ADIGBO S.O.
Abstract
The inland valleys have the potential of growing three crops in sequence within a year without supplemental
irrigation. The effects of preceding lowland rice (Oryza sativa L.) and upland rice on the performance of vegetables
and cowpea (Vigna unguiculata L.) Walp grown in lowland rice-upland rice-vegetables/cowpea sequences was
investigated. Field experiments were conducted at the University of Agriculture Abeokuta, Nigeria in 2000-2003; to
determine the agronomic and economic performance of vegetables and cowpea in lowland rice-upland riceamaranth
(Amaranthus cruentus) lowland rice-upland rice-okra (Abelmoschus esculentus L.) sequences. The first,
second and third crops in all the cropping cycles were planted in May, September and January, respectively. The
yields of cowpea and okra in the inland valley were comparable to those of upland ecology. Amaranth appeared to
be a better utilize of residual fertilizer of the preceding upland rice than cowpea and okra. The depth of
groundwater table ranges between 45 and 72 cm. Thus, preceding lowland and upland rice influenced leafy
vegetable.
Key words:
amaranth, cowpea, inland valley, okra, rice, sequence