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Effect of Transplanting Date on the Growth and Yield of Modern Aromatic Fine Rice Varieties in Aman Season

M. A. Mannan
Agronomy Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

M. S. U. Bhuiya
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

H. M. A. Hossain
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

M. I. M. Akhand
Research Fellow, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

M. E. Haque
Soil Science Division, Bangladesh Institute of Nuclear Agriculture, Mymensingh, Bangladesh

Abstract/ Executive Summary:

The experiment was done at the Bangladesh Rice Research Institute (BARI) Farm, Gazipur, during the aman season. Modern aromatic rice BR5, BRRI dhan34, BRRI dhan37 and BRRI dhan38 were transplanted with 30 day old seedlings from 22 July and continued up to 7 October at an interval of 15 days in 2008 and 2009. The plant height, number of tiller and dry matter increased with the advancement of planting dates up to 7 September and thereafter decreased gradually. The growth duration and straw yield decreased gradually with the advancement of planting dates. The maximum number of panicles and grains panicle^-1 were found on 22 August planted crop that reflected to produce higher grains yield. Compared to the 22 August planting, grain yield of rice decreased by 14, 7, 8, 34 and 74 percent, respectively, when planted on 22 July, 7 August, 7 September, 22 September and 7 October. The BRRI dhan37 and BRRI dhan38 gave higher grain yield due to higher number of panicles and heavier individual grain weight irrespective of planting date. BRRI dhan34 contained the highest number of grains panicle^-1 and matured 3-5 days earlier than BRRI dhan37 and BRRI dhan38 but exhibited lower grain yield for lower number of panicles and lighter individual grain weight. Thus, the optimum planting time of modern aromatic high yield potential rice BRRI dhan37 and BRRI dhan38 is 17-21 August to obtain maximum grain yield during the aman season.

Keywords: Date of transplanting planting, Modern aromatic rice, Aman season

Location: Bangladesh Rice Research Institute, Gazipur

Start Date: 00-00-2008

End Date: 00-00-2009

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine the optimum date of planting and to find out the modern aromatic fine rice varieties having high yield potential for growing in Aman season.

Methodology:

The experiment was conducted at the Bangladesh Rice Research Institute, Farm, Gazipur in Aman season. The modern aromatic rice BR5, BRRI dhan34, BRRI dhan37 and BRRI dhan38 were transplanted on 22 July (Julian date 203), 7 August (Julian date 218), 22 August (Julian date 233), 7 September (Julian date 248), 22 September (Julian date 263) and 7 October (Julian date 278) with 30-day-old seedlings spaced at 20 cm × 15 cm both in 2008 and 2009. The treatments were distributed in a split-plot design, placing planting date in the main plot and variety in the sub plot and replicated thrice. Fertilizers were applied @ 60-40-40-10-4 kg N, P₂O₅, K₂ O, S and Zn ha^-1, respectively during final land preparation except nitrogen. Nitrogen was top-dressed in three equal splits at 15 dates after transplanting (DAT), 30 DAT and before panicle emergence. Five destructive sample hills were collected from each individual plot to measure the plant height and tiller number at different growth stages. The samples were oven dried for 72 hours in a constant temperature for dry matter determination. For grain and straw yields five square meter areas was harvested from the center of the plot and yield was adjusted to 14% moisture content and expressed in ton ha^-1. The straw was dried in the sun until complete drying and the weight was expressed in ton ha^-1. [Degree of photoperiod sensitivity = (X-Y/X)×100. Where, X = Flowering duration due to long day effect (Seeding on 22 July) Y = Flowering duration due to short day effect (Seeding on 7 September) Regression analysis was done to determine optimum planting time. Optimum planting date of the test varieties was determined by regressing the grain yield with the transplanting dates.

Source of Information: Bangladesh Journal of Nuclear Agriculture. Vol: 29, pp: 127-136, ISSN 0258-7130, 2013

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

BRRI dhan34 contained the highest number of grains panicle^-1 and matured 3-5 days earlier than BRRI dhan37 and BRRI dhan38 but exhibited lower grain yield for lower number of panicles and lighter individual grain weight. Thus, the optimum planting time of modern aromatic high yield potential rice BRRI dhan37 and BRRI dhan38 is 17-21 August to obtain maximum grain yield during the aman season.

Knowledge Management: Journal