Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Water Management and Herbicide Interaction for Weed Control of Wet Seeded Rice (wsr) in Irrigated Ecosystem-2002

Shahana Parveen
Senior Scientific Officer
IWM Division, BRRI

Dr M A Sattar
CSO and Head
IWM Division, BBRI,Gazipur

Abstract/ Executive Summary:

A field study was conducted at BRRI farm Gazipur to find out the water requirement of WSR, effectiveness of herbicide and economic benefit of herbicide. The study indicates that the higher yield was obtained from broadcasting (5.12t/ha) followed by line sowing (5.06t/ha). Irrigation treatment T₁ gave higher yield (5.21 t/ha). No herbicide use but 3 hand weeding done gave higher yield. In interaction effect the highest yield was obtained from combination of line sowing, no herbicide use but 3 hand weeding and 3 days after disappearing of standing water. Weed infestation was lower in herbicide use before sowing. Also BCR was higher in herbicide use before sowing.

Keywords: Water management, Herbicide, Weed control, Wet seeded rice, Irrigated ecosystem

Location: BRRI farm Gazipur

Start Date: 15-12-2001

End Date: 29-04-2002

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine the amount of water required for WSR cultivation;
To determine the effectiveness of herbicide under different soil moisture regimes; and
To analyze the economics of herbicide use in wet seeded rice.

Methodology:

The study was conducted at BRRI farm Gazipur. There were two water treatments, three herbicide treatments and two sowing methods. The experiment was split-split plot design with three replications of which, main plot was water treatments, sub plot was sowing method and sub-sub plot was herbicide treatments. Treatments were- a. Water treatments: I₁= 5-7 cm irrigation water applied 3 days after disappearing of standing water: I₂= 5-7 cm irrigation water applied 5 days after disappearing of standing water. b. Sowing method: S₁= Line sowing with 20 cm spacing; S₂= Broadcasting. c. Weeding method: W₁= Herbicide use during final land preparation but before sowing, W₂= Herbicide use 6 days after sowing and W₃= Hand weeding. Plot size was 4m x 2.5m. The variety was BRRI dhan28. Sprouted seed was sown. Seed rate was 70 kg/ha. Fertilizer rate was 220-120-85-60-10 kg/ha urea, TSP, MP, Gypsum and ZnSO₄_, respectively. All fertilizer except urea was applied during land preparation. Urea was top dressed in 4 equal splits at an interval of 20-25-30-15 days consecutively. Hand weeding was done 25, 50 and 75 days after sowing. Cidial 5G was applied for insect control on 19 March 2002.

Source of Information: BRRI Annual Internal Review 2002

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Water productivity (5.88 kg/ha mm) was higher in 3 days after disappearing of standing water along with line sowing and hand weeding (I₁S₁W₃). 3 days after disappearing of standing water gave better performance (88.63%WUE) compared to 5 days after disappearing of standing water) (81%). Grain yield and yield attributes of wet seeded rice were not significantly influenced by effect of irrigation treatment. Significant differences were observed among the different weeding methods in terms of plant height; tiller/m² and grain yield. Similar result was found from herbicide application before sowing (W₂). Yield and yield contributing characters of Wet Seeded Rice were significantly influenced by the interaction effect of irrigation, sowing method and weeding method, except 1000 grain weight. Highest plant height (84.93 cm) was observed from 5 days after disappearing of standing water along with broad cast sowing and herbicide application after sowing (1₂S₂W₂). Significantly, the highest grain yield of wet seeded rice (5.67 t/ha) was recorded from 3 days after disappearing of standing water along with line sowing and hand weeding which was identical with the yield (5.35 t/ha) of 3 days after disappearing of standing water along with broadcast sowing and hand weeding.

The highest net return of Tk 7536/ha was obtained from 3 days after disappearing of standing water along with line sowing and hand weeding (I₁S₁W₃) followed by a net return of Tk. 6127/ha from 3 days after disappearing of standing water along with broadcasting and hand weeding method (I₁S₂W₃). The maximum benefit cost ratio of 1.26 was obtained from 3 days after disappearing of standing water along with line sowing and hand weeding method (I₁S₁W₃).

Knowledge Management: Report/Proceedings