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Grain Growth and Yield Performance of Aromatic Rice Genotypes Under Different Soil Moisture Regimes

Md. Abdullah-Hil-Hafiz
Former MS Student
Department of Crop Botany, BAU, Mymensingh

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

Dr. Muhammad Abdul Karim
Professor
Department of Crop Botany, BAU, Mymensingh

Abstract/ Executive Summary:

A pot experiment was conducted at Bangladesh Institute of Nuclear Agriculture, Mymensingh during July to December 2007 to assess the effect of moisture stress on morphological characters, grain growth and yield performance of five promising fine grain rice genotypes viz., KD₅-18-150, UD₅-100-6, RM-100-16, RM-100-5 and Ukunimadhu. The soil moisture levels 100, 80, 60, and 40% field capacity were imposed at panicle initiation, booting and flowering stages of the genotypes. These treatments were also maintained from panicle emergence to maturity to study grain growth pattern of the rice genotypes. All the morphological parameters and yield were decreased with the stress. Plant height, number of panicle, panicle length, 1000-grain weight, grain yield hill^-1, total dry matter hill^-1 and harvest index decreased with increasing water stress. However, varieties responded differently for all the characters studied and they had different degrees of reduction. Among the genotypes Ukunimadhu produced the highest yield, number of panicle and panicle length. Grain dry matter accumulation linearly increased from fertilization to 21 days after fertilization, thereafter it did not increase significantly.

Keywords: Grain growth, Yield, Aromatic rice, Soil moisture regimes

Location: Pot yard of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh

Start Date: 00-07-2007

End Date: 00-12-2007

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

To observe the effect of water stress on morphological characters, grain growth, and yield of some aromatic rice genotypes; and identify relative water stress tolerant genotypes

Methodology:

An experiment was conducted in plastic pots with 5 rice genotypes viz., KD₅-18-150, UD₅-100-6, RM-100-16, RM-100-5 and Ukunimadhu at the pot yard of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh during July to December 2007. Each pot contained 9 kg of soil. Soils were fertilized with urea 1.05 g/pot, TSP 0.87 g/pot, MP 0.42 g/pot corresponding to urea 170 Kg/ha, TSP 135 Kg/ha and MP 65 Kg/ha, respectively. All TSP, MP, one-third of the urea were applied as basal dose. The remaining two-thirds of the urea were applied in two equal splits in each pot at 30 and 50 days after transplanting (DAT). The 40 days old seedlings were transplanted in the pots on 10 August 2007. In first experiment, stress treatments were imposed as 100, 80, 60 and 40% field capacity (FC) at panicle initiation, booting and flowering stages and discontinued after completion of respective stage. The water stress treatments were maintained by adding water to the assigned pots with the help of well precision weighting balance at two days’ interval. At maturity, data on plant height (cm), number of panicle hill^-1, panicle length (cm), number of grains panicle^-1, 1000-grain weight (g), grain yield hill^-1 (g), total dry matter hill^-1 (g) and harvest index (%) were recorded. The second experiment for grain growth studies was consisted of the above four soil moisture levels and five rice genotypes. Dry matters of 10 grains were collected from fertilization to 24 days at 3 days’ interval. The two experiments were conducted in Randomized Complete Block Design (RCBD) with three replications. The collected data were analyzed statistically following the design with the help of MSTAT Computer packages (Russell 1986). The mean differences were compared by Duncan’s Multiples Range Test (DMRT) at 5% level of significance.

Source of Information: Int. J. Sustain. Crop Prod. 10(2): 44-47 (May 2015)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the above study it may be concluded that the water stress affected more or less at every growth stage causing a reduction of yield components and yield. However, different genotypes and growth stages had different degrees of reduction. The genotypes Ukunimadhu may be used as developing suitable variety for drought prone areas of Bangladesh because it showed the best performance under water stress condition among the studied genotypes.

Knowledge Management: Journal