Characterization of spatial variability of some physiochemical soil properties of some soil series from Mid- Mesopotamian plain . By Rahal ,Nadhum Shamkhi Kut technical Institute-Middle Technical University/ lraq Nadhum rl@vahoo.com Kut Technical Institute ,Kut ,Wasit governorate. PO Box 81, IRAQ Abstract The present study is conducted to characterize the spatial variability of some soil physio-chemical properties (sand, silt, clay, pH ,EC" ,CEC ,Esp ,O.M and CaGO3) for selected soil series from Mid-Mesopotamian plain. Five soil series were recognized (MM5,MP5.Dw45,DF97,and DP45).Descriptive statistics were used including(Min., Max., Mean, Standard deviation , coefficient of variation, Skewness and kurtosis) .The results showed that, soils was differing significantly (pS 0.05) in all studied physio- chemical properties except for CaCO3 .ln addition, soils exhiblted moderate to high spatial variabifity in the horlzontal scale (cv=21.528-78.327%l in sand and OM respectively except in pH and O.M was of low spatial variability(CV=2.840-8.402%) respectively .Also, soils showed moderate to high vertical spatial variabllity in their physio- chemical properties (cv=16.949-88.337%) in sand and clay particles in MPS and DW45 soil series respectively .On the other hand they showed low and high vertical spatial variability (CV=1.223-102.415o/ol in pH and o.M of DP45 and MPs soil series respectively .Accordingly we see that, soil spatial variability must be studled thoroughly for precise soil management and accurate soil sampling system for taking effective management decisions that leads to sustainable agricultural production. . Key words :spatial variability, coefficient of variation, standard deviation ,geomorphic processes, pedogenic process,Skewness,alluvial soils. ortytt g,,..l--/l cj{Jl .L-J c.l. +-ill &)- Li+l 4iJt+"5Jj.jlill crtl tl cF+l 4r,ils"ll d,l}li3ll 4*.Jj &J gs4^jr fEU s!-JJl 4Jjiill Isbll - c,JS / rlirsll ,(. -t1 ,-eli:,qll elju;Jl ,Jt+.,11 !*l o. s.Ji &)sl LJ!.r,sJEjrill ali,all g'r &4 qP i.r*,its.lt ott,;',.ri5J1 lr.:!:.ire.l i-t1t ob ,',1,;i DP45 oljri , DFST l}rii' , DW45 dhsel 6 Mp 5 6tt o , MM5 ,rrtl )L.j &j-;*^i cr.Jl,-i3 d.drytr .l