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A plentiful supply of a reasonably pure water is of importance in greenhouse growth. Such waters are limited in many sections of Oklahoma. Sodium, calcium, and magnesium chlorides occur in deep well waters and in rivers and springs near our salt deposits, calcium sulphate in the leachings from our gypsum hills, and magnesium sulphate in many of our shallow wells. The bicarbonates are general in the western part of the State. Waters as saturated as ocean brines are not uncommon. Under the circumstances it is not surprising that greenhouses frequently encounter difficulties.

SAND CULTURE STUDIES OF THE USE OF SALINE AND ALKALINE WATERS IN GREENHOUSES