The Working Capital and other formulae for the Yield Regulation in Selection Forests

Abstract

In this paper workability of Brandis's and Smythie's formulae for yield regulation in selection forests has been reviewed. A new formula with more universal application and able to deal with more diverse types of crops has been evolved. It has been shown that smooth working in the selection forest depends much more on the working capital in shape of class I trees rather than the rates of recruitment to class I from different classes. A formula to find out working capital has also been given. Till now the period of the felling cycle was fixed just by giving a few reasons of convenience in working of the forest for long or short period or in relation to number of girth classes, but it has been shown that long felling cycle may not be possible in view of the existing depleted stock in some forests unless at the cost of reduction in maximum permissible yield. A formula for finding out the longest possible felling cycle with the calculated muimum yield has also been given.