den Doop, J. E. A2015-08-172015-08-17January 19don Doop, J. E. A. (1940). The utilization of sisal waste in Java and Sumatra-Part V. East African Agricultural And Forestry Journal. 5 (5), 312-320. https://www.cabidigitallibrary.org/doi/full/10.5555/194019010970012-8325https://kalroerepository.kalro.org/handle/0/9977In Parts III and IV of this series of articles the complete exhaustion history of the red soil of Soekamandi estate has been discussed. It was shown that the order of exhaustion of the three chief plant-food substances in this soil is: potassium, phosphorus, nitrogen. Furthermore, it appeared that if this soil is completely exhausted as regards potassium by sisal growing, soil phosphorus becomes unavailable as the result of exhaustion of decomposable organic matter in the soil.enhttp://creativecommons.org/licenses/by/3.0/Journal ContributionUtilizationSumatraSoilDecompositionhttps://www.cabidigitallibrary.org/doi/full/10.5555/19401901097