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Water Storage and Drainage under a Row Crop on a Sandy Soil¹

Drainage from the root zone of snap beans grown on a sandy soil was measured by a lysimeter, and calculated from Darcy's law, and by a hydrologic balance equation. At the end of a 60-day period the Darcy's law calculation gave a 11% higher estimate of the cumulative drainage than the other two methods. Of the 32 cm of precipitation and decrease of 3 cm in water storage from emergence to harvest, evapotranspiration accounted for 17 cm, and drainage for 18 cm. A useful estimate of the drainage from the root zone in sandy soil was obtained from the space averaged capillary conductivity of the soil in which rooting occurred.

Key Words: Drainage • Evaporization • Soil-water storage

² Formerly Research Assistant (now Assistant Professor, Department of Soil Science, University of British Columbia, Canada), and Professors of Soil Science, University of Wisconsin, Madison 53706.

Received for publication June 11, 1969.