From the start of the de-greening process until the end of the fall,
a progressive increase in the a* coordinate and a decrease in the Hue
index were observed during the experiment, reaching their respective
maximum and minimum values in the month of December
(Figs. 2–4), which indicates that the lemon fruits had reached their
characteristic yellow color (Brotons et al., 2013). In Fig. 1, we can
see that the type of rootstock did not influence the final color of
the fruit, as a* and Hue were similar for both C. macrophylla and
Sour orange (4.76, 85.38). However, the cultivation strategy (out
in the open, shade screen, and mulching) and the irrigation treatment
(drought and salinity) did have an effect on the final color of
the fruits (Table 1).