Evaluation of cowpea lines in Nigerian cropping systems

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" Evaluation of cowpea lines in Nigerian cropping systems "
S. F. Blade

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1112642
Doc. No	:	TLpq89200394
Main Entry	:	S. F. Blade
Title & Author	:	Evaluation of cowpea lines in Nigerian cropping systems\ S. F. Blade
College	:	McGill University (Canada)
Date	:	1991
student score	:	1991
Degree	:	Ph.D.
Page No	:	220
Abstract	:	The primary hypothesis of this research was that improved cowpea genotypes (selected under sole crop) could yield well in several Nigerian cropping systems, and that there were cowpea characteristics that improved overall system productivity. Cowpea lines were identified which were high yielding and stable in several management systems. Practices such as not applying insecticide and intercropping both reduced cowpea grain yield significantly. Land equivalent ratios were greater than one for all tested intercrop systems: cassava-cowpea (1.21-2.35), maize-cowpea (1.31-4.23), maize-cassava-cowpea (1.63-3.40) and millet-cowpea (1.13-6.88). Nitrogen nutrition of component crops was investigated. Line influenced both maize grain (12.5-28.4 kg ha-1) and total biomass (48.7-69.0 kg ha-1) nitrogen yield. Evidence from pot and field experiments (including N-dilution studies) indicated same-season nitrogen transfer. Light interception studies also indicated the increased light harvesting ability of early sole cowpea lines compared to early intercropped lines systems.
Subject	:	Biological sciences
	:	Plant propagation