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Determination of Growth Stages of Some Rice Varieties as Affected by Sowing Time.

Md. Abdullah-Al-Mahbub
Scientific officer
Plant Physiology Division, BRRI, Gazipur

Dr. Serajul Islam
CSO and Head
Plant Physiology Division, BRRI, Gazipur

Abstract/ Executive Summary:

Objective of this study was to investigate the duration of different developmental stages of long and short duration rice varieties when seeded at different in Boro season and to find out the required degree days for determination of panicle initiation of short and long duration varieties. When seeds were sown at mid November the growth duration was the highest. The growth duration was 42 days for BR1, 37 days for BRRI dhan28 and 34 days for BRRI dhan29 as sowing date shifted from mid November to mid February. The use of degree days which expresses the influence of mean temperature on the developmental rate. The degree days (⁰Cd) requirements were 840.8±3.6, 810±7.6 and 967.8±11.4 for BR1, BRRI dhan28 and BRRI dhan29 respectively. The results indicate that the variation in the requirement of DD for a long duration variety (BRRI dhan29) was higher than that of BR1 or BRRI dhan28 i.e. short duration varieties. The short duration varieties reached panicle initiation stage 3-27 days earlier than maximum tillering stage when sowing time was mid November to mid February. But in case of long duration rice varieties, panicle initiation stage occurs earlier or later depends on sowing date of the crop.

Keywords: Growth stages, Sowing time, BRRI dhan.

Location: Plant Physiology Division, BRRI, Gazipur

Start Date: 00-07-2004

End Date: 00-06-2005

Program Area: Variety and Species

Commodity: Rice

Objectives:

To investigate the duration of different developmental stages of long and short duration rice varieties when seeded at different in Boro season.
To find out the required degree days for determination of panicle initiation of short and long duration varieties.

Methodology:

The study was conducted at BRRI, Gazipur. Varieties: BR1, BRRI dhan28, BRRI dhan29. Methods of growing plants: Seedling at five-leaf stage grown in plastic tray containing culture solution was transplanted in the field. TSP, MP, Gypsum were applied as basal dose and urea was applied at three splits. All fertilizers were applied as per BRRI recommendation. Sowing date: 15 November to 15 February at every 15 days intervals. Replication: 3 Design: RCBD. Degree days (DD): Degree days can be calculated as follows: DD =∑ (Tmean-Tb)

Source of Information: Proceedings of the BRRI Annual Internal Review for 2004-2005 (Held on 18-22 December 2005). Bangladesh Rice Research Institute (BRRI). Gazipur -1701.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Growth duration: When seeds were sown at mid November the growth duration was the highest. As sowing dates advanced, the growth duration gradually decreased irrespective. In fact, the duration of growth duration was 42 days foe BR1, 37 days for BRRI dhan28 and 34 days for BRRI dhan29 as sowing date shifted from mid November to mid February. e) Degree days (DD): The use of degree days which expresses the influence of mean temperature on the developmental rate. So, it seems attractive to use for phonological forecasting of rice crop. The degree days (⁰Cd) requirements were 840.8±3.6, 810±7.6 and 967.8±11.4 for BR1, BRRI dhan28 and BRRI dhan29 respectively. The results indicate that the variation in the requirement of DD for a long duration variety (BRRI dhan29) was higher than that of BR1 or BRRI dhan28 i.e. short duration varieties. However, this variation is within the range of acceptance. So DD can be used to predict the growth phases of rice crop particularly days required for panicle primordium.

Knowledge Management: Report/Proceedings