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Photosensitive Rice (oryza Sativa L.) Varieties Under Delayed Planting as an Option to Minimize Rice Yield Loss in Flood Affected T. Aman Season

A Biswas
SO
BRRI

M M E Ahmed
SO
BRRI, Gazipur, Bangladesh

T Halder
SO
BRRI, Gazipur, Bangladesh

S Akter
SO
BRRI, Gazipur, Bangladesh

R Yeasmin
CSO (CC)
BRRI, Gazipur, Bangladesh

M S Rahman
PSO
BRRI, Gazipur, Bangladesh

Abstract/ Executive Summary:

Photosensitive rice varieties have higher advantages in delayed planting. We experimented to figure out the degrees of delayed planting and evaluate the performance of six modern Aman rice varieties (BR11, BR22, BR23, BRRI dhan46, BRRI dhan54) against three sets of delayed planting. Each rice variety showed considerable variations for plant height, days to panicle initiation, flowering, and maturity. BR22, BR23, and BRRI dhan54 led a drastic reduction in days to panicle initiation and varied from 65 to 58 days, 69 to 60 days, and 62 to 55 days, respectively, while it ranged from 76 to 80 days for the control variety BR11. Similarly, days to flowering follow the same trend. Grain yield of BR22, BR23 reduced at the third set with a value ranging from 5.8 to 5.0 t/ha, 6.1 to 5.1 t/ha, respectively, while BRRI dhan54 showed consistency in grain yield with a range from 5.3 to 5.2 t/ha. In contrast, grain yield of remaining rice varieties ranged between 5.7 to 4.5 t/ha for BRRI dhan46, 6.2 to 3.9 t/ha for BRRI dhan46, while we found severe reduction for the control variety BR11 with a range from 4.4 to 2.0 t/ha.

Keywords: Delayed planting, Photosensitive rice, Physiological growth, Grain yield

Location: Plant physiology division, BRRI, Gazipur

Start Date: 05-07-2017

End Date: 10-10-2018

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

The present study was under taken to figure out the degrees of delayed plantation and evaluate the performance of six modern Aman rice varieties (BR11, BR22, BR23, BRRI dhan46, BRRI dhan54) against three sets of delayed planting in T. Aman season.

Methodology:

Plant materials: BRRI has so far developed five photosensitive rice varieties namely BR22, BR23, BRRI dhan44, BRRI dhan46 and BRRI dhan54 along with BR11 as control were selected to execute the experiment. Growing rice plants in the field: The experiment was carried out in the research field of the Plant Physiology Division located at BRRI Gazipur, Bangladesh during T. Aman 2017. Three different planting time including 30^th August, 6^th September and 13^th September were considered as three sets of delayed planting and designated as 1^st set, 2^nd set, and 3^rd set respectively. Seedlings were raised in the ideal seed beds and uprooted for transplanting at five leaves stage. By following planting dates, seedlings were transplanted in well puddle paddy soils. The experiment was laid out in a split plot design with three replications. Three sets of transplanting dates were placed in the main plots and varieties in the sub-plots. The unit plot size was designed 2.5 m X 2.0 m followed by 20 cm × 20 cm spacing. Fertilizer doses were applied as urea, triple super phosphate, muriate of potash, and gypsum @ 80-50-50-10 kg per hectare for N, P₂O₅, K₂O and S respectively. Full doses of triple super phosphate, muriate of potash, and gypsum were incorporated at the time of final land preparation while urea was applied in three equal splits at 15, 30 and 45 days after transplanting. During the growing period, intercultural operations were carried out as necessary. Evaluation of agronomic traits: Data on plant height, days to panicle initiation, days to flowering, days to maturity were recorded in the suitable growth stages of rice varieties. For yield estimation, the whole plot was harvested and grain yield of each plot was recorded accordingly. Data analysis: Data analyses were performed using Statistical Tool for Agricultural Research (STAR), version 2.0.1, developed by International Rice Research Institute (STAR, 2013).

Source of Information: BRRI Annual Report

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Among the three sets of delayed planting, significant variation of evaluated agronomic traits indicated the presence of higher variability in performances of existing Aman rice varieties. Along with suitable agronomic performances, the strongly photosensitive rice varieties BR22, BR23, and BRRI dhan54 showed greater benefits in terms of grain yield when compared with moderately photosensitive rice varieties BRRI dhan44, and BRRI dhan46. Besides, the consistent grain yield of BRRI dhan54 suggested higher suitability of this rice variety in terms of vegetative growth and yield across delayed planting areas as well as in flood-affected areas of Bangladesh.

Knowledge Management: Report/Proceedings