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Potential of intercropping soybeans (Glycine max (L.) Merrill) and cowpea (Vigna unguiculata L. Walp) with sunflower (Helianthus annuus L.) in the transition zone of south west Nigeria

Authors:

V. I. O. Olowe ,

University of Agriculture, P.M.B 2240, Abeokuta, Ogun State, NG
About V. I. O.
Research and Development Centre (RESDEC)
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J. A. Ajayi,

University of Agriculture, P.M.B 2240, Abeokuta, Ogun State, NG
About J. A.
Department of Plant Physiology and Production
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A. S. Ogunbayo

University of Agriculture, P.M.B 2240, Abeokuta, Ogun State, NG
About A. S.
Department of Plant Physiology and Production
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Abstract

Field trials were conducted at the Teaching and Research Farm of University of Agri-culture, Abeokuta (7o 15´ N, 3o 25´ E, altitude 144 m above sea level) located in the for-est – savanna transition zone of south west Nigeria, to assess the agronomic and eco-nomic potentials of intercropping soybeans and cowpea with sunflower at three growth stages (simultaneously (SS) at planting, tenth true leaf stage, V10 and eighteenth true leaf stage, V18) in 2002 and 2003. Land use advantage in terms of land equivalent ratio (LER>1.00) ranged between 1.04 – 1.40 in 2002 and 1.05 – 1.24 in 2003 for the inter-cropping systems, whilst marginal intercrop compatibility in terms of land equivalent coefficient (LEC>0.25) ranged between 0.29 – 0.48 for sunflower/soybeans SS, at V10 and V18 in 2002 and sunflower/cowpea SS in 2003. These identified agronomic advan-tages did not guarantee substantial economic efficiency in terms of monetary equiva-lent ratio (MER>1.00) for some of the intercropping systems with LER>1.00 and LEC>0.25. Sunflower/cowpea SS in 2002 and sunflower/soybean V10 in 2003 recorded small monetary advantage over the most productive sole crop with MER=1.12 and 1.04 and sunflower yield equivalent (1349.2 and 1421.6 kg ha-1), respectively.

How to Cite: Olowe, V.I.O., Ajayi, J.A. and Ogunbayo, A.S., 2009. Potential of intercropping soybeans (Glycine max (L.) Merrill) and cowpea (Vigna unguiculata L. Walp) with sunflower (Helianthus annuus L.) in the transition zone of south west Nigeria. Tropical Agricultural Research and Extension, 9, pp.91–102. DOI: http://doi.org/10.4038/tare.v9i0.5409
Published on 30 Dec 2009.
Peer Reviewed

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