Yield, biomass, residues and stresses in hru_pw_*.txt

[kieungocle]

Bioms is defined as the average total plant biomass during timestep, it should be the total yield, all the above and below-ground biomass but it does not appear so.
Residue is defined as the average surface residue cover during timestep, however it does not decompose daily but remains the same if there is not any till, harvest or changing to a new year. Residue outputs from the hru_pw_day.txt show that it drops to 70% when there is TILL activity, a large number at harvest, and drop to 80% if jumping from December 31 to January 1 of the following year.
The summary relationship of the hru_pw_.txt files as below, calculating monthly form daily file and yearly from monthly file:
• Yield is the yield at the date of harvest in all the hru_pw_.txt
• The monthly biomass, residue, soil temperature in hru_pw_mon.txt is the average of daily hru_pw_day.txt.
• Yearly biomass is always higher than the average from hru_pw_mon.txt.
• Yearly residue can be larger or smaller than the average from hru_pw_mon.txt.
• hru_pw_aa.txt is the average of all the hru_pw_yr.txt with a slight difference in the hru_pw_yr.txt.
• All stresses (water, air, temperature, nitrogen, phosphorus) are summation: monthly stresses are the sum of daily stresses, and yearly is the sum of monthly.

[odav]

Kieu, please check out the latest pre-release to see if this is still an issue.