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. 2023 Jan 17;12(3):422. doi: 10.3390/plants12030422

Table 3.

Concentrations (mg∙L−1) of nutrient elements (plus Na) and electrical conductivity (EC, µS∙cm−1) in the rainwater and each of the nutrient treatments according to third party laboratory analysis of freshly made batches of solutions. Shaded cells highlight the elemental concentrations of the deficient nutrient in the respective treatments.

Element Measured Solution Concentrations (mg∙L−1)
Rain-Water Control -N z -P -K -Ca -Mg -S -Fe -Mn
N 7 130 4 130 120 130 120 120 120 130
P <1 35 34 <1 34 32 35 31 34 32
K <1 130 87 140 5 130 130 130 130 130
Ca 9.1 130 61 140 130 9.7 120 120 120 120
Mg 0 39 21 39 40 35 1.8 35 39 37
S 6.4 54 58 54 52 50 49 2.9 53 50
Fe 0.19 0.93 1.3 1.2 0.77 1.6 0.86 1.6 0.01 1.4
Mn 0.04 0.76 0.76 0.78 0.76 0.74 0.74 0.65 0.73 0.02
Zn 0.38 0.43 0.41 0.44 0.43 0.26 0.45 0.14 0.43 0.41
Cu <0.01 0.03 0.04 0.03 0.03 0.02 0.04 0.04 0.03 0.04
B <0.01 0.43 0.43 0.43 0.43 0.41 0.43 0.39 0.44 0.41
Mo <0.01 0.02 0.03 0.02 0.03 0.02 0.02 0.02 0.03 0.01
Na 3.1 21 20 4 96 160 90 18 20 19
Cl 17 10 130 23 11 12 11 110 10 9
EC (dS∙m−1) 0.1 1.6 0.9 1.6 1.4 1.6 1.5 1.6 1.5 1.6

z the “-” sign denotes the missing element in each of the respective treatments.