If we compare Kc values for the two species during the various
growth stages and for both years, it is clear that the greatest
differences were found during crop development and mid-season
stages, coinciding with the maximum ETc
values. If we take a closer
look at the average 10-day Kc values of the two species for each of
the test years, we see that Kc varies monthly, and highest
values, for both years, were found during the summer months,
when the plants had the highest vegetative growth, and lowest
values were found during the autumn months, during aboveground biomass senescence stages. In terms of percentage, it is
worth noting that the greatest increase in Kc values was recorded
during crop development, when the growth rate of the two species
was greater than the other stages. Regression analysis of the
average 10-day Kc values for A. donax and C. alternifolius in