Although management techniques may be used to deal with some of these problems, certain situations require more drastic action. RO water is cheaper than distilled or deionized water and the overall quality is the same. While it is possible to purchase an RO system, most units now in operation are under lease. Unfortunately, the use of RO water does not solve all the problems associated with soluble salts. In fact, it can create some very unique situations that are, in many respects, more difficult to correct.
Growers generally take for granted the micronutrients present in irrigation water.
This source of essential elements is extremely important in supplementing a basic fertility program, as well as those nutrients in the growing medium. When micronurients are eliminated from irrigation water through the RO process, plants may be subject to a wide range of nutrient deficiencies. These may occur as the result of a low supply of a particular element or because of an imbalance between nutrients. By mixing their treated water with the normal source, growers can supply many of the needed nutrients and still reduce soluble salts to an acceptable level. At present a 50- 50 mix seems desireable but further reductions in the amount of RO water used may be feasible.