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Coarse styrofoam was a non-toxic, permeable, lightweight material which reduced evaporation from the soil surface by 78% compared with bare soil. This material is easy to apply and allows for uniform evaporation under controlled environmental conditions which have high temperatures and low humidity.
Key Words: water-use efficiency
2 Associate Agronomist, Research Assistant, and Assistant in Research, Department of Agronomy, University of Arizona, Tucson, Ariz. 85721.
Received for publication December 13, 1967.
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