USING QUANTITATIVE APPROACHES FOR DETERMINATION THE OPTIMUM ECONOMIC ROTATION OF PLATANUS ORIENTALIS L. ARTIFICIAL STANDS IN NENAVAH FOREST
Mesopotamia Journal of Agriculture,
2012, Volume 40, Issue 0, Pages 134-141
In this aspect two main methods were used; the first is an administrative one represented by determining the optimum economic cutting rotation for Platanus in artificial stands in Ninevah, and the relation was represented mathematically and graphically by using a method depends on the current annual increment and the mean annual increment.The cutting rotation of Platanus 13 years. At the same time the economic method was used and represented by the separate mathematical model to determine the optimum economic cutting rotation of the same type of trees. In comparison between these methods and the first method the results showed the optimum cutting rotation for the three models are(10) years. at the same time the equation of net present value was used and by making discount on the data information that is concerned with the studied costs, incomes and stands, and they all showed the following best rotations of cutting:
(10) years at 5% discount rate. (10) years at 10% discount rate.
(9) years at 15% discount rate. (9) years at 20% discount rate.
(9) years at 25% discount rate. (9) years at 30% discount rate.
Through the comparisons between the cutting rotations we notice that there is a convergence between using the three mathematical models in determining the optimum economic cutting rotation, and there were relative differences between using the other methods that are used in this study.
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