| | Pedotransfer function - Wikipedia, the free encyclopedia |
 | | They determined the wilting coefficient, which is defined as percentage water content of a soil when the plants growing in that soil are first reduced to a wilted condition from which they cannot recover in an approximately saturated atmosphere without the addition of water to the soil, as a function of particle-size: |
 | | Wilting coefficient = 0.01 sand + 0.12 silt + 0.57 clay |
 | | With the introduction of the field capacity (FC) and permanent wilting point (PWP) concepts by Frank Veihmeyer and Arthur Hendricksen (1927), research during the period 1950-1980 attempted to correlate particle-size distribution, bulk density and organic matter content with water content at field capacity (FC), permanent wilting point (PWP), and available water capacity (AWC). |
| en.wikipedia.org /wiki/Pedotransfer_function (933 words) |