The oil palm (Elaeis guineensis Jacq): nature’s ecological endowment to eastern Nigeria

The paper highlights oil palm as a multipurpose tree crop symbolizing nature’s endowment to the people of South East, Nigeria, and presents available evidence that the center of origin for the palm is within the area. The structure of the natural habitat of the oil palm – the groves, from where several genetic collections have been made for the improvement of the crop worldwide – is described. The oil palm is viewed as closely interwoven with the people providing their requirements in terms of food, medicine and materials for infrastructural development. In a wider context, the ecological, socio-economic, and socio-cultural and traditional values of the palm are discussed. The history of efforts to exploit the potentials of the crop through domestication and genetic improvement is given. Because the potential of oil palm is yet exhausted, the action plan for further development in the natural habitat and plantations is also given, highlighting the prospects of increased oil palm production as well as some of the constraints on the way to realising this all-important project. The paper identifies areas needing action research towards the sustainable development of oil palm. Among other suggestions in this direction, the paper recommends the creation of a center of excellence in oil palm studies within the South East, Nigeria to expand the scientific exploitation of the natural groves and encourage plantation establishment for the benefit of not only the people whose God-given gift is now a highly valuable crop in the world, but the entire country and even beyond.Keywords: multipurpose tree, natural groves, oil palm plantations, agricultural growth, South East Nigeri

Manurial amendments and source of water for supplemental irrigation of sawah-rice system influenced soil quality and rice yield

Soil and water management research on adapting the promising sawah ecotechnology for lowland rice farming in West Africa has largely focused on the abundant inland valleys; floodplains which too represent a huge agricultural resource in the region have not been so involved. Sawah refers to a bunded, puddled and leveled basin for rice, with water inlets and outlets for irrigation and drainage, respectively. In conventional sawah, soil fertility is augmented using mineral fertilizers, with an option to harness lowland water resources for use in small-scale irrigation to create the so-called sawah typologies. In this study, we evaluated the effects of three manurial amendments (rice husk, rice-husk ash and poultry droppings, each at 10 t ha–1) and NPK 20:10:10 at 400 kg ha–1 interacting with source of water (spring or pond) used for supplemental irrigation of three sawah typologies in a floodplain in southeastern Nigeria. Plots amended with poultry droppings and supplemented with spring water recorded the overall best performance of the sawah-rice system; the control being the unamended non-supplemented (solely rainfed) plots recorded the worst. Rice-husk ash and rice husk enhanced soil pH and soil organic carbon, respectively. The three sawah typologies showed a consistent trend thus spring-supplemented ≥ pond-supplemented ≥ non-supplemented sawah. Rice grain yield was influenced by soil total nitrogen and the sum of the three plant-nutrient basic cations (K+ , Ca2+ and Mg2+), with the influence of K+ alone being the greatest. To enhance rice performance including grain yields in floodplain sawah, farmers should utilise poultry droppings as soil manure and spring water for supplemental irrigation