New Polymer Tensiometers: Measuring Matric Pressures Down to the Wilting Point
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منابع مشابه
New Polymer Tensiometers: Measuring Matric Pressures Down to the Wilting Point
Tensiometers are commonly used for measuring soil water matric pressures. Unfortunately, the water-filled reservoir of conventional tensiometers limits their applicability to soil water matric pressures above approximately20.085 MPa. Tensiometers filled with a polymer solution instead of water are able to measure a larger range of soil water matric pressures. We designed and constructed six pro...
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Efforts by several investigators to measure availability of water to plants by vapor pressure (2, 12) and other methods (10, 14) have indicated that the potential of water at the permanent wilting percentage is approximately 16 x 106 ergs per gram, whereas others (1, 11) have obtained results which indicate somewhat lower values. A great many experiments (3, 4, 5, 6, 13) have demonstrated that ...
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A variety of techniques to measure matric potential or water potential in the laboratory and in the field are described in this section. The techniques described herein require equilibration of some medium whose matric or water potential can be determined from previous calibration or can be measured directly. Under equilibrium conditions the matric or water potential of the medium is equal to t...
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Lewis has already pointed out that a theory of the kind outlined in this paper explains satisfactorily the facts which have led many chemists to assume polar valence. For example, the chlorine atom in chlor-acetic acid, because of the relatively large charge on its kernel, as compared for example with a carbon atom, tends to displace towards itself the electrons holding it to the carbon atom. T...
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In traditional Chinese and Korean medicine, doctors first observe a patient's pulse by gently and strongly pressing their fingers onto the wrist, and then make a diagnosis based on the observed pulse waves. The most common method to implement this diagnostic technique is to mechanically extract the pulse waves by applying a fixed range of pressures for all patients. However, this method does no...
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ژورنال
عنوان ژورنال: Vadose Zone Journal
سال: 2007
ISSN: 1539-1663
DOI: 10.2136/vzj2006.0110