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Recent droughts in the United States, Africa, and other parts of the world have focused attention on the fact that the world’s water supply is declining rapidly. Maximum potential of horticultural and agronomic crops seldom is attained under natural conditions because of limitations imposed by drought, flooding, cold, heat, acid soils, and other environmental stresses (85, 87, 172).
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Donald T. Krizek (1985) studied this question.
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