Capillary Conductivity of Peat Soils at Different Capillary Tensions¹

Structure of Some Organic Soils and Soil Mixtures as Shown by Means of pF Moisture Studies1

“…This indicates that the conductivity for the peat soils is lower at low moisture contents than for the mineral soils but is higher in the region near saturation. This conclusion is verified by the capillary conductivity measurements of Richards and Wilson (4) and also of Wilson and Richards (7). In the region of 200 to 300 em of water tension, the woody peats studied by the latter authors were found to conduct water much more slowly than a loam and more slowly than a sand.…”

An Analysis of Actual Evapotranspiration

“…The measurements mostly cover a limited range from saturation to a suction of 100 to 200 cm (RICHARDS and WILSON, 1936;WILSON and RICHARDS, 1938;CHRISTENSEN, 1944;RICHARDS and MOORE, 1952;NIELSEN a.o. 1960;BUTIJN, 1961;TALSMA, 1963;RUBIN a.o., 1964).…”

Limitations of Auto-Irrigators for Controlling Soil Moisture Under Growing Plants

“…The decrease in the readiness with which soils absorb and transmit water as the moisture content of the soil is decreased, limits the use of auto-irrigators to the wet end of the plant growth moisture range. WLsON and RICHARDS (13) have summarized the experimental data on this subject. A decrease of a few per cent.…”