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Effect of Herbicide Prechlor on the Performance of T. Aman Rice

Dr. M. A. Salam
Professor
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202Bangladesh

Abstract/ Executive Summary:

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh during the period from July to December 2012 to find out the effect of herbicide Prechlor 500 EC on weed control and performance of transplant aman rice. The experiment was laid out in a randomized complete block design with four replications. The experiment consisted of two varieties viz., BRRI dhan41 and Nizershail, and four levels of Prechlor @ 0, 0.5, 1.0 and 1.5 L ha^-1. Monochoria vaginalis, Nymphaea nouchali, Paspalum scrobiculatum, Echinochloa crusgalli and Scirpus juncodies were the major weeds in the experimental plots. Prechlor 500EC @ 1.5 L ha^-1showed the best performance in reducing weed density, weed dry weight and increased weed control efficiency but reduce grain yield. Variety had significant influence on all the yield and yield contributing characters of rice. Higher grain yield (3.09 t ha^-1) was obtained from BRRI dhan41. Different levels of Prechlor also had significant effect on yield and yield contributing characters such as number of total tillers hill^-1, number of effective tillers hill^-1, panicle length, spikelets panicle^-1, grains panicle^-1, grain yield, straw yield and harvest index. Prechlor @ 1.5 L ha^-1 showed best performance with respect to most yield attributes, grain and straw yields and the lowest grain yield was obtained from Prechlor @ 0 L ha^-1. The interaction effects of variety and herbicide Prechlor had significant effect on all yield attributes except plant height, effective tillers hill^-1, panicle length, 1000-grain weight and harvest index. The highest grain yield (3.62 t ha^-1) was obtained from variety BRRI dhan41 with Prechlor @ 1.5 L ha^-1.

Keywords: Herbbicide, Prechlor, T. Aman rice, Performance

Location: Mymensingh

Start Date: 00-07-2012

End Date: 00-12-2012

Program Area: Pest Management

Commodity: Herbicide

Objectives:

To find out the effect of herbicide Prechlor 500 EC on weed control and performance of transplanted aman rice.

Methodology:

The study was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh during the period from July to December 2012. The experimental treatment consisted of two factors. They are cultivar: 2- BRRI dhan41 (V₁) and Nizershail (V₂); herbicidal treatments: 4-No weeding (T₁), Prechlor 500 EC@ 0.5L ha^-1(T₂), Prechlor 500 EC @ 1.0L ha^-1(T₃) (recommended dose), Prechlor 500 EC @ 1.5L ha^-1(T₄). Prechlor was applied 5 days after transplanting (DAT) by knapsack sprayer in presence of 4-5 cm standing water in the plots. Weeds were allowed to grow from transplanting to harvesting in all the no weeding plots without any disturbance. The experiment was laid out in a randomized complete block design with four replications. Treatment combinations were assigned at random in block. Each plot size was 4.0 m × 2.5 m (10 m²). The distance between the blocks was 1 m and the spacing between the unit plots was o.5 m. The experimental plots were fertilized with urea, triple super phosphate, muriate of potash, gypsum and zinc sulphate @ 180, 100, 70, 60, 10 kg ha^-1, respectively in case of BRRI dhan41 and 90, 50, 35, 30, 5 kg ha^-1 , respectively in case of Nizersail. All the fertilizers expect urea were applied at the time of final land preparation. Urea was top dressed in three equal splits at 15, 30 and 45 days after transplanting (DAT). Thirty-day-old seedlings were transplanted in the unit plots on 23 July 2012 at the rate of three seedling hill^-1 maintaining a spacing of 25 cm from row to row and 15 cm from hill to hill. The crop of each plot was harvested from 1m² (1m × 1m) of the central area with sickle at full maturity. Transplanted plots of BRRI dhan41 were harvested on 5 December 2012 and Nizershail were harvested on 17 December 2012. Just prior to harvesting five hills excluding the border plants and the harvest area of each plot were selected at random and uprooted for collecting data on yield components. The grain and straw weight for 1m²areas were recorded after proper sun drying and then converted into t ha^-1 at 14% moisture content. Data were collected on weed density and weed dry weight and plant height, total tillers hill^-1, effective tillers hill^-1, non-effective tillers hill^-1, panicle length, grains panicle^-1, sterile spikelets panicle^-1, 1000-grain weight, grain yield, straw yield and harvest index. Data on weed density were collected from each plot at vegetative growth stage of the rice plants by using 0.5 m × 0.5 m quadrate as per method described by Cruz et al. (1986). The quadrate was placed in three spots at random outside 1m²central areas, kept for taking yield data. The weeds within the quadrate were counted species-wise and converted to number m^-2multiplying by four. After counting the weed density, the weeds inside each quadrate were uprooted, cleaned, separated species-wise and dried first in the sun and then in an electrical oven for 72 hours at a temperature of 80°C. The dry weight of each species was taken by an electrical balance and expressed in g m^-2. Weed control efficiency (WCE) was calculated using the following formula developed by Sawant and Jadhav (1985). Where, WCE = Weed control efficiency, DWC = Dry weight of weeds in the weedy check, DWT = Dry weight of weeds in the weeding treatment. The collected data were analyzed statistically following the ANOVA technique and the mean differences were adjudged by Duncans Multiple Range Test (Gomez and Gomez, 1984) using a statistical computer package program MSTAT-C.

Source of Information: J. Bangladesh Agril. Univ. 11(2): 257–264, 2013 ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest grain yield (3.62 t ha^-1) was obtained from variety BRRI dhan41 with Prechlor @ 1.5 L ha^-1. The results suggest that farmers can be advised to use herbicide Prechlor @ 1.5 L ha^-1 to boost up the production of BRRI dhan41 controlling weeds during aman season under the agro-climatic condition of the study area.

Knowledge Management: Journal