ESTIMATION OF SOIL WATER RETENTION CURVE WITH THE DERIVED POINT PEDOTRANSFER FUNCTIONS

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GHORBANI DASHTAKI SH.; HOMAEI M.

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Journal: Year:2005 | Volume:10 | Issue:4 Page(s): 157-166

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Title

ESTIMATION OF SOIL WATER RETENTION CURVE WITH THE DERIVED POINT PEDOTRANSFER FUNCTIONS

Author(s)

GHORBANI DASHTAKI SH. | HOMAEI M. | Issue Writer Certificate

Keywords

PEDOTRANSFER FUNCTIONSQ4

SOIL HYDRAULIC PROPERTIESQ4

SOIL WATER RETENTION CURVEQ4

UNSATURATED ZONEQ4

Abstract

Quantitative description of the SOIL WATER RETENTION CURVE is central for many applications in agriculture. The direct measurement of this soil hydraulic function is time consuming and expensive. Alternatively, the indirect methods are increasingly used to estimate the SOIL WATER RETENTION CURVE. The so-called PEDOTRANSFER FUNCTIONS (PTFs) that can be regarded as a bridge between the "easily obtainable" and "difficult to obtain" properties are used as an indirect method in recent years. The objective of this study was to develop and verify some point PTFs to predict the retention curve. Also, the possibility of using geometric mean and geometric standard deviation of particle diameters instead of soil particle size distribution was investigated. Consequently, 34 soil samples were collected randomly from Karaj area, Karaj, Iran. The particle-size distributions and bulk densities of the soil samples were determined with the hydrometry and core method, respectively. The retention curve was obtained using pressure plate apparatus. The easily obtainable variables were separated into two groups: (i) particle size distribution and bulk density, (ii) bulk density, geometric mean and geometric standard deviation of particle diameters. Two point PTFs types were developed to predict six points at the soil moisture characteristics, using the stepwise regression method. The results indicated that the second specified variables (ii) can better predict the soil moisture characteristic at -30, -100, -300, -500 and -1500kPa. The geometric mean and geometric standard deviation of particle diameters appeared to have larger influence to predict the water contents at drier parts of the retention curve than the soil bulk density. This can be related to the fact that at near saturation the water content is mainly affected by total soil porosity, while at lower water contents particularly near the FC up to the wilting point, the soil moisture is more influenced by geometric pore size distribution.

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APA: Copy

GHORBANI DASHTAKI, SH., & HOMAEI, M.. (2005). ESTIMATION OF SOIL WATER RETENTION CURVE WITH THE DERIVED POINT PEDOTRANSFER FUNCTIONS. JOURNAL OF AGRICULTURAL SCIENCES, 10(4), 157-166. SID. https://sid.ir/paper/7721/en

Vancouver: Copy

GHORBANI DASHTAKI SH., HOMAEI M.. ESTIMATION OF SOIL WATER RETENTION CURVE WITH THE DERIVED POINT PEDOTRANSFER FUNCTIONS. JOURNAL OF AGRICULTURAL SCIENCES[Internet]. 2005;10(4):157-166. Available from: https://sid.ir/paper/7721/en

IEEE: Copy

SH. GHORBANI DASHTAKI, and M. HOMAEI, “ESTIMATION OF SOIL WATER RETENTION CURVE WITH THE DERIVED POINT PEDOTRANSFER FUNCTIONS,” JOURNAL OF AGRICULTURAL SCIENCES, vol. 10, no. 4, pp. 157–166, 2005, [Online]. Available: https://sid.ir/paper/7721/en

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