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Sensitivity of Annual Weeds Against Sulfentrazone 48 Sc Herbicide in Rice Cultivation

M K A Bhuiyan
Agronomy Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

M M Mahbub
Agronomy Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

Z I Baki
Agronomy Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

L Nahar
Agronomy Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

Abstract/ Executive Summary:

Herbicides are used successfully for weed control in rice fields for rapid effect, easier to application and low cost involvement in comparison to the traditional methods of hand weeding. Sulfentrazoneis a new pre-planting herbicide in Bangladesh. Field trials were conducted at Bangladesh Rice Research Institute (BRRI), Gazipur during Aman 2014 and Boro 2014-15 to evaluate the efficacy of Sulfentrazone 48 SC on weed suppression and performance of transplanted rice. Treatments were Sulfentrazone 48 SC @ 150, 200 and 250 ml ha^-1, pretilachlor 500 EC @ 1000 ml ha^-1, weed free and unweeded control. Visual assessment indicated that this herbicide possesses high selectivity and not toxic to rice plants. The results revealed that the major weed flora associated with the transplanted rice was mainly comprised of two grasses, two sedges and four broad leaves in Aman 2014 and two grasses, two sedge and two broad leaves in Boro 2014-15. The most dominant weeds were Cyperus difformis, Echinochloa crus-galli, Scirpus maritimus and Monochoria vaginalis in both the growing seasons. Application of Sulfentrazone 48 SC @ 200 ml ha^-1 was most effective to suppress weed density and dry masses in both the seasons resulting increased grain yield more than 50% as compared to unweeded control. Therefore, Sulfentrazone 48 SC @ 200 ml ha^-1 should apply two or three days before planting for effectively control weeds in rice.

Keywords: Sulfentrazone, Transplanted rice, Weed density, Weed control efficiency

Location: Bangladesh Rice Research Institute, Gazipur, Bangladesh

Start Date: 00-07-2014

End Date: 00-06-2015

Program Area: Pest Management

Commodity: Herbicide

Objectives:

To study the Sensitivity of Annual Weeds against Sulfentrazone 48 SC herbicide in Rice Cultivation

Methodology:

The experiment was conducted at Bangladesh Rice Research Institute, Gazipur, situated at 23°59´33´´ N and 90°24´19´´ E at an elevation of 8.4 m from the mean sea level, and is characterized by sub-tropical climate during Aman 2014 and Boro 2014-2015 seasons to evaluate the efficacy of sulfentrazone for weed suppression and to find out an appropriate dose of this herbicide and its impacts on transplanted rice. The commercial name of sulfentrazone is Authority 48 SC. The soil of the experimental field was non-calcareous dark grey flood plain (FAO, 2004) with pH around 6.2 and low in organic matter (1.2%). The experiment was carried out with six treatments. All treatments were laid out in a randomized complete block design with three replications. Twenty-five- day-old seedlings of BRRI dhan49 for T. Aman 2014 and 35-day-old seedlings of BRRI dhan28 for Boro 2014-2015 were transplanted. Two/three seedlings per hill were transplanted maintaining 20 × 20 cm spacing. The field was fertilized following BRRI recommendation (T. Aman: N:P:K:S= 69:10:41:11 kg ha^-1 and Boro; N:P:K:S= 120:19:60:24 kg ha^-1) (BRRI, 2013). Herbicides were sprayed three days before transplanting with the help of a knapsack sprayer. In weed free treatment, the plots were kept weed free up to 45 DAT by hand weeding and check herbicide was Pretilachlor (commercial name is Rifit 500 EC). Authority 48 SC (Sulfentrazone) herbicide is new in Bangladesh and its phytotoxicity needs to be evaluated on rice crop. The phytotoxicity of the herbicide on rice plants was determined by visual observations (yellowing leaves, burring leaf tips, stunting growth etc). Analysis of Variance of the measured parameters were analyzed and graphical presentation were done by using STAR 2.0.1 software.

Source of Information: Bangladesh Rice J. 21 (1) : 67-76, 2017

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Grain yield and yield attributing parameters and weed dynamics were greatly influenced by different weed management practices. Authority 48 SC @ 250 ml ha^-1 performed better weed control efficiency with slightly phytotoxity. Depending on the weeding efficacy, Authority 48 SC @ 200 ml ha^-1 applied at three days before transplanting is effective for annual weed control option instead of hand weeding at peak period of labour crisis which can reduce the production cost.

Knowledge Management: Journal