Improving phenotypical skills of some useful forest species in dja reserve: Biofertilisers effect in nursery of local organic manure on the growing patterns of seedlings

Safety Nursery’s tree species often undergo specific sylvi cultural treatments, enabling them to develop their phenotypical skills in plantation. These multipurpose trees are used for reforestation, in situ conservation of forest stands and marking local ownership. Sprouts come from local sources and put in nursery at Minko in the Southwest edge of the Dja Reserve. In order to assess the contribution of local organic manure on the growing patterns of forest seedlings, we have introduced an organic amendment into the substrate of polyethylene containers. Thus, chicken droppings, cow dung and, IMO Bokashi, which is a biological fertilizer made of cereal’s bran and indigenous microorganisms. It’s known for its beneficial action on potatoes in North-West Cameroon, and they have been applied in different doses. The parameters observed concern all phenological appeared during the 06 months of the trial, with specific interest on the height and leaf area index of plants. No depressive or toxic effects due to successive fertilizationweren’t observed. Baillonellatoxisperma Pierre, Garcinia kola Helkel, Guibourtiatessmannii (Harms) J.Léonard, Irvingiagabonensis (Aubry-Lecompte ex O'Rorke) and Trichoscyphaacuminata Engl.) are among the five species selected, which have been followed on a confounding design. The data’s analysis was made by the SAS 9.0 software version, using the generalised linear procedure and the Duncan test for the mean separation at 5% threshold (P ≤ 0.05). Results showed that cow dung on single doses and, in unbalanced fractions with chicken droppings gives more promising trends in terms of gain perspective in height and leaf area. The biofertilisers effect on height is highly significant (P ≤ 0.01) for Baillonellatoxisperma, Garcinia kola and Irvingiagabonensis(70.690 ± 50.722 cm). Meanwhile, the leaf area benefits is accentuated with a detectable effect for Baillonellatoxisperma, Trichoscyphaacuminata and Garcinia kola(73,167 ± 63,375 cm2). These results indicate that cow dung (Tb) improves the quality of the nursery substrate for seedlings. Moreover, the combination with chicken droppings (Td) accelerates apical growth of stem and, increase leaf area index of observed plants. An organic manure made at least, 40% of chicken manure associated with cow dung will be recommended to improve the soil characteristics in nursery for these five species.