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Effect of Weeding and Urea Super Granule Application on the Growth and Yield of Boro Rice Cv. BRRI Dhan45

M. E. Hossain
Soil Science Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

M. A. UlIah
Plant Breeding Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

A. R. Gazi
TCP Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

M. A. Kader
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from December 2008 to May 2009 with a view to find out the effect of weeding and Urea Super Granules (USG) fertilizer on the yield and yield characters of Bora rice BRRI dhan45. There were two sets of treatments; a) three weedings viz., no weeding, one weeding and two weeding and b) five levels of USG viz., control (no USG), one, two, three and four pellet (s) of USG per 4 hills, respectively. The experiment was laid out in a randomized complete block design with three replications. Grain and straw yields were the highest (4.00 and 5.78 t ha^-1, respectively) in two weedings. The lowest grain yield of 3.44 t ha^-1 was obtained from no weeding. Level of USG significantly influenced all the plant characters, except; plant height, panicle length and weight of 1000-grain. Grain and straw yields were found the highest (4.44 and 5.89 t ha^-1, respectively) from the level of 4 pellets of USG per 4 hills. The interaction effect of weeding and level of USG had significant influence on all the crop characters under study, except plant height, panicle length and weight of 1000-grain. The finding of the study suggested that two weedings in combination with 4 pellets of USG per 4 hills gave the highest grain yield of 4.90 t ha^-1 of the boro rice variety BRRI dhan45.

Keywords: Boro rice , Urea Super Granule (USG), Weeding

Location: Agronomy Field laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-12-2008

End Date: 00-05-2009

Program Area: Crop-Soil-Water Management

Commodity: Rice, Weed management, Fertilizer

Objectives:

To find suitable weed management practices and USG application on the growth and yield of boro rice.

Methodology:

The experiment was conducted at the Agronomy Field laboratory, Bangladesh Agricultural University, Mymensingh during the period from December 2008 to May 2009. The experimental area belongs to Sonatala soil series under Old Brahmaputra Flood plain (AEZ-9). The experimental field belongs to Non-calcareous Dark Grey Floodplain Soil. The field was a medium high land of silty loam soils having pH around 6.5. Two sets of treatments were imposed as; Factor A: weeding - 3: no weeding (W_o), l- one weeding (W₁) and two weedings (W₂) and Factor B: level of urea super granules (USG) - 5: control (No pellet of USG)≈ 0 kg N ha (N₀), one pellet of USG (1.8 g) per 4 hills ≈30 kg N ha (N₁), two pellets of USG (3.6 g) per 4 hills ≈60 kg N ha (N₂), three pellets of USG (5.4 g) per 4 hills ≈ 90 kg N ha (N₃) and four pellets of USG (7.2g) per 4 hills ≈120 kg N ha (N₄). The experiment was laid out in a randomized complete block design with three replications. Total number of unit plots were 45 (3 x 5 x 3). Spaces between blocks and unit plots were 1 m and 0.5 m, respectively. The size of unit plot was 10 m² (4.0 m x 2.5 m). The seeds started sprouting after 48 hours and became suitable for sowing in 72 hours. The nursery bed was made wet by application of water one day ahead of uprooting the seedlings. Thirty-one days old seedlings were uprooted carefully without causing any mechanical injury to the root. The seedlings were then transplanted on first January 2009 in the well puddled plots. The plots were fertilized with 100, 75, 60 and 10 kg ha^-1 of triple super phosphate, muriate of potash, gypsum and zinc sulphate, respectively at the time of final land preparation. As per experimental specification one, two, three or four pellet (s) of USG were placed manually at a depth of 6-8 cm at the centre of four hills of two adjacent rows at five days after transplanting. Three seedlings were transplanted in each hill with a spacing of 25 cm × 15 cm. Seedlings in some hills died off and those were replaced by gap filling after one week of transplanting with seedlings from the same source. Weeding was done as per treatment. During weeding, different weed species grown in the experimental filed were identified. A constant level of standing water up to 5 cm was kept in early growth stage in the experimental field to enhance tillering and th e water level was increased to some extent to discourage late tillering. The field was finally drained out before 15 days of harvest to enhance maturity. No remarkable infestation of insect or infection of disease was noticed in the field. Therefore, no plant protection measure was taken. Five hills (excluding border hills) from each plot were randomly selected, uprooted and properly tagged before harvesting for recording of necessary data. The crop was harvested at full maturity when 90% of the grains turned golden yellow in colour. Grains were sun dried to a moisture content of about 14% and then weighed. Straw was also sun dried and weighed. Yields of both grain and straw were converted to t ha ^-1 . The following data were recorded: Plant height (cm), number of effective tillers hill ^-1 , panicle length (cm), number of grains panicle ^-1 , 1000-grain weight (g), grain yield (t ha ^-1 ), straw yield (t ha ^-1 ), biological yield (t ha ^-1 ) and harvest index (%). Data on individual plant parameters were recorded from five randomly selected hills of each plot and those on grain yield, straw yield, biological yield and harvest index were recorded from the whole plot at harvest. The collected data were analyzed using the analysis of variance (ANOVA) technique and the significance of the mean differences were adjudged by Duncan’s Multiple Range Test (Gomez and Gomez, 1984).

Source of Information: Bangladesh Journal of Nuclear Agriculture. Vol: 30, pp: 67-74, ISSN 0258-7130, 2014

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The finding of the study suggested that two weedings in combination with 4 pellets of USG per 4 hills gave the highest grain yield of 4.90 t ha^-1 of the boro rice variety BRRI dhan45. Hence, two weedings and 4 pellets of USG weighting 7.2 g of each pellet by placing them in the center of four hills of two adjacent rows with the spacing of 25 cm x 15 cm could be suggested for higher yield of Bora rice variety BRRI dhan45.

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