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Influence of Variety and Weeding Regime on the Yield of Transplant Aman Rice

Md. Sazzad Hossain Sohel
Department of Agriculture Extension, Khamarbari Rd, Dhaka, Bangladesh

Md. Anowarul Haque
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

Md. Mohshin Ali Mondol
Bangladesh Sugar and Food Industries Corporation, Chinishilpa Bhaban, Dhaka, Bangladesh

Md. Masud Rana
Agronomy Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

Ahmed Khairul Hasan
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

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

Abstract/ Executive Summary:

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to evaluate the effect of variety and weeding regime on the yield of transplant Aman rice. The experiment consisted of three cultivars BRRI dhan49, BRRI dhan51 and BRRI dhan52 and six different weeding regimes such as no weeding, one hand weeding at 30 DAT, two hand weeding at 30 DAT and 45 DAT, three hand weedings at 30 DAT, 45 DAT and 60 DAT, application of Rifit 500 EC at 7 DAT and application of Rifit 500 EC at 7 DAT + One hand weeding at 30 DAT. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Nine weed species belonging to five families infested the experimental plots. Weed population and weed dry weight were significantly affected by cultivar and weeding regimes. The maximum weed growth was noticed with the dwarf cultivar BRRI dhan51 and minimum with taller cultivar BRRI dhan52. BRRI dhan49 produced the higher grain and the straw yields. The highest loss of grain yield was obtained in no weeding treatment and the lowest was obtained in Rifit 500EC at 7 DAT + one hand weeding at 30 DAT treatments. The highest number of effective tillers hill^-1, number of grains panicle^-1, 1000-grain weight were observed in Rifit 500EC at 7 DAT + one hand weeding at 30 DAT treatment. Application of Rifit 500EC at 7 DAT + one hand weeding at 30 DAT was more effective and economic than the other weed control treatments in controlling weeds and in producing higher grain yield. So, in order to control weeds effectively and to get the economic yield in transplant Aman rice, application of Rifit 500EC at 7 DAT + one hand weeding at 30 DAT might be recommended.

Keywords: Aman rice, Economic analysis, Rifit 500EC, Weed, Dry weight

Location: Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh.

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Weed management, Rice

Objectives:

To evaluate the weed control efficiency of different weeding regimes and their effects on yield and yield components of transplant Aman rice.

Methodology:

The experiment was carried out at the Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh. The experimental site is located at 24°75' N latitude and 90°50' E longitude at an elevation of 18 m above the mean sea level. 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 (UNDP and FAO, 1988). The soil of the experimental field was more or less neutral in reaction with pH value 6.8, low in organic matter and fertility level. The land type was medium high with silty 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) and scanty of rainfall associated with moderately low temperature during Rabi season (October to March). The treatments comprised of three BRRI released high yielding varieties viz., BRRI dhan49, BRRI dhan51 and BRRI dhan52 and six weeding regimes viz.; No weeding, one hand weeding at 30 DAT, two hand weeding at 30 DAT and 45 DAT, three hand weeding at 30 DAT, 45 DAT and 60 DAT, Rifit 500 EC at 7 DAT and Rifit 500 EC at 7 DAT + One hand weeding at 30 DAT. The experiment was laid out in a randomized complete block design with three replications. The sprouted seeds were sown in the nursery bed on 27 June 2013. Proper care was taken to raise the healthy seedlings in the nursery bed. Weeds were removed and irrigation was given in the nursery bed as and when necessary. The main field was opened with a power tiller and subsequently ploughed four times with country plough followed by laddering. The layout of the field was made after final land preparation. The land was fertilized with urea, triple superphosphate, muriate of potash, gypsum and zinc sulphate as per recommendation of BRRI for BRRI dhan49, BRRI dhan51 and BRRI dhan52. Varieties BRRI dhan49, BRRI dhan51 and BRRI dhan52 Were fertilized with 170-83-100-100-10 kg ha^-1 urea, triple superphosphate, muriate of potash, gypsum and zinc sulphate, respectively. The entire amounts of triple superphosphate, muriate of potash, gypsum and zinc sulphate were applied at the time of final land preparation. Urea was applied in three equal installments at 15 DAT, 30 DAT and 45 DAT. Seedlings were transplanted in the well prepared puddled field on 31 July 2013 at the rate of two seedlings hill^-1, maintaining row and hill distance of 25 cm and 15 cm, respectively. The experimental plots were irrigated as and when necessary and excess water was drained out at the time of heavy rainfall. Data on weed population were collected from each plot at 30 DAT, 45 DAT and 60 DAT of the rice plants by using 0.25m × 0.25m quadrate as per method described by Cruz et al. (1986). The crops were harvested at full maturity. The data of weed parameters were collected at 30, 45 and 60 DAT of rice plants. Weed parameters such as weed population (no. m^-2) and total weed dry weight (g m^-2) were collected. Crop characters such as, number of effective tillers hill^-1, number of grains panicle^-1, 1000-grain weight (g), grain yield (t ha^-1) and straw yield (t ha^-1) were recorded. The collected data were compiled and tabulated for statistical analysis. Data were analyzed statistically for analysis of variance (ANOVA) following the method described by Gomez and Gomez (Gomez and Gomez, 1984). MSTATC computer software was used to carry out statistical analysis. Partial economic analysis was done based on the prevailing market price.

Source of Information: International Journal of Biosciences, Vol. 16, No. 4, p. 390-403, 2020

Article Link (Online Journal): http://dx.doi.org/10.12692/ijb/16.4.390-403

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded from the study that, the highest net income was obtained from BRRI dhan 49 under the treatment of Rifit 500EC + one hand weeding at 30 DAT. Application of Rifit 500EC + one hand weeding at 30 DAT was effective and economic than the other weed control treatments in controlling weeds and in producing the highest grain yield. Therefore, for the control of weeds in effective manner and in order to get considerable amount of grain yield in transplant Aman rice, application of Rifit 500EC + one hand weeding at 30 DAT might be recommended.

Knowledge Management: Journal