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Effect of Low Temperature on Yield Components of Aman Rice Varieties

Md. Sohel Rana
MS Student
Department of Environmental Science, BAU, Mymensingh

Dr. Md. Abdul Baten
Professor
Department of Environmental Science, BAU, Mymensingh

Dr. Md. Tariqul Islam
Principal Scientific Officer and Head
Crop Physiology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A pot experiment was conducted with five varieties viz., Binadhan-4, Binadhan-7, Binadhan-11, Binadhan-12 and Binasail in the plant growth chamber at Bangladesh Institute of Nuclear Agriculture, Mymensingh to assess the effects of low temperature at different growth stages on yield and yield attributes. Five temperature treatments viz., T₀ (Ambient), T₁ (20°C at tillering stage), T₂ (20°C at panicle initiation stage), T₃(20°C at booting stage), and T₄ (20°C at flowering stage) were imposed. The number of total tillers and effective tillers plant^-1, filled and unfilled grains panicle^-1, 1000-grain weight and total grain yield were significantly affected by temperature treatments. Temperature treatments did not affect the number of total tillers plant^-1 and panicle length. Among the varieties, Binadhan-7 produced the highest grain yield under the treatments. So, Binadhan-7 seems to be tolerant to low temperature (20⁰C).

Keywords: Low temperature, Growth stage, Rice, Yield

Location: Plant growth chamber at Bangladesh Institute of Nuclear Agriculture (BINA)

Start Date: 22-06-2014

End Date: 31-12-2014

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

The objectives of the study were to assess the effects of low temperature at different growth stages on yield and yield attributes of rice varieties and to find out the variety tolerant to low temperature.

Methodology:

A pot experiment was conducted with the varieties Binadhan-4, Binadhan-7, Bimadhan-11, Binadhan-12 and Biansail in a plant growth chamber at Bangladesh Institute of Nuclear Agriculture (BINA) during June to December, 2014 to assess the effect of low temperature at different growth stages on yield and yield attributes of aman rice varieties. The following five treatments, viz. T₀ (ambient temperature), T₁ (20°C at tillering stage), T₂ (20°C at panicle initiation stage), T₃(20°C at booting stage), and T₄(20°C at flowering stage) were applied for seven days at each respective growth stage and then plants were allowed to grow at ambient temperature up to maturity. The soil for the experiment was collected from BINA campus. The soil was silt loam, organic matter 1.05%, total N 0.07%, available P 14.3 ppm, exchangeable K 0.25 meq. per 100g soil, available S 13.2 and soil pH 6.67. The experiment was laid out on Completely Randomized Design, where each treatment was replicated 3 times. Seedlings were uprooted carefully from the seedbed and bundled with proper care. On 24 July, 2014, 32 days old seedlings were transplanted in the puddle pots. One seedling was transplanted in a pot. Soils were fertilized with urea 1.72 g/pot, TSP 1.06 g/pot, MP 0.215 kg/ha, 0.80 g/pot corresponding to urea 215 kg/ha TSP 180 kg/ha, MP 100 kg/ha, respectively. At maturity, three pots were harvested for each treatment. After harvest data were recorded on plant height, number of total, effective and non-effective tillers plant^-1, number of filled and unfilled grains panicle^-1and grain yield plant^-1. The collected data were analyzed statistically following two factor experimental design of CRD by MSTAT computer packages. The mean differences among the treatments were calculated with Duncan’s Multiple Range Test.

Source of Information: MS thesis by MD SOHEL RANA, Examination Roll No. 13Ag ENVSJD12M, Reg. No. 41101, Session: 2013-14, July-December Semester, 2014, Department of Crop Botany, BAU, Mymensingh

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The number of total tillers and effective tillers plant^-1, filled and unfilled grains panicle^-1, 1000-grain weight and total grain yield of rice varieties were significantly affected by temperature treatments. Temperature treatments did not affect the number of total tillers plant^-1 and panicle length. Among the varieties, Binadhan-7 produced the highest grain yield under the treatments. So, Binadhan-7 seems to be tolerant to low temperature (20⁰C).

Knowledge Management: Thesis