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Nodal Position Effect on Reproductive Efficiency and Seed Yield in Four Mustard Varieties

M. S. A. Fakir
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

M. Khatun
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

A. Islam
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

M. N. Uddin
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

A field experiment was carried out with four varieties of mustard and rapeseed belonging to Brassica campestris and B. juncea species to investigate siliqua and seed yield plant^-1 and to determine flower production, reproductive efficiency (RE) and seed yield at different nodal position of the mainstem and branches. Result revealed that variation existed in siliqua and seed yield plant^-1, and reproductive efficiency (RE, percent fruit set to flower) between the varieties and species. It was further observed that RE, siliqua and seed yield node^-1 decreased with the progression of nodal position from proximal (basal) towards distal (top) part of the raceme. The results concluded that variety with fewer nodes and more siliqua at proximal position of racemes may be a good indicator for higher seed yield.

Keywords: Mustard / rapeseed, siliqua set, nodal siliqua and seed weight

Location: Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

Start Date: 00-11-2003

End Date: 00-02-2004

Program Area: Variety and Species

Commodity: Mustard

Objectives:

To determine flower production, reproductive efficiency (RE) and seed yield at different nodal position of the mainstem and branches.

Methodology:

Four varieties of mustard and rapeseed were collected from Bangladesh Agricultural University (BAU), Bangladesh Agricultural Research Institute (BARI) and Bangladesh Institute of Nuclear Agriculture (BINA) belonging to Brassica campestris and B. juncea species. Field experiment was conducted on a silty clay loam textured soil having pH value 7.3 at the field laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh during the period between November 2003 and February 2003. The experiment was laid in a Randomized Complete Block Design (RCBD) with three replications. The size of unit plot was 2 m²(2 m x 1 m). The plot to plot distance was 0.5 m and block to block distance was 0.8 m. The line to line distance was 20 cm. Seeds were sown in line and was thinned at 10 and 18 days after emergence maintaining a distance of about 10 cm between plants. The experimental area was fertilized @ 250 kg urea ha^-1, 160 kg TSP ha^-1, 80 kg MP ha^-1and 180 kg gypsum ha^-1. Urea was applied in two installments; half at final land preparation and the rest were top dressed before flowering. The field was irrigated twice, at 24 DAE (days after emergence) and 50 DAE. The date of harvest was determined when 80-85% of the siliqua became brown colour. The maturity dates were different among the varieties. The plants were harvested plot wise at maturity and were brought to the threshing floor for drying in the sun. The seeds were threshed out by mild pounding with stick. The data on flower production, siliqua and seed size and seed yield plant^-1were recorded during harvest. At maturity, five plants were selected randomly from each plot and morphological and yield contributing characters were recorded at individual node separately in mainstem and branches. Total reproductive unit (TRU) or total number potential flowers, hence, fruit was estimated as follows. TRU= Number of flower buds + number of opened flowers + number of matured and immatured siliquae + number of empty pedicels. Reproductive efficiency (RE) or percent siliqua-set was the ratio of mature siliqua to TRU. The collected data were compiled and analyzed statistically using MSTAT-C programme to find out the statistical significance of the experimental results. Duncans New Multiple Range Test (DMRT) was performed for ranking the mean values for different characters of the tested varieties according to Gomez and Gomez.

Source of Information: Bangladesh J. Seed Sci. & Tech. 16 (1 &2): 67-73 (2012), ISSN 1029 - 8800

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Result revealed that variation existed in siliqua and seed yield plant^-1, and reproductive efficiency (RE, percent fruit set to flower) between the varieties and species. It was further observed that RE, siliqua and seed yield node^-1 decreased with the progression of nodal position from proximal (basal) towards distal (top) part of the raceme. The results concluded that variety with fewer nodes and more siliqua at proximal position of racemes may be a good indicator for higher seed yield.

Knowledge Management: Journal