A search is made for a sound replanting technique for oil palm plantations in the former Belgian Congo, by analysing the influences of the old stand and those of fertilizers on the development of young palms in replanted areas. The advantages of replanting over opening up of new areas are diminished by the greater chance of nutrient deficiency and other diseases. The benefits of retaining the old stand for a certain period of time are greatly reduced by the mortality of the young palms, their poor and slow vegetative development, their greater susceptibility to pests and diseases, the retarded beginning of their productive stage and the slow increase in production. The benefits of fertilizers for the young palms became evident during the second year after planting, but are slightly reduced as long as the old stand is retained.There is a discussion of the effects of N, P, K, Mg, Ca, Cu, Mn, B, Zn, Ni, Co, and Mb in replanting experiments on a riverine sandy soil and a red latosol, especially their effects on chemical composition of leaves, number of male and female inflorescenses and fruit bunches. Various valuable improvements are advised in seed bed and nursery technique.
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