Table 3 Results of agronomic and physiological not destructive surveys at harvest.

From: Protein hydrolysates derived from residual after polysaccharide extraction of Chlorella vulgaris biomass improves yield and quality of baby leaf lettuce

Treatments

T1

T2

T3

T4

T5

T6

Plant Height, cm

14.00 ± 1.27

 

13.43 ± 0.58

 

12.53 ± 0.93

 

13.30 ± 1.93

 

12.47 ± 2.23

 

15.50 ± 1.98

 

TDR, % soil water content

30.50 ± 4.26

bc

28.83 ± 1.98

bc

30.80 ± 1.57

bc

25.25 ± 2.05

c

36.57 ± 1.10

a

33.23 ± 4.22

ab

Number of Leaves, no. pot-1

29.00 ± 5.66

ab

25.67 ± 1.53

b

30.00 ± 4.00

ab

23.33 ± 3.06

b

26.67 ± 0.58

b

35.00 ± 5.00

a

ChlM

0.05

± 0.01

b

0.08 ± 0.02

a

0.06 ± 0.01

ab

0.09 ± 0.01

a

0.08 ± 0.02

a

0.09 ± 0.02

a

FlvM

-0.19

± 0.01

c

-0.11 ± 0.06

b

-0.07 ± 0.02

ab

-0.10 ± 0.01

b

-0.09 ± 0.00

ab

-0.04 ± 0.00

a

AnthM

-0.18 ± 0.01

b

-0.15 ± 0.01

a

-0.16 ± 0.01

ab

-0.16 ± 0.02

ab

-0.15 ± 0.01

a

-0.18 ± 0.01

b

NFI

-0.24

± 0.04

a

-1.36 ± 0.00

c

-0.50 ± 0.34

ab

-0.93 ± 0.11

bc

-0.98 ± 0.37

bc

-0.47 ± 0.19

ab

Canopy Temperature, °C

19.50 ± 0.53

a

18.00 ± 0.10

b

17.83 ± 0.46

b

18.53 ± 0.47

b

18.13 ± 0.67

b

19.80 ± 0.40

a

Stomatal Conductance, mmol H2O m− 2 s− 1

38.30 ± 8.08

d

49.30 ± 1.53

d

52.00 ± 4.36

d

353.30 ± 15.28

a

102.30 ± 5.03

c

177.00 ± 7.94

b

NDVI

0.71 ± 0.02

 

0.71 ± 0.07

 

0.74 ± 0.00

 

0.72 ± 0.07

 

0.77 ± 0.02

 

0.74 ± 0.05

 

PRI

-0.74 ± 0.12

 

-0.75 ± 0.02

 

-0.70 ± 0.06

 

-0.72 ± 0.08

 

-0.66 ± 0.06

 

-0.68 ± 0.05

 
  1. T1: control; T2: commercial biostimulant; T3: TPH-100; T4: TPH-1000; T5: PPH-100; T6: PPH-1000. TDR = Time Domain Reflectometry; ChlM = leaf chlorophyll content index; FlvM = leaf flavonol contents index; AnthM = leaf anthocyanin contents index; NFI = nitrogen-flavonol index (CHL/FLAV ratio); NDVI = normalized difference vegetation index; PRI = photochemical reflectance index; Different letters within each row indicate significant differences according to Tukey’s test (p ≤ 0.05). Data expressed as mean ± standard deviation (n = 3).