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Effect of Irrigation Salinity on the Growth and Yield of Two Aus Rice Cultivars of Bangladesh

Tahmina Khanam
Plant Physiology and Biochemistry Laboratory, Department of Botany, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

Nahid Akhtar
Plant Physiology and Biochemistry Laboratory, Department of Botany, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

M.A. Halim
Plant Physiology and Biochemistry Laboratory, Department of Botany, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

Feroza Hossain
Plant Physiology and Biochemistry Laboratory, Department of Botany, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted to clarify the growth and yield response of two rice cultivars, BR55 and BR43 under salt stress. Six different concentrations of NaCl viz 50, 100, 150, 200, 250 and 300 mM and distilled water (control) were applied on the rice cultivars which were grown under pot culture condition. Growth parameters like plant height, tiller number, leaf number and leaf area were negatively affected by salinity in both cultivars. Salt stress caused a significant reduction in yield in both cultivars of rice. Growth reduction was higher in BR43 than in BR55.The reduction in yield and yield parameters were found to be lower in BR55 than those in BR43. The results obtained in the present study suggest that BR55 showed higher salt tolerance than in BR43.

Keywords: Salinity, Growth, Yield, Cultivars, Aus Rice, Irrigation

Location: Botanical garden of Jahangirnagar University, Savar, Dhaka

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Non-commodity: Performance

Objectives:

To clarify the effect of salinity on growth, development and yield of two contrasting salt tolerance rice cultivars at different stress duration.

Methodology:

Plant materials: Two rice cultivars (Oryza sativa L.), BR55 and BR43 were used as plant materials. Rice seeds were collected from Bangladesh Rice Research Institute (BRRI). Both cultivars are Aus rice. Treatments: Six different levels of NaCl solution (50, 100, 150, 200, 250 and 300 mM) and distilled water as control were applied in this experiment. Pot preparation and management practices: Pot experiments were carried out in the experimental field of Botanical garden of Jahangirnagar University, Savar, Dhaka. Pots were filled with (12 kg per pot) air dried soil. The P^H value and cation exchange capacity of the soil were 7.12 and 0.20 (mg/100g dry soil) respectively. Before sowing 0.41 gm of TSP, 0.5 gm of MOP and 0.81 gm of gypsum per pot were incorporated into the soil and sufficient water was added to saturate the soil. The pots were kept under natural sunshine till harvesting. Seeds of uniform size were directly sown in pots. Distilled water was applied in all pots up to the emergence of seedlings. After seedling establishment distilled water in control pots and 12.5 mM NaCl solution were applied in salt treatment. When the first leaf appeared, actual amount of NaCl solution were applied at 3 days interval. The salt solution were applied till harvest. Regular watering and weeding were made to ensure equal environmental condition throughout the experimental period. Measurement of growth and yield: Plant height, leaf number, tiller number and leaf area of two rice cultivars were measured at 10, 20, 30 and 40 days after treatment (DAT). Yield and yield contributing parameters like yield per plant, filled grain number per plant, total grain number per plant and panicle number per plant were recorded at final harvest. Statiscal analysis: The experiment was arranged out in randomized block design with three replications. Statistical analysis of the collected data were performed using Analysis of Variances (ANOVA). All statistical analysis were performed with the SPSS statistical package (SPSS program 16.00). Tukey’s HSD test was performed to identify significant differences among the treatments.

Source of Information: Jahangirnagar University J. Biol. Sci. 7(2): 1-12, 2018 (December)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study indicates that BR55 showed relatively higher tolerance to salinity than BR43 on the basis of growth and yield performance. Therefore, further research should be focused on bio-molecular mechanisms involved in salinity tolerance for the determination of key pathways controlling salinity tolerance in plants.

Knowledge Management: Journal