The paper refers to an acreage of 755409 ha, of which 511520 ha arable terrains. This area is situated in Western Romania and gathers 75 cadastral territories belonging to Arad County . 　　　The authors present a description of hydrological, geological, geomorphological condition diversity, which had effect on soil cover structure (comprised soil yield capacity), found to be very heterogeneous in space and time. 　　　In its activity, OSPA Arad performed numerous pedological and agrochemical studies. This survey, developed on mentioned area had shown the following categories of soils: 　　　Reaction : moderate and strong acid over 150.000 ha, moderate alkaline over 45.000 ha, strong and excessive alkaline 16.000 ha.; 　　　Humic reserve (0-50 cm ) : low 180.000 ha, very and extremely low 125.000 ha; 　　　Mobile potassium (0-20, or Ap): middle: 155.000 ha, low: 42.000 ha 　　　Mobile phosphorous (0-20, or Ap) low and very low: 225.000 ha, 　　　Humidity excess: 150.000 ha 　　　Erosion: 125.000 ha 　　　Secondary compactness:370.000ha, 　　　Humidity deficit: 250.000 ha. 　　　Having in view this situation, we state that structure recovery, fertility degree improvement, prevention and fight soil phenomena and degradation processes, could be designed only through detailed acknowledge on area characteristics, which means structural and functional aspects of climatic and telurico-edaphic factors offer.

factor, edaphic, resources, limitative, productive

Presentation: oral