Yousef, K., Mohmed, M., Mohmed, E., Galal, M., EI-Gendy, R. (2004). DETECTING SOIL MOISTURE RETENTION CURVE FROM I SITU MEASUREMENTS. Journal of Soil Sciences and Agricultural Engineering, 29(2), 997-1012. doi: 10.21608/jssae.2004.240821
Kholod M. Yousef; M.A. Mohmed; EI- Hasnaa A. Mohmed; M.E. Galal; R. W. EI-Gendy. "DETECTING SOIL MOISTURE RETENTION CURVE FROM I SITU MEASUREMENTS". Journal of Soil Sciences and Agricultural Engineering, 29, 2, 2004, 997-1012. doi: 10.21608/jssae.2004.240821
Yousef, K., Mohmed, M., Mohmed, E., Galal, M., EI-Gendy, R. (2004). 'DETECTING SOIL MOISTURE RETENTION CURVE FROM I SITU MEASUREMENTS', Journal of Soil Sciences and Agricultural Engineering, 29(2), pp. 997-1012. doi: 10.21608/jssae.2004.240821
Yousef, K., Mohmed, M., Mohmed, E., Galal, M., EI-Gendy, R. DETECTING SOIL MOISTURE RETENTION CURVE FROM I SITU MEASUREMENTS. Journal of Soil Sciences and Agricultural Engineering, 2004; 29(2): 997-1012. doi: 10.21608/jssae.2004.240821
DETECTING SOIL MOISTURE RETENTION CURVE FROM I SITU MEASUREMENTS
1Soil and Water Res. Dept. Nuclear Res. Center, A.E.A., Cairo, Egypt.
2Soils Dept. Fae. Agric. Ain Shams Univ Cairo, Egypt.
Abstract
,This work aims to detect soil moisture retention curve of sandy soil up to 15 bars using in situ measurements of tensiometers and neutron probe. An experiment had been conducted in Inshas at the Farm of Soil and Water Researches Department. Nuclear Researches Center. Atomic Energy Authority. Tensiometers and neutron moisture meter were used to determine soil matric potentials and soil moisture contents (9), simultaneously. Some values of soil matric potential in tensiometric range and the versus moisture contents were' used to calculate van Genuchten parameters (m, n, and q.). This method Called tensiometric method. This method and van Genuchten method are differed through tho calculation of these parameters, where van Genuchten's depends on all data of 9 and II until 15 bars while in tensiometric -method depends on e and h in tensiometnc range only. The outputs of these 'methods had been tested statistically and compared with different methods to evaluate .its outputs.
The' obtained data showed no significant differences between the outputs of tensiometric. Brooks- Corey, and modified Brooks, Corey methods in the range of the experimental data, whenever van Genuchten, Campbell and its modified method were non- significant differ~nces for the two depths. Brooks - Corey and Campbell's methods gave- abnormal data at saturation point.
Calculations of tenslomelric method are' easier than van Genuchten's one and it considered field one because it depends on the in situ measurements.