Accession Number : AD0687390

Title :   WATER TRANSFER FROM SOIL TO THE ATMOSPHERE AS RELATED TO SOIL PROPERTIES, PLANT CHARACTERISTICS AND WEATHER.

Descriptive Note : Final rept. Jul 67-Jun 68,

Corporate Author : AGRICULTURAL RESEARCH SERVICE RIVERSIDE CALIF SALINITY LAB

Personal Author(s) : Rawlins,Stephen L. ; Austin,R. S. ; Cullen,E. M. ; Kerkelrath,W. N. ; Hoffman,G. J.

Report Date : DEC 1968

Pagination or Media Count : 139

Abstract : The following advances in technology for measurement of water potential are described: (1) A thermocouple for direct attachment to plant leaves; (2) A microchamber for studying plant responses to environment is described. Light intensity and duration, ambient temperature, relative humidity, and CO2 concentration are controlled. Transpiration, CO2 assimilation, and plant and soil water potential are measured. Data for the ratio of transpiration to CO2 assimilation for cotton are given. Moderate salinity increased this ratio. Description of a contact closure distributer to make a data acquisition system serve as a control device as well as a recorder is given. Also described is a tape editor for handling output data from the system. Preliminary results from experiments to determine how plants integrate time varying salinity indicate that transpiration per unit leaf area is decreased by salinity. (Author)

Descriptors :   (*EVAPOTRANSPIRATION, MEASUREMENT), (*MICROMETEOROLOGY, *WATER), (*SOILS, WATER), PLANTS(BOTANY), METEOROLOGICAL PHENOMENA, WATER VAPOR, PHYSICAL PROPERTIES, HEAT TRANSFER, OSMOSIS, INTERACTIONS, SALINITY, HYGROMETERS, LIQUIDS, ATMOSPHERIC TEMPERATURE, RESPONSE(BIOLOGY), LIGHT, HUMIDITY, EVAPOTRANSPIRATION, CARBON DIOXIDE, PRESSURE, COTTON, GROWTH(PHYSIOLOGY), DATA PROCESSING

Subject Categories : Agronomy, Horticulture and Aquiculture
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE