Figure 3
From: Photo-selective shading screens as a cover for production of purple lettuce
Principal component analysis of variables associated with lettuce growth and physiology cultivated two planting seasons and in different photo-selective screens (black, control (full sun), silver and red). (1) Spring; (2) Autumn. TFM total fresh matter, TDM total dry matter, NL number of leaves, SD stem diameter, SL stem length, LA leaf area, SPAD chlorophyll index; nitrogen balance indexes (NBIG and NBIR), chlorophyll (SFRG and SFRR), flavonoids (FLAV) and anthocyanins (ANTHRG and ANTHRB).
