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Effects of Integrated Weed Management Practices on the Performance of Boro Rice Cultivars

Sadia Tasmin
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

Md. Abdus Salam
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

Md. Delwar Hossain
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

An experiment was conducted during the period from November 2016 through May 2017 to evaluate the effect of integrated weed management practices on weed suppression and on the performance of boro rice cultivars. The experiment consisted of two cultivars viz., BRRI dhan28 and BRRI dhan29 along with eight different weed management practices. Cultivar did not exert any significant effect on weed density and dry weight. Integrated weed management practices exerted significant effect on weed density and dry weight. The highest weed dry weight was observed in no weeding treatment and lowest one was recorded in application of pre-emergence herbicide followed by one hand weeding at 35 DAT. BRRI dhan28 × no weeding treatment produced the highest weed dry weight and BRRI dhan28 × application of pre-emergence herbicide followed by one HW produced the lowest weed dry weight at different DATs. BRRI dhan28 produced higher grain and straw yields than BRRI dhan29. The highest grain yield was obtained from application of pre-emergence herbicide followed by one hand weeding at 35 DAT. BRRI dhan28 × application of pre-emergence herbicide followed by one HW at 35 DAT produced the highest grain yield and the lowest grain yield was resulted from BRRI dhan28 × no weeding treatment. From the study it may be concluded that BRRI dhan28 × application of pre-emergence herbicide followed by one HW at 35 DAT may be recommended for controlling weeds effectively and for getting the highest grain yield in boro rice.

Keywords: Boro rice, Herbicide, Integrated weed management, Rice yield, Weed suppression

Location: Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh

Start Date: 00-11-2016

End Date: 00-05-2017

Program Area: Crop-Soil-Water Management

Commodity: Weed management, Rice

Objectives:

1. To find out the effect of different weed management techniques on the weed suppression and yield of boro rice,

2. To assess the effect of interaction between cultivar and integrated weed management practices on weed suppression and the yield performance of boro rice.

Methodology:

Two boro rice cultivars BRRI dhan28 and BRRI dhan29 were used as experimental materials. The experiment was carried out at the Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh during the period from November 2016 through May 2017 to study the effect of integrated weed management practices on the performance of Boro rice. The experimental area is characterized by non-calcareous dark grey floodplain soil belonging to the Sonatola soil series under the old Brahmaputra Floodplain Agro-ecological zone 9. The soil of the experimental field was more or less neutral with pH value 6.8, low in organic matter content and fertility status is also low. The land type was medium high with silt loam in texture. The climate of the locality is tropical in nature and is characterized by high temperature and heavy rainfall during kharif season (April to September). The experimental treatments were as follows: Factor A: Variety (2), BRRI dhan28 (V₁), BRRI dhan29 (V₂), Factor B: Integrated weed management practices (8), No weeding (W₀), Application of pre-emergence herbicide Pretilachlor @ 2L ha^-1 (W₁), Application of early post-emergence herbicide Pediplus (Acetachlor + Bensul-furon methyl (W₂), Application of pre-emergence herbicide followed by early post-emergence herbicide (W₃), Application of pre-emergence herbicide followed by one hand weeding at 35 DAT (W₄), Application of early post-emergence herbicide followed by one hand weeding at 35 DAT (W₅), Stale seedbed (W₆), Stale seedbed followed by application of early post emergence herbicide (W₇). The experiment was laid out in a randomized complete block design with three replications. There were 16 treatment combinations. Total number of unit plots was 48. Seeds of rice variety BRRI dhan28 and BRRI dhan29 were collected from the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh. The sprouted seeds were sown in the nursery bed on 18 November 2016. The experimental plots were fertilized with urea, triple superphosphate, muriate of potash, gypsum and zinc sulphate @ 300-100-150- 110-10 kg ha^-1, respectively (BRRI, 2018). The entire amounts of triple superphosphate, gypsum, zinc sulphate and two thirds of muriate of potash were applied at the time of final land preparation. Urea was applied in three installments at 15, 35 and 60 days after transplanting. Rest one third muriate of potash was applied with third dose of urea. Seedlings were transplanted in the well prepared puddle field on 28 December 2016 at the rate of two seedlings hill^-1, maintained row and hill distance of 25 cm and 15 cm in conventional method. In case of stale seedbed, seedlings were transplanted in the plot on 7 January 2017. The crop of each plot was harvested from 1 m² of the central area with sickle at full maturity. Just before 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. BRRI dhan28 was harvested on 29 April and BRRI dhan29 on 7 May 2017. Then the harvested crops of each plot was bundled separately, properly tagged and brought to threshing floor. The crops were then threshed and dry weight of grain and straw were recorded. The data of weed parameters were collected at 25 DAT, 50 DAT and 75 DAT of rice plants. Weed parameters such as weed density (no. m^-2) and weed dry weight (g m^-2) were collected. Crop characters such as plant height (cm), number of total tillers hill^-1, number of effective tillers hill^-1, tillers hill^-1, panicle length, number of grains panicle^-1, number of sterile spikelets panicle^-1, 1000grain weight, grain yield, straw yield and harvest index were recorded. All the recorded data were compiled and tabulated for statistical analysis. The collected data were analyzed following the analysis of variance (ANOVA) technique and mean differences were adjusted by Duncan's Multiple Range Test (DMRT) (Gomez and Gomez, 1984) using a computer operated program namely, MSTAT-C.

Source of Information: Archives of Agriculture and Environmental Science 4(3): 273-280 (2019)

Article Link (Online Journal): https://doi.org/10.26832/24566632.2019.040303

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Although cultivar did not exert any significant effect on weed density and dry weight but integrated weed management practices had significant effect on weed density and dry weight. BRRI dhan28 produced higher grain and straw yields than BRRI dhan29. The highest grain yield was obtained from the application of pre-emergence herbicide followed by one hand weeding at 35 DAT. BRRI dhan28 × application of pre-emergence herbicide followed by one hand weeding at 35 DAT produced the highest grain yield. Application of pre-emergence herbicide followed by one hand weeding at 35 DAT was effective for controlling weed and obtaining highest grain yield. So, for the control of weeds in effective manner and in order to get maximum grain yield in boro rice, BRRI dhan28 with the application of pre-emergence herbicide followed by one hand weeding at 35 DAT might be recommended.

Knowledge Management: Journal