Spatial Variation of Available Cu and Mn in Soils of Wheat Farms in North of Khuzestan Province

One of the basic principles for sustainable production is improving the quality of soil with regard to soil fertility and soil nutrients status. This study was conducted to investigate spatial variation of copper and manganese elements in soil farms in the northern part of Khuzestan region (100،000 ha). Therefore، 95 soil samples were collected from studied regions according to their wheat cultivation area. The data were analyzed to determine spatial variation and interpolation using Kirging technique. The results revealed that the average soil manganese concentration was 6. 75 mg/kg in the study regions. Also، more than 75% of studied soils had manganese concentrations less than 8 mg/kg (threshold value)، the average of copper concentration was 1. 35 mg/kg، and about 90% of soils had desirable copper concentration. According to the results، there were significant correlations between the soil''s copper and phosphorus (r= 0. 79*)، clay (r= 0. 78*) and salinity (r= 0. 77*) and also between soil''s manganese and pH (r=0. 83*). The best model for study characteristics was the spherical model. The highest soil manganese concentration was on the northeast، and the highest soil copper was on the west of the study regions. Finally، in some parts of the study area in which manganese and copper levels were less than the threshold value، application of copper and manganese fertilizers can be recommended. It increases the yield and improves the soils and agricultural products quality.