Working Document Series Open Access Preliminary compositional nutrient diagnosis for rubber tree in the humid forest zone of Cameroon E. Ehabe Ejolle · G. Elambo Nkeng · J. Njukeng Nkengafac · Ewalds. Schnug The main source of natural rubber is the rubber tree (Hevea brasiliensis), an important crop to the Cameroonian economy. In order to improve yields while maintaining tree sustainability, nutrient norms must be derived for proper nutrient a… RUF-34183 2014 CC BY 4.0 14 Aug 2015