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Pigeonpea Production in the ‘ail’ of Rice Field: I. Effect of Time of Planting on Canopy Structure and Biomass Yield

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

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

Abstract/ Executive Summary:

Four morphotypes of long duration pigeonpeas (Cajanus cajan) were grown in the ‘Ails’ of rice field between May (normal planting time), July, September and November (very late planting) to investigate morphological features and dry mass production. Results revealed that irrespective of morphotypes plant height, stem thickness, number of primary branches and dry mass plant-1 were 351.5 cm, 4.2 cm, 27.8 and 2312 g, respectively in May planting and that were corresponding to 63.3 cm, 0.9 cm, 10.3 and 97.6 g, respectively in November planting. Incase of planting time, components of canopy structures (plant height, stem base diameter, number of branches) and biomass production were greater in ‘Bogra’ and ‘IPSA’ morphotypes than in the ‘Comilla’ and ‘Jamalpur’. Results further revealed that canopy became shorter and smaller and consequently produced smaller biomass with progressive delay in planting due to short day effect. The consequences of late planting in respect of fuel crisis in Bangladesh is also discussed. Generally, long duration pigeonpea planted in May produced larger canopy with increased biomass yield especially the degree being more pronounced in Bogra morphotypes.

Keywords: Cajanus cajan, Sowing time, Morphology, Dry mass

Location: Rice fields in the Crop Botany Field laboratory, BAU, Mymensingh

Start Date: 00-07-2003

End Date: 00-12-2003

Program Area: Crop-Soil-Water Management

Commodity: Pigeonpea

Objectives:

1. To investigate the effect of planting time on canopy structure, biomass yield and their relationship in four long duration pigeonpea morphotypes.

Methodology:

Seeds of traditional three long duration pigeonpea (LDP) were collected from Bogra, Jamalpur, Comilla which were named as ‘Bogra’, ‘Jamalpur’, and ‘Comilla’ morphotypes, respectively. One released variety from Bangabandhu Sheik Mujibur Rahman Agriculture University (formerly Institute of Post Graduate Studies in Agriculture, IPSA) was used as ‘IPSA’. Seeds of four morphotypes/ variety of LDP were planted in four times, each in first week of May, September, July and December, 2003 in pits (50 × 50 × 30 cm) 50 cm apart in a line. There were ten plants of each morphotype in a line in each planting and constituted a plot. The sixteen treatments (4 morphotypes × 4 planting times) were laid out in a randomised bock design in three replicates. Three 100 m long wide borders, ‘Ails’ (1 m breadth by 1 m height) of rice fields in the Crop Botany Field laboratory were used as three replicates. The ‘Ails’ remained unwaterlogged during rainy season. A basal dose of cowdung 1 kg, TSP 200g and MP 100g was applied in each pit at planting. Before planting, pits were dug and soils were exposed to sun seven days ahead of sowing. The plants were harvested at 70-80% dry pod maturity between 15 and 30 April, 2004. Data on canopy structure namely plant height, stem diameter at d10 (10 cm from ground), number of primary and secondary branches, canopy spread (mean diameter of canopy) and biomass (fresh and dry weight of plant parts) were recorded. Plant parts were oven dried at 800C ± 2 for 48 hours and weighed. A correlation study between morphological features and dry mass yield was also carried out.

Source of Information: J. Agrofor. Environ. 1(1): 2007; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

These results revealed that planting long duration pigeonpea (LDP) in the Ail of rice field produced high biomass when planted in normal time, April/May.

Knowledge Management: Journal