APPARATUS FOR MEASURING WATER-VAPOR TRANSPORT AT THE SOIL SURFACE

Citation
Iam. Saeed et al., APPARATUS FOR MEASURING WATER-VAPOR TRANSPORT AT THE SOIL SURFACE, Agronomy journal, 86(1), 1994, pp. 208-211
Citations number
3
Categorie Soggetti
Agriculture
Journal title
ISSN journal
00021962
Volume
86
Issue
1
Year of publication
1994
Pages
208 - 211
Database
ISI
SICI code
0002-1962(1994)86:1<208:AFMWTA>2.0.ZU;2-1
Abstract
To fully characterize the water and energy balances of a field crop it is necessary to separate soil evaporation from total canopy evapotran spiration. An alternative to measuring soil evaporation directly is to measure the vapor exchange at the soil surface in order to assess mas s transfer there. The objective of this research was to develop a meth od for measuring vapor exchange coefficients beneath plant canopies. T he system consists of a Mariotte siphon water supply apparatus and a f elt-covered vapor source plate, both of which were tested under labora tory and field conditions. A detailed description of the devices, thei r construction and operation, and a sample data set are presented. The system is suitable for long-term field installation and is capable of accurately measuring vapor transfer rates over short time intervals.