In terms of geomorphology, the investigated area belongs to the large physical-geographical unit "Banato-Crisana" taking place in the interim relief stage between Western Carpathians and Pannonian Depression edge. Within that sector in which the investigated area meet the following forms of relief: hill, terrace, plain ramble, meadow. Geologically investigated area is part of the Pannonian Depression, its eastern end, which was formed by the gradual silting of the lake in "Pleistocene-Quaternary". Appropriate geological formations mentioned in the soils identified and delineated in the investigated area have generally found the following main groups of parent materials: loam, clays and fluvial deposits. Lugoj hills cover an area of 10.676.33 hectares. The main soil types in the investigated area are stagni-gleyic phaeozems an area of 4.97 ha (0.05%), haplic luvisols on 713.34 ha (6.68%) to 5822.63 ha, typic hapludalfs on 6286.05 ha(55.84%) , haplic planosols on 488.25 ha (4.57%), typic eutrocryepts on 1326.68 ha (12.43%), haplic stagnosols on 301.77 ha (2.83%), haplic gleysols on 426.07 ha (3.99 %), pellic vertisols on 364.47 ha (3.41%) and haplic fluvisols on 625.87 ha (5.86%). This paper is a study of soil fertility improvement methods in Plain River. The different types and groups of genetic soil types existing today in the perimeter are the result of the actions sought in time and space complex pedogenetic factors (underlying rock, landscape, climate, vegetation, hydrography, hydrology, fauna) plus the influences caused by human actions from draining and drainage works to intensive agriculture today. Soils formed in these conditions are a relatively recent stage of soil formation as a result of having little time out of the water. The process of soil formation is relatively recent and their direction of development is dictated largely by the microrelief forms they occupy and thus the groundwater level in the profile, and the nature of parental rocks.

limiting factors, soil fertility, haplic luvisols, haplic stagnosols, haplic fluvisols

Presentation: oral