net photosynthesis

[fluktuacia]

how can i calculate the net photosynthesis of a plant when the asimilating area of its leaves is 1.671x10^-3m^2, volume of system is 345x10^-6m^2 (closed system).. and i have information about some measurings:
length of interval (s) : 350|150|100|100|150|350|
decrease in CO2 concentration (mmmol/m^3): 22.8| 7.2|2.8| 1.3| 0.8| 0.4|
(imagine its a table:P)
.... i was looking for some equations, but what i've found was not suitable... thx a lot

[Linn]

maybe you can find it here???

I believe there is a formula manual

http://www.licor.com/env/Support/discon ... li6200.jsp