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Weed Infestation and Yield Performance of Boro Rice in Direct Seeding Method as Influenced by Green Growth Regulator and Herbicides

H. P. Roy
MS student
Department of Crop Botany, Bangladesh Agricultural University, Mymensing

M. A. Salam
Chief Scientific Officer
Department of Agronomy, BINA, Mymensing

M. R. Islam
Regional Agricultural Research Station, BARI, Ishurdi, Pabna

K. U. Aahammed
Regional Agricultural Research Station, BARI, Ishurdi, Pabna

B. Akhter
Regional Agricultural Research Station, BARI, Ishurdi, Pabna

K. M. Khalequzzaman
Regional Agricultural Research Station, BARI, Ishurdi, Pabna

Abstract/ Executive Summary:

An experiment was carried out at the experimental field of Bangladesh Institute of Nuclear Agriculture, Mymensingh, during February to May 2005 to investigate the effect of green growth regulator (GGR-6) and herbicides on weed infestation and yield performance of Boro rice (cv. Iratom-24) in direct seeding method. The concentration of GGR-6 was 0 (control) and 30 ppm of aqueous solution. The herbicides were Machete 5G and Ronstar 25 EC at the rate of 25 kg ha^-1 and 2 litre ha^-1 respectively. The green growth regulator and herbicides had positive effect on weed infestation and yield performance. GGR-6 at 30 ppm and Machete 5G under direct seeding with plant spacing 25 cm x 20 cm was the best for total number weeds per m^-2, number of effective tillers hill^-1, number of filled grains panicle^-1 and 1000-grain weight were non-significant. The highest grain growth rate was found from direct seeding with plant spacing 25 cm x 20 cm and GGR-6 at 30 ppm. Interaction effect on direct seeding method, herbicides and GGR-6 on grain growth was non-significant. GGR-6 at 30 ppm and Machete 5G under direct seeding method with plant spacing 20 cm x 20 cm possessed better yield contributing characters resulted in the highest grain yield (5.87 t ha^-1). GGR-6 at 30 ppm and Machete 5G under direct seeding with plant spacing 25 cm x 20 cm possessed the 2nd highest grain yield (5.41 t ha^-1). The broadcasting of seeds produced the least yield (2.30 t ha^-1) in all treatments. So it may be suggested that for enhancing yield of direct seeding method with plant spacing 20 cm x 20 cm, GGR-6 at 30 ppm and Machete 5G at the rate of 25 kg ha^-1 would be recommended in rice.

Keywords: Weed infestation, Growth regulator, Herbicide, Rice

Location: The experimental field of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh

Start Date: 00-02-2005

End Date: 00-05-2005

Program Area: Pest Management

Commodity: Chemical weed management

Objectives:

Objective of the study was to study the effect of herbicides and green growth regulators on the weed infestation and yield performance of Boro rice in direct-seeding methods in Bangladesh.

Methodology:

The experiment was conducted at the experimental field of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh, during February to May 2005. The experiment was laid out in three factorial split–split plot design with three replications. Five different treatments were T₁ =direct seeding with 15 cm x 20 cm spacing, T₂ = direct seeding with 20 cm x 20 cm spacing, T₃ = direct seeding with 25 cm x 20 cm spacing, T₄= broadcasting with a seed rate 80 kg ha^-1 and T₅ = transplanting with 15 cm x 20 cm spacing. The size of the main plot was 17 m x 4 m. The sub plot size was 3 m x 4 m. Distance among the sub plot 0.5m, the sub-sub size 3 m x 1.75 m and the distance between sub-sub plots 0.5 m. For the preparation of solution of GGR-6, 0.1g powder was completely dissolved in one litre of distilled water. This solution gave the concentration of 100 ppm. From this 100 ppm solution, required concentration of GGR-6 i.e., 30 ppm was prepared by further diluting. Spraying was done in the direct seeding and transplanted crops at 35 days after sowing (DAS) and 42 DAS at noon using a hand sprayer. Herbicide (Ronstar 25 EC and Machete 5 G) were sprayed at 4 days after sowing and transplanting in presence of 3-5 cm standing water in the plots. Machete 5 G were mixed with sand and applied in the field. Ronstar 25EC was dissolved in water and sprayed in the experimental field. The fertilizers urea, TSP, MP and gypsum were applied @ 150, 100, 70 and 60 kg ha^-1respectively. At the time of the final land preparation full doses of TSP, MP and gypsum were applied. Urea was applied in three equal splits at 10, 30, 45 days after planting respectively. No weeding or stirring of soil was done after the application of herbicides. Irrigation was done from time to time in order to provide condition for proper growth and development of the crop. Seeds were soaked in water for 24 hours. The soaked seeds were then incubated in a warm and shady place for 72 hours for sprouting. After sprouting, the seeds were broadcast by hand in the well puddled plot (in case of direct seeded crop) as well as in the nursery bed (for transplanted crop) at the rate of 80 kg ha^-1. Sprouting seeds were sown by hand with spacing 15 cm x 20 cm, 20 cm x 20 cm and 25 cm x 20 cm, respectively on 14 February 2005. Transplanting was done with 20 days old seedlings on the puddled field after land preparation on 5th March 2005. Three seedlings hill^-1were used with a spacing of 15 cm x 20 cm. Weed vegetation in Boro rice were Panikochu, Angta, Khudey shama, Bara shama, Joina, Nackphul, Holdemutha , Chachra, Durba. The experimental crop was harvested plot wise at maturity. Data on weed infestation, total number of weeds m^-2, weeds weight m^-2, Number of effective tillers hill^-1, 1000-grain weight (g), grain yield t ha^-1 were collected and statistically analyzed to compare by Duncan’s Multiple Rang Test.

Source of Information: Int. J. Sustain. Crop Prod. 4(1):83-90, 2009

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded that, interaction effect between direct seeding methods, herbicides and plant growth regulator was significant for almost all plant growth characters except plant height, number of total tillers hill^-1at 60 DAS. The result showed that the direct seeding with plant spacing 25 cm x 20 cm along with Machete 5G and concentration of GGR-6 at 30 ppm gave the highest values in respect of growth parameter and grain yield.

Knowledge Management: Journal