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Pigeonpea Production in the ‘ail’ of Rice Field: Ii. Effect of Date of Planting on Flower Shedding and Yield

M.S.A. Fakir
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-2202.

M.N. Islam
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-2202.

Abstract/ Executive Summary:

Four indeterminate short day pigeonpea Morphotypes (Bogra, Comilla, IPSA and Jamalpur) were grown in four different planting dates viz., May, June, September and November in the borders of rice field (Ail) to investigate pod maturity duration, reproductive abscission, raceme and pod production and their relationship with total dry mass and seed yield. Pod maturity duration, yield and yield attributes decreased markedly with delayed planting dates compared with normal planting, May. Further, increasing flower and raceme production and reduced floral abscission may be used as indexes for improved seed yield in pigeonpea.

Keywords: Sowing dates, Indeterminate, Cajanus cajan, Pod and seed yield

Location: Crop Botany Field laboratory, BAU, Mymensingh

Start Date: 00-05-2003

End Date: 31-12-2003

Program Area: Crop-Soil-Water Management

Commodity: Pigeonpea

Objectives:

The present research was, therefore, carried out to investigate the effect of dates of planting on (i) time to flowering and pod maturity; (ii) reproductive abscission and pod production; and (iii) the relationship of pod and seed yield with yield attributes in four long duration indeterminate pigeonpea Morphotypes grown in the ails of rice field.

Methodology:

Seeds of three long duration pigeonpea (LDP) Morphotypes were collected from Bogra, Jamalpur, Comilla and were used as ‘Bogra’, ‘Jamalpur’, and ‘Comilla’ Morphotype, respectively. One released variety from Bangabhudhu Sheik Mujibur Rahman Agriculture University (formerly institute of post graduate studies in Agriculture, IPSA) was named as ‘IPSA’. Seeds of four indeterminate pigeonpea Morphotypes/genotypes of LDP were planted in four dates, first week of each of May, September, July and December, 2003 in pits (50cm x 50cm x 30 cm) 50 cm apart in a line. There were ten plants of each Morphotype in a line in each planting date and constituted a plot. The sixteen treatments (4 Morphotypes x 4 planting dates) were laid out in a randomised bock design in three replicates. Three one hundred meter long 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 cow dung 1 kg, TSP 200g and 100g MP was applied in each pit at planting. Before planting, pits were dug and soils were exposed to sun seven days before sowing. Data on time required to 50% flowering, dry pod maturity (80% and above), number of racemes/plant, number of pods/plant, 100-seed mass and seed weight/plant was recorded. Abscission of reproductive structures (buds, flowers and young pods) was estimated. Abscission of reproductive structures would be named henceforth, Abscission, for clarity. Plant parts were oven dried at 80°C±2 2 for 48 hours and weighed to estimate total dry mass (TDM). A correlation study of pod, seed and TDM yield with yield attributes was also carried out.

Source of Information: J. Agrofor. Environ. 1(2): 1-5, 2007; ISSN 1995-6983

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Funding Source:

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Achievement/Findings:

Pod maturity duration, yield and yield attributes decreased markedly with delayed planting dates compared with normal planting, May. Further, increasing flower and raceme production and reduced floral abscission may be used as indexes for improved seed yield in pigeonpea.

Knowledge Management: Journal