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This article in AJ

  1. Vol. 59 No. 3, p. 262-265
    Received: Dec 21, 1966



Effect of Plant Population and Row Spacing on Evapotranspiration and Water-Use Efficiency by Soybeans1

  1. D. R. Timmons,
  2. R. F. Holt and
  3. R. L. Thompson2



During 1964 and 1965, Chippewa and Merit soybeans were planted in 20-, 61-, and 102-cm rows at populations attained from seeding rates of approximately 34, 67, and 135 kg/ha. Evapotranspiration from planting to the first killing frost ranged from 32.8 to 38.0 cm and from 42.3 to 46.2 cm for 1964 and 1965, respectively. Neither row spacing nor plant population significantly affected evapotranspiration during the 2 years studied. Generally, highest water-use efficiencies were obtained for the lower plant populations in 20-cm rows. Soybeans produced per hectare-centimeter of water used varied from 55 to 60 kg for 1964 and from 50 to 59 kg for 1965.

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