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INFLUENCE OF SOWING DATE AND ENVIRONMENTAL FACTORS ON THE DEVELOPMENT AND YIELD OF BAMBARA GROUNDNUT (VIGNA SUBTERRANEA) LANDRACES IN A SUB-TROPICAL REGION

Published online by Cambridge University Press:  01 April 2008

A. SESAY ,
C. N. MAGAGULA  and
A. B. MANSUETUS
A. SESAY*
Affiliation:
Department of Biological Sciences, University of Swaziland, Private Bag 4 Kwaluseni, Swaziland
C. N. MAGAGULA
Affiliation:
Department of Biological Sciences, University of Swaziland, Private Bag 4 Kwaluseni, Swaziland
A. B. MANSUETUS
Affiliation:
Department of Biological Sciences, University of Swaziland, Private Bag 4 Kwaluseni, Swaziland
*
†Corresponding author.
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Summary

Bambara groundnut (Vigna subterranea) is a grain legume crop, which is increasingly popular as food in rural areas across the African continent. However, reliable information pertaining to management of the crop is limited. Field experiments were conducted in Swaziland in the 1998/99 and 1999/2000 cropping seasons to determine the influence of sowing date and environmental factors on the growth, development and yield of bambara groundnut. In the 1998/99 season, seeds of one local landrace were sown on six dates between mid-September 1998 and mid-February 1999. In 1999/2000, seeds of two local landraces were sown on six dates between mid-October 1999 and late January 2000. The highest pod yield and total dry matter production were achieved in November sowings, with maximum pod yields of 1.3 and 0.64 t ha−1 for the 1998/99 and 1999/2000 seasons, respectively. Earlier sowing and successive delays in sowing from November caused substantial yield declines of as much as 72–75%. Sowing date influenced yields of bambara groundnut through the effect of temperature and daylength on plant development. For the landraces used in the study, while the rate of progress from sowing to flowering was influenced by temperature, the rate of progress from flowering to podding was influenced largely by daylength. The practical implications of the results for increased bambara groundnut production are discussed.

Type
Research Article
Information
Experimental Agriculture , Volume 44 , Issue 2 , April 2008 , pp. 167 - 183
Copyright
Copyright © Cambridge University Press 2008

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