Relative soluble salt index for four soil mixtures. Preventing Problems Nursery operators can avoid many soluble salt problems by following three rules. Initially, do not overfertilize. Before planting, submit a representative sample of your medium to a service that evaluates soluble salt concentration. If salt levels are too high, you may be advised to dilute the medium with organic matter or vermiculite.
Many growers elect to submit a second sample during the season to monitor changes in the media.
If salt levels are too high, apply about 15 percent more solution than is required to saturate the medium. As the solution moves down through the soil, salts are carried from the root zone. Growers should be aware, however, that as the soil dries, salt concentration will again increase. Thus, the soil should be kept moist at all times. Proper watering is important.