THE SPATIAL VARIABILITY OF SOME SOIL PROPERTIES For Al- HAFFAR EAST PROJECT - AL-DEWANA PROVINCE BY TIME SERIES ANALYSIS

Abstract

This study was done on semi-detailed soil survey map of east AL-Haffar project, which located in AL-Dewana province between longitudes 44° 51- 00= - 44° 38- 00= and latitudes 33° 38- 00= - 33° 57- 30=. The project total area was 50000 ha, which survived in 2015 by ministry of water resources /the ecological studies department, included 92 Soil pedons, the traditional method was done with a constant distance of 750m were involved all studies pedons. The spatial variability of some physical, chemical and Morphological properties of these soils were studies, using time series analysis . The results were as follow, the statistical models that are appropriate to describe the soil properties variation. The most frequent was ARMA and autocorrelation coefficient for soil properties was lower than in case of dependence or random lows, which required more samples relying on the autocorrelation of the soil properties was weak (less than 0.5 ) and required more samples in the random status.