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Determination of Lodging Characters of Some BRRI Recommended Rice Varieties at Three Nitrogen Levels During Wet Season in Bangladesh

M. A. A. Mahbub
Plant Physiology Division, Bangladesh Rice Research Institute, Joydebpur, Gazipur-1701, Bangladesh

M. Khanam
Plant Physiology Division, Bangladesh Rice Research Institute, Joydebpur, Gazipur-1701, Bangladesh

M. S. Rahman
Plant Physiology Division, Bangladesh Rice Research Institute, Joydebpur, Gazipur-1701, Bangladesh

A. R. Gomosta
Plant Physiology Division, Bangladesh Rice Research Institute, Joydebpur, Gazipur-1701, Bangladesh

M. A. Hossain
Plant Breeding Division, Bangladesh Rice Research Institute, Joydebpur, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

Lodging characters including morphological, anatomical and physiological features of some BRRI recommended rice varieties at three nitrogen levels were studied. Basal internode elongation with thin internode wall is the most important character for lodging. Moment, culm strength and nature of wrapping of the leaf sheath are also important for lodging. Lower moment, higher culm strength and tightly wrapping of the leaf sheath make a variety tolerant to lodging. These characters are greatly influenced by nitrogen application which is more remarkable for lodging susceptible varieties. Lower nitrogen and higher potassium contents in internode help to decrease the lodging tendency of a variety. Rice anatomy is also important for identifying lodging susceptible and tolerant varieties. Results revealed that lodging susceptible variety like BRRI dhan32 has bigger and higher number of intercellular space and lower number of vascular bundles in the culm. According to the lodging tendency, it appears that BRRI dhan 32 is a lodging susceptible variety whereas, BRRI dhan37, BRRI dhan38, BR11 and BR 6110 are semi susceptible, semi tolerant and lodging tolerant varieties, respectively.

Keywords: Lodging character, Rice, Nitrogen level, Wet season

Location: Experimental farm of Bangladesh Rice Research Institute (BRRI) , Gajipur

Start Date: 00-07-2003

End Date: 00-12-2003

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To find out the effect of nitrogen levels on lodging characters of some BRRI recommended rice varieties.

Methodology:

The study was carried out at the Bangladesh Rice Research Institute (BRRI) experimental farm during T. Aman season (wet season) of 2003. Thirty-day-old-seedlings of four BRRI recommended modern rice varieties - BR11, BRRI dhan32, BRRI dhan37 and BRRI dhan38 and one BRRI promising line BR 6110 were transplanted in micro plot (1 m²) replicated 3 times. Three levels of nitrogen, namely 0, 60 and 120 kg N/ha were used. Combination of varieties and nitrogen levels were arranged in Randomized Complete Block Design. Twenty × 20 cm spacing were maintained and two seedlings were transplanted in each hill. Twenty five hills were accommodated in each micro plot. Other fertilizers such as TSP, MP and gypsum except urea were applied as basal dose. Normal cultural practices and plant protection measures were taken as and when necessary. Plants of three hills were collected from each plot at heading to milk stage when the rice plant is more vulnerable to lodging. At first, three median tillers were selected from each selected hill and data were collected from these selected individual tillers. The final data represent the average value of three selected median tillers from each plot. Internode length from basal to 8^th internode, internode thickness and total internode length at different nitrogen level for each variety were measured by using scale and slide calipers. Culm strength was measured by lodging meter. Wrapping score was done by visual observation. Moment was computed by multiplying internode length with internode weight. For measuring the culm strength, the selected plant slanted into 45° by artificial pressure created by lodging meter. This pressure was counted as culm strength. Lodging co-efficient was computed by the formula. Data were subjected to analysis of variance and the means were compared by DMRT.

Source of Information: Bangladesh Journal of Botany, 35(2): 117-124, (2006)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Internode thickness, moment, nature of leaf sheath wrapping, nitrogen content and anatomy of the lower internode are most important characters to identify the lodging susceptible or tolerant varieties in rice. BR11 and BR 6110 have been found to be lodging tolerant varieties, BRRI dhan38 is a semi tolerant variety, BRRI dhan37 is a semi susceptible variety and BRRI dhan32 is a lodging susceptible variety in T. Aman season grown in Bangladesh. Higher nitrogen increased the lodging problem, heavy nitrogen should not be used in case of lodging susceptible variety like BRRI dhan32.

Knowledge Management: Journal