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This article in AJ

  1. Vol. 63 No. 5, p. 762-765
    Received: Feb 9, 1971

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Water Balance of a Seed Onion Field1

  1. S. M. Goltz,
  2. C. B. Tanner,
  3. A. A. Millar and
  4. A. R. G. Lang2



Transpiration, evaporation, and drainage from a sparse1y populated onion field were measured separately by a method which should be applicable to many row crops. Transpiration computed from measured evapotranspiration, potential evaporation, and stomatal resistances agreed well with values calculated independently from raeasured stomatal resistance, air vapor pressure, plant-temperature and wind. Transpiration was only about 20 percent of total evapotranspiration. When the population was increased threefold to near maximum commercial density, evapotranspiration increased only about 15 percent because as transpiration increased, evaporation decreased. The portion of transpiration accounted for by each plant part was 3 percent for umbels, 42 percent for leaves and 55 percent for scapes. Drainage from this sandy soil exceeded evapotranspiration.

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