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Effect of Age of Seedling and Depth of Transplanting on the Performance of Transplant Aman Rice Under System of Rice Intensification

Md. Jahangir Alam
Cotton Development officer
Cotton Development Board

Najrul Islam
Professor
Department of Agronomy, Bangladesh Agricultural University, Mymensingh.

Md. Abdur Rahman Sarker
Professor
Department of Agronomy, Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

An experiment was carried out at the Agronomy field laboratory, Bangladesh Agricultural University, Mymensingh during the transplant aman rice season (June to December 2005) with the view to studding the performance of transplant aman rice variety BRRI dhan41. The experiment comprised three seedling ages, such as 8, 12 and 16 days-old seedling and three depth of transplanting, such as 1, 2 and 3 cm under system of rice intensification (SRI). The plant height, total tillers hill^-1, effective tillers hill^-1, 1000-grain weight, grain yield, and straw yield where achieved by transplanting 16 day-old seedling, plant height, number of total tillers, number of effective tillers, panicle length, grain panicle^-1, 1000-grain weight, grain yield and straw yield were highest when 2 cm depth of transplanting was used. Interaction between seedling age and depth of transplanting was not significant for yield and yield components, Grain, straw and biological yield were found highest in the combination of 16 day-old seedlings× 2 cm depth of transplanting.

Keywords: BRRI dhan41, Seedling Age and Depth of transplanting.

Location: Agronomy field laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-06-2005

End Date: 00-12-2005

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To evaluate the performance of BRRI dhan41 as affected by different seedling ages and depths of transplanting under SRI practice.

Methodology:

The experiment was Conducted at the Agronomy field laboratory, Bangladesh Agricultural University, Mymensingh during June to December 2005, laid out in a randomized complete block design with four replications. Each replication represented a block in the experiment. Each block was divided into 9 unit plots. The total number of plots in the experiment was 36 (3×3×4).The size of unit plot was 4.0m×2.5m (=10m²).The spaces between replication and between unit plots was 1.0m and 0.75m respectively. Two factors were included in the experiment (i) Seedling age-3, viz. 8 day-old seedling,12 day-old seedling and 16 day-old seedling. (ii) Depth of transplanting-3, viz. 1 cm, 2 cm and 3cm. BRRI dhan41 a salt tolerant variety of aman rice was developed by the Bangladesh Rice Research Institute (BRRI). This variety was developed from a crossing of BR23 and BR1185-2B-16-1 and was released in 2000. It is a photosensitive variety. The cultivars BRRI dhan41 takes about 148-153 days to mature. It attains a plant height of 120 cm at maturity. Seed were collected from the BAU farm laboratory. Healthy seeds were selected by specific gravity method. Seeds were then immersed in water in bucket for 24 hours. Then seeds were taken out of water and kept thickly in gunny bags. The seeds started sprouting after 48 hours and were sown after 72 hours. Sprouted seeds were sown in broadcast method in the wet nursery bed on 16, 20 and 24 July 2005 to obtain seedlings of different ages at the time of transplanting. Cow dung was applied in all the unit plots at the rate of 10 ton ha^-1 during the land preparation. Besides, recommended does of fertilizer were applied in the unit plot at the rate of 220, 50, 60, 33 and 5 kg ha^-1 of urea, Triple super phosphate (TSP), Muriate of potash (MoP), Gypsum and Zinc sulphate respectively. 8, 12 and 16 day-old seedling was transplanted on 4 August 2005 in the plot. One seedling was transplanted in each hill maintaining a spacing of 30 cm×30 cm. The seedlings were transplanted in 1, 2 and 3 cm depth after uprooting in order to prevent the root from during and leave from yellowing.

Source of Information: BANGLADESH RESEARCH PUBLICATIONS JOURNAL, ISSN: 1998-2003, Volume: 11, Issue: 4, Page: 288-293, September - December 2015

Article Link (Online Journal): http://www.bdresearchpublications.com/admin/journal/upload/1410094/1410094.pd

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Result revealed that seedling age had significant influence on growth parameters at all sampling dates. The tallest plants and the highest tillers hill^-1were obtained in 16 day-old seedlings and shortest one from 8 day-old seedlings at maximum growth stage. At harvest, all the crop characters except plant height, panicle length and straw yield were significantly influenced by seedling ages. Total number of tillers hill^-1, number of effective tillers hill^-1, number of grains panicle^-1 and 1000-grain weight were highest in 16 day-old seedlings. The highest grain yield, straw yield and harvest index were obtained from 16 day-old seedlings and lowest from 8 day-old seedlings.

Results of the experiment showed that transplanting depth had significant influence on the growth parameters at all sampling dates. The highest plant height, number of total tillers hill^-1, effective tillers hill^-1, grain yield and straw yield were obtained from 2 cm depth of transplanting. 2 cm depth of transplanting produced higher grain yield, straw yield, biological yield and harvest index then that of 1 and 3 cm transplanting depth.

Interaction effect of seedling age and transplanting depth was significant in respect of plant height and number of tillers hill^-1. At harvest all of the plant characters except panicle length, 1000-grain weight and straw yield were significantly influenced due to this interaction. Combination of 16 day-old seedlings × 2 cm depth of transplanting was found best in respect of plant height, number of total tillers hill^-1, number of effective tillers hill^-1, number of grain panicle^-1, grain yield, biological yield and harvest index whereas, the highest number of non-effective tillers hill^-1 and number of sterile spikelet's panicle^-1 were found with the combination of 8 day-old seedlings × 3 cm depth of transplanting.

Based on the results of the present study, it may be concluded that the 16 day-old seedlings coupled with 2 cm depth of transplanting showed better performance in respect of yield and yield components than 8 day-old seedlings with 1 and 3 cm depth of transplanting in transplant aman rice cv. BRRI dhan41 under SRI technique. Bangladesh is an ecologically diverse country with many different farming conditions and large seasonal differences. Although, SRI is a very promising technique of rice cultivation, it may not be well suited to all regions and all seasons in Bangladesh. Transplant aman is a difficult season for flooding, so transplanting of tender aged seedlings are sometimes hampered in this season. Moreover, water management, suitable leveling of land is also difficult. Thus there are a number of issues that need to be resolved before SRI is taken up on a large scale in Bangladesh context especially in kharif season with transplant aman rice.

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