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Evaluation of Boro Rice Varieties Under Conventional and Double Transplanting Methods

R Yasmeen
Plant Physiology Division, Bangladesh Rice Research Division, Gazipur Bangladesh.

MM Rashid
Plant Physiology Division, Bangladesh Rice Research Division, Gazipur Bangladesh.

S Pervin
Plant Physiology Division, Bangladesh Rice Research Division, Gazipur Bangladesh.

A Biswas
Plant Physiology Division, Bangladesh Rice Research Division, Gazipur Bangladesh.

S Akter
Plant Physiology Division, Bangladesh Rice Research Division, Gazipur Bangladesh.

T Halder
Plant Physiology Division, Bangladesh Rice Research Division, Gazipur Bangladesh.

Abstract/ Executive Summary:

Over aged rice seedlings may have shorter period for vegetative growth which produce fewer sources for supply in to the sink. Rice yield is reduced by transplanting aged seedlings under conventional transplanting during Boro season. A field experiment was conducted during the dry (Boro) season of 2013 - 14 at the research farm of Bangladesh Rice Research Institute, Gazipur. Changes in plant growth and physiological parameters of three rice varieties viz., BRRI dhan28, BRRI dhan29 and BRRI dhan45 were evaluated under conventional transplanting with 3 seedling age of 40, 60 and 80 - day - old and double transplanting with 80 (40+40) - day - old tillers. The experiment was conducted in RCB design with 3 replications. Total dry matter production, flowering duration and panicles per unit area were significantly higher in BRRI dhan29 than other two tested varieties which resulted in significantly higher grain yield. Irrespective of varieties tillering rate was high in double transplanting than conventional planting with different seedling age at earlier crop stages, while productive tiller per unit area was significantly higher in conventional transplanting using 40 - day - old seedlings at later stage. Conventional transplanting using 40 - day - old seedlings had significantly higher dry matter, panicles per unit area and grains per panicle than double transplanting and other conventional transplanting treatments which resulted in significant ly higher grain yield. On the contrary, double transplanting had significantly higher dry matter and panicles per unit area which contributed to higher grain yield over 80 - day - old conventional nursery seedling. Double transplanting of Boro rice is an alter native option of late planted Boro rice either to reduce the yield loss or to keep it at a minimum level.

Keywords: Rice, Conventional transplanting, Double transplanting, Growth characters and Yield

Location: Bangladesh Rice Research Institute, Gazipur

Start Date: 00-00-2014

End Date: 00-00-2014

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To examine the performance of double transplanting along with conventional transplanting using 40, 60 and 80 - day - old seedlings and double transplanting on the growth, some physiological parameters and yield of Boro rice.

Methodology:

The experiment was conducted at the farm of Bangladesh Rice Research Institute (BRRI), Gazipur during Boro season, 2013 - 14. The experimental site is located at the center of the agro ecological zone of Madhupur tract (AEZ - 28). Sprouted seed s of BRRI dhan28, BRRI dhan29 and BRRI dhan45 were sown in the seedbed on 20 November 20 13. Forty days old seedlings were transplanted at 10 cm × 10 cm spacing with higher number of seedlings per hill (9 seedlings) in a separate plot on 30 December. After 40 days of first transplanting, the entire hill s were uprooted and again transplanted in the main field with 2 - 3 tillers/hill at 20 cm × 20 cm spacing on 9 February for double transplanting according to Khatun, 2007. Nursery seedlings were transplanted at 20 cm × 20 cm spacing in the main fields for conventional transplanting. Optimum Boro rice transplanting period of Bangladesh is about 20 days from 01 to 20 January.

Performance of double transplanting with (40+40) days old seedlings was compared with conventional transplanting with 40, 60 and 80 - days - old seedlings which were transplanted on 31 December, 20 January and 9 February respectively. The experiment was laid out in Randomized Complete Block Design with three replications. The unit plot size of all treatment combinations was 3 × 4 m². The soil was fertilized with 150 - 20 - 65 - 12 kg ha^-1 of NPK and S in the form of urea, TSP, MOP and gypsum respectively. The full amount of fertilizers except urea was applied at the final land preparation. Urea was top dressed in three equal splits at 15 and 30 days after transplanting, respectively. Third dose was applied 5 - 7 days before panicle initiation. Tillering rate was measured at 7 days interval by four adjacent hills basis an d tiller number/hill was converted into tiller/m 2. Samples for yield components were taken from twelve representative hills and then it was converted for whole plot area. The area selected for grain yield was 5 m². Grain yield was adjusted at 14% moisture level. The data were analyzed using CROPSTAT 7.2 statistical software.

Source of Information: Eco-friendly Agril. J.9(06): 35-41, 2016 (June), ISSN 1999-7957

Article Link (Online Journal): http://efaj-international.com/wp-content/uploads/2016/06/3-EFAJ-43-05-2016.p

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Effective tiller per unit area, total dry matter production, panicles/m² and grain/ panicle were higher in conventional transplanting with 40 - day - old seedlings which ultimately produced more grain yield. Aged seedlings caused yield reduction which was more in short duration rice varieties - BRRI dhan28 and BRRI dhan45 than long duration variety BRRI dhan29 . The results revealed that double transplanting did not have yield advantage to conventional transplanting, but minimize the yield reduction due to transplanting of aged seedlings.

Knowledge Management: Journal