Calculation potential yield
Daily gross dry matter production
Daily gross dry matter production (P) of a standard crop with a closed leaf canopy can be calculated from the daily production on a clear day (Pc) and the daily production on an overcast day (Po). F = fraction of the day the sky is overcast
P = F . Po + ( 1 - F ) . Pc
DAILY PRODUCTION ON CLEAR DAY (Pc) AND SKY OVERCAST DAY (Po)
Net production
Net production is: gross assimilation minus respiration and reduction of gross assimilation by non-optimum temperatures combined in one factor K.
PNET = K . P .
Effect of temperature on nett production in relation to gross production
Light interception
Percentage of light intercepted=percentage of soil covered by green leaves
SOILCOVER
Harvest Index
Proportion of total dry matter used for tuber production. Harvest index = 0.80 (in temperate climates) - 0.75 (in warm climates).
Dry matter content
Dry matter content = 20%
EXAMPLE CALCULATION POTENTIAL YIELD=====
COMPARISON POTENTIAL YIELD AND ACTUAL YIELD
CALCULATOR POTENTIAL YIELD