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Table 3 pH, EC, ash content, total macro- and micronutrients, total Cd, total Pb, total polyphenols and antioxidant activity content in BSG 1:25 FPR 1:100 and LPR 1:200 aqueous extracts

From: Extraction and characterization of bio-effectors from agro-food processing by-products as plant growth promoters

Aqueous extracts   BSG 1:25 FPR 1:100 LPR 1:200
pH   5.5 ± 0.1 5.5 ± 0.2 3.3 ± 0.1
EC dS m−1 0.2 ± 0.0 0.6 ± 0.1 0.5 ± 0.0
Ash % 18.5 ± 0.2 25.0 ± 1.1 9.3 ± 0.3
Total N   40.0 ± 0.4 157 ± 10 10.0 ± 0.2
Total P   47.2 ± 0.2 43.6 ± 0.3 3.78 ± 0.2
Total K   19.4 ± 1.8 330 ± 8.7 50.1 ± 4.5
Total Ca   58.3 ± 0.4 8.22 ± 0.55 34.7 ± 2.7
Total Mg   34.3 ± 0.40 5.41 ± 0.8 5.49 ± 0.60
Total Na   5.44 ± 1.1 72.0 ± 2.3 5.46 ± 0.48
Total Cu mg L−1 0.05 ± 0.01 0.11 ± 0.00 0.05 ± 0.00
Total Fe   0.44 ± 0.08 0.43 ± 0.10 0.55 ± 0.04
Total Mn   0.32 ± 0.01 0.17 ± 0.00 0.03 ± 0.00
Total Ni   0.03 ± 0.01 0.06 ± 0.00 0.02 ± 0.00
Total Zn   0.18 ± 0.05 0.27 ± 0.06 0.27 ± 0.05
Total Cd   <0.005 <0.005 <0.005
Total Pb   0.01 ± 0.00 0.01 ± 0.00 0.01 ± 0.00
Total polyphenols g kg−1 10.57 ± 1.96c 57.88 ± 5.61a 49.54 ± 3.13b
Antioxidant activity mM trolox L−1 1.81 ± 0.31c 5.55 ± 1.01a 3.77 ± 0.44b
  1. Values reported are average of three replicates ± standard deviation. Within same row, means with different letters (a, b, c) indicate significant difference between values at P < 0.05(LSD Fisher's test).
  2. BSG, brewers spent grain; FPR, fennel processing residues; LPR, lemon processing residues.