rate (RGR).

Source of Information: Bangladesh Rice J. 5(1 &2): 21-26, 1994

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Considering yield and yield components, double cut of the green leaves, 30 days before panicle initiation can be operated to obtain around 1 ton of herbage without sacrificing grain yield of HAIV.

Knowledge Management: Journal