Vapor pressure deficit, temperature, and light affect postharvest drying of Fraser fir and eastern white pine
Hinesley, L.E. | Snelling, L.K.
Branches of Fraser fir [Abies fraseri (Pursh) Poir.] and eastern white pine (Pinus strobus L.) were subjected to various temperatures, vapor pressure deficits (VPD), and light regimes in controlled-environment chambers. Drying rates, based on measurements of needle water potential, were accelerated by increasing VPD, high temperature, and light. Fraser fir and white pine dried to -4.0 MPa and -3.0 MPa, respectively, in about the same time. The relationship of moisture content (MC) to water potential was linear for Fraser fir, quadratic for white pine. The MC of Fraser fir at -4.0 MPa was also a linear function of VPD during drying. Water loss was greatest early in the drying cycle, and high temperature (25C) promoted rapid drying, even at low VPD.
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