Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Water Flow in Soil in Presence of Soybean Root Sinks.
Author Ary, Lalit Mohan ;
CORP Author Minnesota Univ., Minnepolis. Water Resources Research Center.
Year Published 1973
Report Number WRRC-Bull-60; DI-14-01-0001-1916; OWRR-B-015-Minn; 14367,; B-015-Minn(7)
Stock Number PB-223 505
Additional Subjects ( Soil water ; Soybean plants) ; ( Soybean plants ; Water loss) ; Evapotranspiration ; Hydraulic conducitivty ; Irrigation ; Soil profiles ;
Library Call Number Additional Info Location Last
NTIS  PB-223 505 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 177p
Water depletion patterns in the ten to 70-cm soil depth in the root zones of two soybean varieties, 79.648 and Chippewa-64, and in a bare soil were established on Waukegan loam. Soil hydraulic properties of the soil profile, suction-water content and hydraulic conductivity-suction relationships were determined in the laboratory and supported by field measurements. Following irrigation, proportional contribution of various soil layers to the total water loss showed a downward shift with the growth state of soybeans. In general, ten-cm layers in the upper horizons contributed a major portion to the total water losses. The contribution of the ten to 20-cm layer remained above 20% while that of the 50 to 60-cm layer accounted for less than 10% of the total water loss from the ten to 70-cm profile. During the early stages of growth the evapotranspiration rate was 0.64 cm/day which agrees with the pan evaporation rate of 0.66 cm/day. Soil outside the ten to 70-cm zone contributed about 0.2 cm/day towards evapotranspiration. About 55% of the soil volume showed root densities of one to two cm/cu cm. Generally, root density tended to be higher near the plant rows and between the 25 and 45-cm depths below the surface.