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- W567653648 abstract "MEASUREMENTS OF SOIL MOISTURE ARE OF TWO KINDS: THOSE THAT ARE BASED UPON A MEASUREMENT OF THE ENERGY CONDITION OF THE SOIL WATER, AND THOSE THAT MEASURE THE AMOUNT OF WATER IN A GIVEN MASS OR VOLUME OF SOIL. THE ENERGY OF SOIL WATER CAN BE MEASURED WITH PROPERLY CALIBRATED TENSIOMETERS AND PRESSURE EQUIPMENT, VAPOR PRESSURE MEASURING APPARATUS, FREEZING POINT DEPRESSION AND CALIBRATED PLASTER OR OTHER ELECTRICAL RESISTANCE UNITS. AIR PERMEABILITY OF POROUS CERAMIC UNITS SHOWS POSSIBILITIES OF BEING CALIBRATED TO MEASURE THE MATRIC POTENTIAL OF SOIL WATER, AND THE CONDUCTIVITY OF CERAMIC CELLS CAN BE SUCCESSFULLY CALIBRATED TO GIVE AN ESTIMATE OF THE OSMOTIC POTENTIAL RESULTING FROM THE PRESENCE OF SOLUBLE SALTS. THE CONCENTRATION OF WATER IN SOIL CAN BE MEASURED BY THE GRAVIMETRIC OR VOLUMETRIC METHODS OF SOIL SAMPLING, THEN DRYING IN AN OVEN. IT MAY ALSO BE MEASURED WITH THE RECENTLY DEVELOPED NEUTRON METHOD WITH ALMOST AS MUCH ACCURACY AS WITH THE SAMPLING METHODS. THE ERRORS INTRODUCED FROM INFERRING EITHER SOIL MOISTURE CONCENTRATION OR POTENTIAL FROM A MEASUREMENT OF THE OTHER PROPERTY ARE LARGE. SUCH CONVERSIONS SHOULD ONLY BE MADE WHEN APPROXIMATE ESTIMATES ARE ADEQUATE. IT IS MUCH BETTER TO MEASURE THE CONCENTRATION DIRECTLY WHEN INFORMATION CONCERNING THE AMOUNT OF SOIL WATER IS DESIRED. LIKEWISE, IT IS BEST TO MEASURE THE SOIL MOISTURE POTENTIAL WHEN PLANTS OR MOVEMENT IN THE SOIL IS DESIRED. /AUTHOR/" @default.
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- W567653648 date "1966-10-01" @default.
- W567653648 modified "2023-09-27" @default.
- W567653648 title "EVALUATING SOIL WATER" @default.
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