Document Type

Article

Publication Date

10-2021

Publication Title

The Journal of Agriculture of the University of Puerto Rico

Publisher

University of Puerto Rico

DOI

https://doi.org/10.46429/jaupr.v105i2.20073

Abstract

Drought mortality of juvenile trees is a major cause for failure of reforestation projects. Portable devices such as passive radiative dew condensers can often provide 0.15 L/day of water in situ, possibly sufficient for tree survival until roots can access groundwater, allowing self-sustainability. To evaluate growth and survivability of juvenile trees of Tabebuia heterophylla Britton and Swietenia macrophylla King under such low water amounts, juvenile trees received approximately 0.033, 0.067, 0.134, 0.201 and 0.268 L/tree/day, representing fractions (relative evapotranspiration or RET) of 0.125, 0.25, 0.50, 0.75 and 1.00 of the evapotranspiration demand (ETo). The experiment lasted 60 days for S. macrophylla and 90 days for T. heterophylla. All T. heterophylla juvenile trees survived even at the lowest irrigation rate. However, S. macrophylla juvenile trees began dying at RET < 0.5, with only 60 percent surviving at RET = 0.25 (0.067 L/day) and 100 percent mortality occurring at RET = 0.125 (0.033 L/day). Water requirements of 0.134 L/day, necessary for full survival of both species, were within the typical production capacity of 1-m2 dew condensers. However, a greater safety
factor is obtained using drought tolerant species such as T. heterophylla, which can survive under water application rates as low as 0.03 L/day.

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