The effect of agricultural exploitation and physiographic location on the soil particle size distribution for soils in Diyala Governorate

Abstract

The study area was chosen to include three physiographic sites on the Diyala River, as it is located in the village of Umm Al-Azam between longitudes 33.71785 east and latitudes 44.6185 north. There are four pedons in each A physiographic unit, two of which are in cultivated sites and the other two are in unexploited agricultural sites, so the total of the studied pedons is twelve. The results of laboratory analyses showed that the sand content in the physiographic units of the cultivated soils ranged between 151.19 - 583.20 g kg-1 , as it was noted that the highest content was in the soils of river basins, while in the physiographic units of the abandoned soils, the sand content ranged between 146.62 - 600.50 g kg -1 , as its highest content was in soils River basins as well. As for the silt particle, the results showed that its content in the physiographic units of the cultivated soil ranged between 170.00 - 543.11 g kg-1 , as it was noted that its highest content was in the soils of the depression unit, while in the physiographic units of the abandoned soils, the content of the silt ranged between 54.42 - 553.01 g kg-1 , as the highest content was in pedons soils the river. As for the particle clay, its content in the cultivated physiographic units ranged between 52.10 - 375.67 g kg-1 , as the highest content was in the soils of river levee, while in the soils of the abandoned physiographic units, it ranged between 54.42 - 335.57 g kg-1 , which was the highest value for it. When soils levee of rivers . Keywords: particle, distribution, physiographic location, agricultural exploitation