IMPACT OF DIFFERENT IRRIGATION WATER SOURCES ON HYDROPHYSICAL PROPERTIES OF SOME SOIL TYPES | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 8, Volume 28, Issue 10, October 2003, Pages 7519-7530 PDF (3.48 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2003.245510 | ||
| Author | ||
| M. A. Ghazy, | ||
| Soil Water And Environment Research Institute, A.R.e., Egypt | ||
| Abstract | ||
| Long-term Iysimeter experiments were conducted at Sakha Agric. Res. SI. during twelve successive growing seasons started in summer season 1997 to summer season 2003. The aim of this study was to evaluate the effect of irrigation water quality (fresh, treated sewage water and drainage water) on some soil hydrophysical properties of four soils (clay, loamy, sandy and calcareous) with drip irrigation system. The main results could be summarized as follows: The highest values of soil moisture content at different tensions, quickly, slowly and total d rainable pores, water holding pores, soil hydraulic conductivity and total porosity as well as t he lowest values 0 f fine capillary pores and bulk density were achieved with irrigation by treated sewage water in clay and loamy soils. In sandy and calcareous soils the values of quickly, slowly and total drainable pores were decreased, while the water holding pores and fine capillary pores were increased due to irrigation with treated sewage water. The high clay content of soil led to increase the soil moisture content, water holding pores, fine capillary pores and total porosity meanwhile soil moisture retention curves were gradually sloped. But the values 0 f quickly, s lowly a nd total drainable pores, hydraulic conductivity and bulk density were decreased. On the other hand, the high content of sand fractions decreased the soil moisture content, slowly drainable pores water holding pores, fine capillary pores and total porosity, therefore, soil moisture retention curves were very sharply sloped. But the quickly and total drainable pores, hydraulic conductivity and bulk density values were increased. The data indicated that the soil moisture content at different tensions, slowly drainable pores, water holding pores, fine capillary pores and total porosity were highly significantly positively correlated with clay and organic matter contents and EC of soil, but highly negatively with coarse sand. While quickly and total drainable pores, hydraulic conductivity and bulk density are highly significantly positively correlated with coarse sand but highly significantly negatively correlated with clay and organic matter contents and EC of soil. It could be conc!uded that the long term irrigation by treated sewage water improved the soil hydrophysical properties, especially in sandy and calcareous soils. | ||
| Keywords | ||
| water sources; hydrophysical properties; soil moisture characteristics; pore size distribution; soil types | ||
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