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Evaluation of Growth and Yield of Selected Hybrid and Inbred Rice Varieties Grown in Net-house During Transplanted Aman Season

ISLAM, M. SH
Senior Scientific Officer
Agronomy Division, BRRI,

M.S.U. BHUIYA
Professor
Deptt of Agronomy, BAU

A.R. GOMOSTA
Former Director (Res.)
BRRI, Gazipur

A.R. SARKAR
Professor
Deptt of Agronomy, BAU

M.M. HUSSAIN
Chief Scientific Officer
ARD, BRRI.

Abstract/ Executive Summary:

Pot experiments were conducted during T. aman 2001 and 2002 (wet season) at Bangladesh Rice Research Institute (BRRI) in net house. Hybrid variety Sonarbangla-1 and inbred modern variety BRRI dhan-31 were used in both the seasons and BRRI hybrid dhan-l was used in 2002. The main objective of the experiments was to compare the growth and yield behaviour of hybrid and inbred rice varieties under controlled condition. In 2001, BRRI dhan-3l had about 10-15% higher plant height, very similar tillers/plant, 15-25% higher leaf area at all days after transplanting (DAT) compared to Sonarbangla-1. Sonarbangla- 1 had about 40% higher dry matter production at 25 DAT but had very similar dry matter production at 50 and 75 DAT, 4-11% higher rooting depth at all DATs, about 22% higher root dry weight at 25 DAT, but 5-10% lower root dry weight at 50 and 75 DAT compared to BRRI dhan-31. The photosynthetic rate was higher (20 μ mol m-2/sec-1) in BRRI dhan-3l at 35 DAT (maximum tillering stage) but at 65 DAT, Sonarbangla-l had higher photosynthetic rate of 19.5 μ mol m-2 sec-1. BRRI dhan-3l had higher panicles/plant than Sonarbangla-1, but Sonarbangla-1 had higher number of grains/panicle, 1000-grain weight and grain yield than BRRI dhan-31. In 2002, BRRI dhan-31 had the highest plant height at 25 DAT, but at 75 DAT, BRRI hybrid dhan-l had the highest plant height. Sonarbangla-1 had the largest leaf area at 25 and 50 DAT followed by BRRI dhan-31, but at 75 DAT, BRRI dhan-31 had the largest leaf area. The highest shoot dry matter was observed in BRRI dhan-31 followed by Sonarbangla-1 at all DATs. Sonarbangla-1 had the highest rooting depth and root dry weight at all DATs. BRRI dhan-31 gave the highest number of panicles/plant followed by Sonarbangla-I, BRRI hybrid dhan-l had the highest grains/panicle followed by BRRI dhan-31 and Sonarbangla-I had the highest 1000-grain weight followed by BRRI dhan-31. The highest amount of grains/plant (34.6 g) was obtained from BRRI dhan-31.

Keywords: Shoot dry matter, Root dry weight, Leaf area, Photosynthesis, Grain yield.

Location: Bangladesh Rice Research Institute (BRRI) in net house

Start Date: 00-00-2001

End Date: 00-00-2002

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To evaluate the growth and yield behaviour of a few selected hybrid and inbred rice varieties in wet season under controlled condition.

Methodology:

Design and treatments: The experiment varieties were Sonarbangla-l and BRRI hybrid dhan-1 (only in 2002) and an inbred rice BRRI dhan-31. Number, size and arrangement of pots and condition of the net house: A total of 28 earthen pots in 2001 and 42 in 2002 [14 pots for each variety, 3 pots for each sampling (3 x 3 pots) and 5 pots for yield data] were taken with about I 2 kg muddy soil in each pot. The soil was silty clay with O.M 2.1%, pH 6.4-6.7 and total N 0.13%. The pots were kept in the net house. The size of the pots was: 12 inches in height, 20 inches diameter at the top and 9 inches at the bottom. The pots were arranged in the net house in rows variety-wise. The net house was a ware-net covered and well protected chamber. Sunlight and rain could enter easily into the net house. Fertilization and transplanting in the pots: Considering the weight of top-soil (0-15 cm) of the field (6 x 105 kg/ha), the pots with 10 kg soil were fertilized @ 100-26.4-41.5-10-5 kg N, P, K, S and Zn/ha, respectively. All the fertilizers were applied as basal except urea, which was top dressed in 3 equal splits at 15, 30, and 45 days after transplanting. Single 30-day old healthy seedling was transplanted in the middle of each pot. The pots were irrigated with watering can before crack development on the surface soil of the earthen pots. Measurement of growth parameters and photosynthesis: The growth parameters e.g., plant height, tillers/plant, leaf area, rooting depth, shoot and root dry matter were measured from destructive samples. To compare the photosynthetic rate of hybrid (Sonarbangla-1) and inbred (BRRI dhan-31) rice varieties, their photosynthetic efficiency was measured in 2001 with a portable photosynthesis-measuring instrument (LiCOR-6200) at 35 DAT (maximum tillering stage) and at 65 DAT (Booting to flower initiation stage) in clear sunshine at 11 to 12 hrs. The SPAD reading of the varieties was also recorded at the same time. was conducted using a completely randomized design with 3 replications, where varieties were considered as treatments.

Source of Information: Bangladesh J. Agril. Res. 34(1): 67-73, March 2009 ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Sonarbangla-1 produced much higher root dry matter and vigorous shoot growth at seedling stage compared to other hybrid and inbred varieties. The vigorous growth of tested hybrid rice at early growth stage could not increase the grain yield. Poor grain yield of hybrid rice is mainly caused by high pest infestation and grain sterility in T. aman (wet) season.

Knowledge Management: Journal