By substituting threshold G* by 0.4 in the linear regressions
of G* versus STh1 (Eqs. (1)–(4)), we can obtain a STh1
prediction of the best fruit quality according to the season. The
best fruit quality in the winter season could be obtained with
STh1 = 300 and 700 8C day1 in perlite and NFT cultures,
respectively; in the spring season these values could be
250 8C day1 in perlite and 125 8C day1 in NFT