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Study of Source-sink Relationship in Field Crops

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:

An experiment was conducted at BINA farm, Mymensingh, during the period from February to May 2012 to investigate growth, morpho-physiological characters, yield attributes and seed yield in four soybean mutants viz., SBM-13, SBM-17, SBM-20 and SBM-22 along with a newly released variety, Binasoybean-1. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Results revealed that plant height, branch number, leaf area (LA), total dry matter (TDM), absolute growth rate (AGR), relative growth rate (RGR) and Net Assimilation Rate (NAR) differed significantly at all growth stages. LA and TDM increased with age till 80 and 90 DAS, respectively. The AGR increased till 80 days after sowing (DAS). The mutant SBM-20 showed the highest plant height, branch, TDM, LA and growth parameters like AGR and RGR at the latter growth stages and also produced the highest seed yield (2.84 tha^-1) whilst Binasoybean-1 showed the least plant height, branch number, LA and AGR and resulted lower seed yield. However, in general, higher dry matter partitioning to grain (higher) was observed in low yielding genotypes than the high yielding ones.

Keywords: Crop growth rate, Relative growth rate, Net assimilation rate, Yield attributes and Soybean

Location: BINA farm, Mymensingh

Start Date: 11-01-2012

End Date: 30-05-2012

Program Area: Crop-Soil-Water Management

Non-commodity: Performance

Objectives:

The objective of the project was to assess photosynthetic and translocation efficiency for better crop management and plant breeding applications

Methodology:

The experiment was conducted with 4 soybean mutants viz. SBM-13, SBM-17, SBM-20 and SBM-22 along with a check variety Binasoybean-1 at BINA farm, Mymensingh during the period from 11 January to 30 May 2012. The experiment was laid out in a Randomized Complete Block Design (RCBD) with 3 replications. The size of the unit plot was 3 m × 4 m. Distances between block to block and plot to plot were 1.0 and 0.5 meter, respectively. The seeds of five soybean genotypes were hand sown in rows on 11 January 2012. Plant protection measures were taken at 45 and 60 DAS against fruit and shoot borer by spraying Diapam 60 EC @ 0.25%. To study ontogenetic growth characteristics, a total of six harvests were made and at final harvest, data were collected from randomly selected 10 plants from each plot on some morpho-physiological parameters, yield attributes and yield. The first crop sampling was done for collecting data on growth parameter at 35 DAS and continued at an interval of 10 days up to 110 DAS i.e. till attaining physiological maturity. From each sampling, five plants were randomly selected from each plot and uprooted for collecting necessary parameters. The plants were separated into leaves, stems and roots and the corresponding dry weight were recorded after oven drying at 80 ± 2°C for 72 hours. The leaf area of each sample was measured by LICOR automatic leaf area meter (Model: LICOR 3000). The growth analyzing attribute like AGR, RGR and NAR were calculated using the formulae of Radford (1967). The collected data were analyzed statistically following the analysis of variance (ANOVA) technique and the mean differences were adjusted with Duncan’s Multiple Range Test (DMRT) using the statistical computer package program, MSTAT-C (Russell, 1986).

Source of Information: BINA Annual Report, 2011-12:page no. 73-76, Mymensingh

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Among the genotypes, SBM-20 produced the highest seed yield due to superiority of yield attributes than in the others. High yielding genotypes had taller plant, higher number of branches, LA, TDM and AGR which resulted in higher number of pods plant^-1 than the low yielding soybean genotypes.

Knowledge Management: Report/Proceedings