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Table 2

Physiological variables and SPAD units in a polyculture of tomatoes, cucumbers, and lettuce under three production systems: soil (SPS), open (OPS), and closed (CPS)

Production systemPlant height (cm)
Stem diameter (mm)
SPAD units
TomatoCucumberLettuceTomatoCucumberLettuceTomatoCucumberLettuce
SPS 451.18 ± 18.33 a 279.89 ± 25.45 a 18.84 ± 0.97 b 7.95 ± 0.61 a 5.02 ± 0.14 a 27.81 ± 1.86 a 53.62 ± 1.30 a 48.67 ± 0.85 a 35.96 ± 1.60 a 
OPS 424.31 ± 8.08 b 270.13 ± 19.39 a 22.04 ± 0.69 a 6.07 ± 0.23 b 4.98 ± 0.31 a 23.56 ± 2.18 b 54.75 ± 0.84 a 47.12 ± 0.40 a 33.58 ± 1.80 a 
CPS 421.28 ± 10.46 b 280.94 ± 24.01 a 20.62 ± 0.67 a 6.18 ± 0.32 b 4.84 ± 0.18 a 22.50 ± 1.10 b 54.48 ± 1.04 a 46.80 ± 1.72 a 34.53 ± 1.09 a 
Production systemPlant height (cm)
Stem diameter (mm)
SPAD units
TomatoCucumberLettuceTomatoCucumberLettuceTomatoCucumberLettuce
SPS 451.18 ± 18.33 a 279.89 ± 25.45 a 18.84 ± 0.97 b 7.95 ± 0.61 a 5.02 ± 0.14 a 27.81 ± 1.86 a 53.62 ± 1.30 a 48.67 ± 0.85 a 35.96 ± 1.60 a 
OPS 424.31 ± 8.08 b 270.13 ± 19.39 a 22.04 ± 0.69 a 6.07 ± 0.23 b 4.98 ± 0.31 a 23.56 ± 2.18 b 54.75 ± 0.84 a 47.12 ± 0.40 a 33.58 ± 1.80 a 
CPS 421.28 ± 10.46 b 280.94 ± 24.01 a 20.62 ± 0.67 a 6.18 ± 0.32 b 4.84 ± 0.18 a 22.50 ± 1.10 b 54.48 ± 1.04 a 46.80 ± 1.72 a 34.53 ± 1.09 a 

The data represent the mean ± standard error (n = 12). Different letters within a column indicate significant differences (p < 0.05).

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