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Effects of Root and Subirrigation Depth on Evaporation and Percolation Losses

CSIRO Centre for Environmental Mechanics, GPO Box 821, Canberra, ACT 2601, Australia

*Corresponding author.

ABSTRACT

Loss from surface evaporation and from percolation limit the efficiency of subirrigation. This study yields bounds on the relative magnitude of the two types of losses. Quasilinear results on evaporation from buried steady sources are used to investigate the effects of source depth and root sink depth on soil evaporation and deep-percolation losses from subirrigated crops. The study quantifies the concept that the deeper the source relative to the roots the smaller the soil evaporation loss and the larger the deep-percolation loss.

Contribution from CSIRO Australia.

Received for publication December 4, 1990.