Formulas:

Kcal yield for year = (Calories per day per square meter) multiplied by (number of days in growing season).
 
 

 Latitude

 Maximum Kcal for plants per square meter per 24 hour day

 Biome

 Growing Season

 Maximum possible per square meter per year
 0 Equator

 6000 (average)
 

 365 days

 2,200,000 kcal
 30 Degrees

5200 (average)
     
 60 Degrees

 4800 (midsummer)
3000 (average)
731 (midwinter)

  Tundra times
1000
???

 42 - 70 days

 84,000 - 140,000
kcal


 

 70 Degrees

4100 (midsummer)
0 (midwinter)
 80 Degrees

3300 (midsummer)
0 (midwinter)
   At and below a possible 120, earth 
photosynthesis is very difficult. This 
is true in all zones where plants cannot
get enough light.

Special Cases