TABLE 4.

Composition of major anions and cations in the treatment nutrient solutions.

	Nutrient concentrations (mg L–1)
Treatment	N	P	K	Ca	Mg	Sa	Cl
1	120	40	120	130	45	180	5.0
2	250	40	120	260	45	180	5.0
3	120	80	120	130	45	180	5.0
4	250	80	120	260	45	180	5.0
5	120	40	280	130	45	180	190
6	250	40	280	190	45	180	5.0
7	120	80	280	130	45	180	120
8	250	80	280	190	45	180	5.0
9	70	60	200	130	45	180	190
10	290	60	200	260	45	180	5.0
11	180	20	200	130	45	180	20
12	180	100	200	160	45	180	5.0
13	180	60	60	190	45	180	5.0
14	180	60	340	130	45	180	95
15	180	60	200	130	45	180	5.0
16	180	60	200	130	45	180	5.0
17	180	60	200	130	45	180	5.0
18	180	60	200	130	45	180	5.0
19	180	60	200	130	45	180	5.0
20	180	60	200	130	45	180	5.0

^aIncludes sulphur added by the sulphuric acid used to adjust pH of the nutrient solution.