Soil-Water Potential: Direct Measurement by a New Technique

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Science  18 Mar 1966:
Vol. 151, Issue 3716, pp. 1385-1386
DOI: 10.1126/science.151.3716.1385


Current methods of measuring the potential of water in soil are inadequate. It is proposed to depress the reference free energy of water by a predetermined amount from the standard level of pure free water at atmospheric pressure by use of a solute. The specific free-energy difference of soil water from the depressed reference can be measured as a pressure.