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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/9938

Title: Effect of Cultivation on Some Soil Quality Indicators in Harad and Al-Kharj Soils, Saudi Arabia
Authors: A. Sh. Sallam
M. Al-Sewailem
M. Al-Harbi
Issue Date: 2005
Publisher: Second Symposium of the Saudi Arabia Society of Agricultural Sciences, "Saudi Agriculture - Opportunities and Challenges" Saudi Arabia
Abstract: Pedological characteristics of the soils in Harad and Kharj are quite different in the source of parent materials, topography and the presence of diagnostic horizons and hardpans. The main objective of this research was to evaluate the effect of cultivations on some soil quality indicators for sustainable management of Harad and Kharj soils. Twenty soil profiles represent number of farms were selected. The farms varied in the management practices and cultivation periods. Soil profiles were morphologically described in the field, then samples were collected from the subsequent horizons analyzed in the laboratory. Results indicated that Harad soils were classified to torrifluvents, calcigypsids and petrogypsids while Al-Kharj soils belong to torrifluvents and haplocalcids. Changes in soil quality parameters due to cultivation periods include increasing the thickness, darkening and O.M content of the surface Ap horizon and improvement of soil structure. Relative Horizon Distinctness (RHD) values for surface horizons were improved with the increase in cultivation periods. Soil erosion has negative effect on the thickness of Ap horizon of calcigypsids. Irrigation systems affected the soil salinity, with increasing cultivation periods the ECe values decreased in torrifluvents of Harad under surface irrigation while it increased under drip irrigation and green house cultivation. On the other hand ECe increased in most of Al-Kharj soils with the increase in cultivation periods under sprinkler irrigation. Amorphous silica (Siam) dominated the amorphous materials and increased with cultivation particularly in the Ap horizon. Amounts of available nutrient varied considerably with cultivation in either Harad or Al-Kharj soils. It decreased in the soils cultivated for less than 5 years and commonly increased with intensive cultivation and at 25 years cultivation. K level decreased with cultivation compared with uncultivated soils. Infiltration rate in the haplocalcids at Al-Kharj decreased after 15 years of cultivation due to the deterioration of some soil properties i.e. SAR, ESP and clay dispersion. Therefore this study shows deteriorations in some soil quality indicators as a result of cultivations and improper management practices. Improvement can be obtained with proper monitoring of soil quality parameters and management practices.
URI: http://hdl.handle.net/123456789/9938
Appears in Collections:College of Foods And Agricultural Science

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