**Here, you have the option to change the number of plants per hectare,
n, and your assumptions concerning many other things of importance. You
instantly get the present value per hectare.**
**The variables and parameters are:**

**F = Fix cost per hectare at the time of the investment (site preparation
etc.).**
**c = Cost per plant (the price per plant when you buy them + the
cost of the plantation activity).**
**n = The number of plants per hectare.**
**x = The probability that a plant survives.**
**r = The rate of interest in continuous time.**
**t = The number of years until it the harvest takes place.**
**p = Net price per cubic metre when it is time to harvest.**
**v = The average volume production per hectare and year during the
life of the trees in the**
** age interval [0 - t] in case the
number of surviving stems is 2000 per hectare.**
**L = Land value per hectare after the harvest.**
**U = Relative production ( = The real production divided by the production
which would take place**
** with 2000 surviving stems per
hectare).**
**VOL = The harvest volume, cubic metres, per hectare.**
**nsurv = The number of surviving stems per hectare.**
**MVOL = The average volume per stem when it is time to harvest.**
**Present Value = - F - c*n + EXP(-rt)(p*VOL
+ L)**

**
Good Luck!**

**
Peter Lohmnader**

**Background and References:**

See this link and the included references: *http://www.sekon.SLU.se/~plo/svepl5.html*