An Maarif, Mohammad Syamsul creator Clarke Harry R. Chairperson Oudheusden, Dirk L. van Examination Committee Vrat, Prem Examination Committee Sauter-Servaes, Florian Examination Committee US - ASEAN Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1985 continuing eng 62 p. The problem of rubber plantation management is formulated as a problem in control theory . The production of rubber trees depend on intra-rotation activities (maintenance ), stocking density, and the age of rubber trees. Th e objective of t h is study is to maximize the present value of all the future net profits over a class of in finite chain of rotation where each link in the cha in represents a uniform length rotation with identical intra-rotation activities. The optimal control is determined by applying the Pontryagin's Maximum Principle. Since data on effects of maintenance to the production is difficult to get, qualitative analysis is used in applying the control model . By using present value comparisons , the optimal rotation time T, stocking density So , and the age of restocked trees To are determined. The optimal tapping system is also determined by choosing the most profit able tapping system. A research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 1985 Rubber plants Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B19885 http://203.159.5.9/ait-thesis/detail.php?q=B19885 121095 20260817162846.0