Replication data for: Allanblackia floribunda: a new oil tree crop for africa: amenability to grafting

Three Allanblackia species (A. floribunda, A. stuhlmannii and A. parviflora) with high nutritive, medicinal, cosmetic and economic values are currently being domesticated as new oil tree crops. Allanblackia seeds contain a hard white fat consisting mostly of stearic (52 “58%) and oleic (39 “49%) acids. This unusual fatty acid content has the right properties for many different food and cosmetic products making them commercially interesting. Vegetative propagation studies on A. floribunda, which grows naturally in the moist forest of Cameroon and Nigeria, were initiated aimed at evaluating its amenability to grafting. Scions were grafted onto 18 month old rootstocks of A. floribunda using side tongue, top cleft, side veneer, whip-and-tongue methods under nursery conditions in Cameroon. In parallel, side tongue and inverted™ budding methods were also tested in situ on young A. floribunda wildings growing under semi-deciduous and evergreen tree covers. In addition, the effects of protecting side tongue new grafts with non perforated translucent plastic, perforated translucent plastic and aluminium foil were assessed. Under nursery conditions, side tongue grafts were significantly more successful (80.0 ± 6.3%), than grafts of side veneer (52.5 ± 7.9%), top cleft (55.0 ± 7.9%) and whip and tongue (50.0 ± 7.9%). The success of side tongue graft was further increased (86.7 ± 6.2%) under the shade of evergreen trees when protected by non perforated translucent plastic. These results indicate the potential for in situ grafting and top working to promote cultivation of more productive germplasm of Allanblackia within multifunctional agricultural systems.

Replication Data for: Towards an assessment of on-farm niches for improved forages in Sud-Kivu, DR Congo

Inadequate quantity and quality of livestock feed is a persistent constraint to productivity for mixed crop-livestock farming in eastern Democratic Republic of Congo. To assess on-farm niches of improved forages, demonstration trials and participatory on-farm research were conducted in four different sites. Forage legumes included Canavalia brasiliensis (CIAT 17009), Stylosanthes guianensis (CIAT 11995) and Desmodium uncinatum (cv. Silverleaf), while grasses were Guatemala grass (Tripsacum andersonii), Napier grass (Pennisetum purpureum) French Cameroon, and a local Napier line. Within the first six months, forage legumes adapted differently to the four sites with little differences among varieties, while forage grasses displayed higher variability in biomass production among varieties than among sites. Farmers’ ranking largely corresponded to herbage yield from the first cut, preferring Canavalia, Silverleaf desmodium and Napier French Cameroon. Choice of forages and integration into farming systems depended on land availability, soil erosion prevalence and livestock husbandry system. In erosion prone sites, 55–60%of farmers planted grasses on field edges and 16–30% as hedgerows for erosion control. 43% of farmers grew forages as intercrop with food crops such as maize and cassava, pointing to land scarcity. Only in the site with lower land pressure, 71% of farmers grew legumes as pure stand. When land tenure was not secured and livestock freely roaming, 75% of farmers preferred to grow annual forage legumes instead of perennial grasses. Future research should develop robust decision support for spatial and temporal integration of forage technologies into diverse smallholder cropping systems and agro-ecologies.

Influence of clone provenance, branch diameter and positioning on the rooting ability of Dacryodes edulis macot in sourthen Cameroon.

In the process of participatory domestication of agroforestry species, one of the objectives is the conservation of genotype of fruit trees commonly used by local people and the overpower of their reproductive system. For this, techniques of vegetative propagation (tissue culture, grafting, cuttings and air layering) are applied
to those species which include the safou (Dacryodes edulis “G. Don” HJ Lam.) (Burseraceae), which is a forest tree native to tropical and equatorial Africa. It plays an undeniable role in the lives of Farmers. In addition to its fruit eaten as a food supplement, its wood is used for heating and contribution of traditional medicine should not be overlooked. The objective of this work is to identify clones that are better suited for air layering and assess the effect of the diameter of the marcots on its ability to take root. To achieve these objectives, 12 clones and two diameter classes (2-3 cm and 3-5 cm) were tested in this trial conducted following a randomized complete block.

Biodiversity and complementary feeding practices of children in the north west region of Cameroon

Data from Northwest Region (rural) agro-ecological zone is Tropics lowland, warm Tree Crop farming system. West-African food composition table is used Stadlmayr B, et al. (2012) West-African Food Composition Table. (Rome), p 148. Species consumed were identified using ICRAF data for Cameroun and World Vegetable Centre, Yaoundé, Cameroon
Only mothers with children between 12-23 months were interviewed. Households were first visited to inform the mother/caregiver on the study background and objectives after which consent to participate was asked by reading out a consent form. Only upon agreement and subsequent signing of the form, an interview was conducted. The study was approved by ethics Clearance Committee, Yaoundé, Cameroon. Food and drink intake was assessed using a 2 day interview-administered 24-hour recall. Composition of food was obtained from FAO (2012). West African Food Composition Table, FAO, Rome, Italy and species were identified at World Vegetable Centre, Yaoundé, Cameroon