7.2. Nutrient solution recipe for tomato (De Kreij et al., 1997)
Nutrient/element	Starter solution	Root environment (range)	Refilling solution
EC* in dS m−1	3.7	2.5–5.5	1.5
pH	5.6	5–6	5.6
mmol l−1
NO3	23	15–31	10.75
NH4	0.1	0.1–0.5	1.0
K	8	5.3–10.6	6.5
Ca	10	6.6–13.3	2.75
Mg	4.5	3–6	1.0
SO4	6.8	4.5–9.0	1.5
P	1.0	0.7–1.3	1.25
HCO3	<1	0–1.0
Na	<12	0.1–12.0	0
Cl	<15	0.1–15.0	0
μmol l−1
Fe	25	13–38	15
Mn	5	2–7.5	10
Zn	7	3.5–10.5	4
B	50	25–75	20
Cu	0.75	0.4–1.1	0.75
Mo	0.5	0.3–0.8	0.5