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Effect of Planting Date on Morphological Characters and Biomass Production in Indigofera Tinctoria

G. M. M. J. Rahman
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

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

M. G. Mostafa
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

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

Abstract/ Executive Summary:

An experiment was conducted at the Botanical Garden, Bangladesh Agricultural University, Mymensingh, during March, 2006 to April, 2007 to evaluate the effect of date of planting on some canopy characters and biomass yield in Indigo (Indigofera tinctoria). Seeds were sown at seven planting dates (March, May, June, July, August, September and October) and harvested at 180 days after sowing (DAS). Results revealed that stem height, stem base diameter, number of branches, leaf number, leaf area, leaf fresh weight; dry weight of root, leaf, main stem, rachis and branches; total fresh and dry mass yield were significantly increased between March and May planting compared to other planting dates. It may be concluded that March and May planting may be better for higher leaf and total dry mass yield in Indigofera tinctoria at 180 DAS.

Keywords: Sowing date, Canopy, Biomass yield, Indigo

Location: Botanical Garden, Bangladesh Agricultural University, Mymensingh

Start Date: 00-03-2006

End Date: 00-04-2007

Program Area: Crop-Soil-Water Management

Commodity: Indigo

Objectives:

1. To investigate the effect of sowing dates on morphological characters and biomass production in I. tinctoria.

Methodology:

The experiment was conducted at the Botanical garden, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh, during March, 2006 to April, 2007. Geographically the experimental field is located at 24° 75/ N latitude and 90° 50/ E longitude at the elevation on 18 m above the sea level. The experimental field was medium high land belonging to the sonatola soil series of gray flood plain soil type under the agro-¬ecological zone of Old Brahmaputra Plain (AEZ-9). The soil was silty loam, imperfectly poor drain with slow permeability. The climatic condition of the experimental site is sub-tropical and characterized by high temperature (32.45⁰C) and high humidity (88.63 %), heavy rainfall (413.2 mm) during kharif season (April to September) and scanty rainfall (0.2 mm) associated with moderately low temperature (10.80⁰C) during the Robi season (October to March). Seven treatments (sowing dates) were laid out following randomised complete block design (RCBD) with three replications. The seven sowing dates were 1st sowing (mid-March), 2nd sowing (mid-May), 3rd sowing (mid-June), 4th sowing (mid-July), 5th sowing (mid-August), 6th sowing (mid-September) and 7th sowing (mid-October). Seeds were also sown in mid-April but seed did not germinate and hence was excluded from the experiment. The experimental plots were divided into three blocks each representing a replication. Each block was then divided into seven unit plots (120 cm x 180 cm) with plant spacing was 30 cm x 30 cm. Block to block and plot to plot distance was 75 cm and 50 cm, respectively. Five plants were harvested from each plot at 60, 120 and 180 days after sowing (DAS). The following data were recorded: stem height (cm), stem base diameter at 10 cm from base (d₁₀), primary branch number/ plant, total number of branches/plant, leaf number/plant, leaf area/plant (cm²), leaf fresh and dry weight (g); dry weight (g) of branch, main stem, rachis, root and pod (g); total fresh weight (g), and total dry matter (TDM) (g). Total dry mass of separated plant parts was obtained by summing and weighing of dried weight of samples in an electric balance after at 80 ± 20 C for 48 hours. The data were compiled and analysed following RCBD to find out the statistical significance of the experimental results. The means for all recorded data were calculated and the analyses of variance for all the characters were performed. The mean differences were evaluated by Duncans New Multiple Range Test (DMRT). A correlation study of total biomass with different canopy characteristics was also carried out.

Source of Information: J. Agrofor. Environ. 2(1): 1-6, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results revealed that stem height, stem base diameter, number of branches, leaf number, leaf area, leaf fresh weight; dry weight of root, leaf, main stem, rachis and branches; total fresh and dry mass yield were significantly increased between March and May planting compared to other planting dates. It may be concluded that March and May planting may be better for higher leaf and total dry mass yield in Indigofera tinctoria at 180 DAS.

Knowledge Management: Journal