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Effectiveness of Ronstar 12l - a New Formulation of Herbiside Ronstar 25ec (oxidization) to Control Weeds in Lowland and Irrigated Rice.

A J Mridha
CSO & Head Agronomy Division.
BRRI Gazipur-1701

M A Mazid
Ex. CSO & Head Agronomy Division.

Abstract/ Executive Summary:

A study was conducted to observe the effectiveness of Ronstar 12L, a new formulation of Ronstar 25EC (Oxidization), to control weeds in lowland and irrigated rice. Two experiments were conducted in BRRI farm, Gazipur during T. Aman and Boro, 1993 and 1994, respectively. Four treatments: (i) Ronstar 12L 3 L/ha: (ii) Ronstar 25EC 1 L/ha: (iii) Ronstar 25EC 2 I/ha and; (iv) 2 hand weeding; and (v) Unweeded (control) were laid out in RCB design with four replications. Ronstar 12L controlled weeds effectively during T. Aman 1993 and gave similar grain yield as hand weeding treatment. Similar results were obtained in experiments during Boro 1994. Ronstar 12L also gave comparable plant growth and yield components to hand weeding in both T.Aman and Boro. This chemical had no phytotoxic effect on crops. Ronstar 25EC 1 I/ha was as effective as Ronstar 2 l/ha in controlling weeds Ronstar EC application needs sprayer and it is not readily available. On the other hand, Ronstar 12l can be applied directly to the field from the container which is specially made for this purpose and costs similar to Ronstar EC (1 I/ha) application. Two hand weedings cost Tk 2180.00 and Tk 2240.00 in T. Aman and Boro especially which are considerably more expensive than Ronstar 12L which cost Tk 1250.00 /ha. Hence Ronstar 12L can be used profitably to control weeds in lowland rice.

Keywords: Ronstar 12L, Control weeds, Lowland and Irrigated rice

Location: BRRI Gazipur-1701

Start Date: 02-03-1993

End Date: 09-05-1994

Program Area: Pest Management

Commodity: Herbicide

Objectives:

To observe the effectiveness of Ronstar 12L to control weeds in lowland and irrigated rice.

Methodology:

TA study was conducted to observe the effectiveness of Ronstar 12L, a new formulation of Ronstar 25EC (Oxidization), to control weeds in lowland and irrigated rice. Two experiments were conducted in BRRI farm, Gazipur during T. Aman and Boro, 1993 and 1994, respectively. Four treatments: (i) Ronstar 12L 3 L/ha: (ii) Ronstar 25EC 1 L/ha: (iii) Ronstar 25EC 2 I/ha and; (iv) 2 hand weeding; and (v) Unweeded (control) were laid out in RCB design with four replications. The soil is a silty clay loan with pH between 6-7 and falls in the Madhupur Tract Agro-ecological zone (Chhiata series). During transplants Aman season, the experiment was laid out in August, 1993 and in Boro it was laid out in January.

Source of Information: Bangladesh Rice j. 8(1&2):31-34, 1997

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 30.000/-

Total Budget (Tk.) : 30.000/-

Achievement/Findings:

Ronstar 12l can be applied directly to the field from the container which is specially made for this purpose and costs similar to Ronstar EC (1 I/ha) application. Two hand weedings cost Tk 2180.00 and Tk 2240.00 in T. Aman and Boro especially which are considerably more expensive than Ronstar 12L which cost Tk 1250.00 /ha. Hence Ronstar 12L can be used profitably to control weeds in lowland rice.

Knowledge Management: Journal