Cracau-Bistrita Depression it belongs to the investigated it is a unique physical geographical unit within Moldavian Subcarpatians, which occupies the center of the groove subcarpathic between Moldova and the Trotus Rivers. In geological terms we refer territory corresponds to a restricted part of the Moldavian Platform appears as an extension to the southwest of Russian platform. Geological rocks that are part of the northwest Cracau-Bistrita Depression parent materials generated relatively differentiated by features and nature that can be eluvial, colluvial and alluvial. After compiling size, they are made of clay and marly clay, sand, alluvial deposits. The main pedogenetic processes which led to differentiation and the formation horizons of soil the soil cover of the northwest Cracau-Bistrita Depression may be mentioned bioaccumulation, clay migration, argillisation, gleyzation and stagnogleyzation. Ensemble pedogenetic factors and pedogenetic processes specific area led to the formation of a coating on the ground floor consists of relatively varied protisols, cernisols, cambisols, luvisols, hidrisols and antrisols. Of these, the largest share is occupied by cernisols. Arable land suitability is limited by several factors, of which the most important are considered the soil, topography and drainage. So outstanding were six classes of land: from those with very good suitability for field crops, without restriction, to land that can be used only for forests as those from nearby watercourses due to flooding. Misuse of the land has led to extreme natural phenomena, considered risks that go to produce immense damage by reducing agricultural production. I particularly physical, chemical and complex risks. Most worthy of notice covers the main physical and chemical properties of soil and land degradation by destroying the soil. In order to eliminate the negative effects of limiting factors of agricultural production, reducing risk and thereby improving the productive potential of the northwest Cracau-Bistrita Depression were proposed a series of works agropedoameliorative such as regulation of water and embankment works, paper land on the contour and avoiding weeding plant cultivation on slopes, erosion control works and avoid prolonged grazing early spring or fall, ripping papers for land compacted or affected by excess moisture.

The paper emphasizes the polyphasic evolution of a saline soil and its development towards a zonal soil. Most saline soils have formed in river beds, on parental materials made up of stratified fluvial deposits. Over time, depending on the distance to the river bed and the frequency of flooding, these soils have developed more or less towards the zonal soil. The study plot is located in Bârlad Valley, Bârlad Tableland, where the Tma is 9.3ºC and Pma is 535.5 mm. The soil is an Aluviosol mollic salinic, with relict gleization covering at 60 cm a Chernozem aluvic-salinic, with relict gleization (according to SRTS-2012). In WRB-SR, this soil is classified as a Gleyic Fluvisol. The soil formed in an un-uniform parental material (specific to soils formed in fluvial materials). As a result, the soil profile consists of two main sequences: 1) a sequence (0-60 cm) representing the actual soil (Salinic Aluviosol, with relict gleization) consisting of three pedogenetic horizons that have not sufficiently evolved to become the zonal soil. The differentiation of the horizons of this sequence is due to the cyclic sedimentation processes and, to a lesser extent, to a weak pedogenesis; 2) a second sequence (60-210 cm) representing a soil material consisting of several deposits (stratifications) which: a) had no time to integrate each others and to form a soil; the soil material evolved in marshland being continuously elevated. At a certain moment, the area was drained, and now the horizons constituting the upper part of the buried sequence (60-122 cm) have the appearance of mollic horizons, and the soil trend to developed towards Cernisol (Chernozem respectively); b) are not sufficiently contrasting in terms of texture, so they can be considered as lithological discontinuities and consequently denoted with prefix numbers. The current pedogenetic processes that influence the development of this soil profile (consisting of two overlapped soils) are those of the attenuation of the characteristics inherited from the parental material and those which oriented the pedogenesis throughout the formation of the zonal soil. Land

No abstract

Sandy soils from Oltenia Plain occupies the largest area in the country, about 209.400 ha and are situated on terraces of the Danube, the Jiu and Olt River and west Oltenia Plain. The primary material of the origin of the sand in the south Oltenia is the Carpathians South of Olt and Jiu, the differences consisting of the amount somewhat less coarse sand by the Danube, rich in calcium carbonate thereof as compared to the sand and sandy soils from Left Jiu. The territory between Olt, Jiu, and Danube consists of two distinct areas: one field Leu-Rotunda, located in southeastern Oltenia. This field is a continuation of the surface of the plateau levatinului Piedmont. The second area is formed by terraces Olt, Jiu and Danube. This area has the absolute altitude between 110-140 m with slopes to the east and south. As such relief formations have shown sandy dunes and interdune form. Dunes had heights of 5-15 m and 100-500 m width were interdune. Area with sandy soils in southern Oltenia is crossed by a river system, represented by the Danube River to the south, Olt River to the east and west Jiu River. Plant growth and development of the sandy, is related to the presence of water, which has a decisive role. Low rainfall, high temperatures and Austru wind, warm and dry, make sands of Oltenia sometimes take the form of semi-desert. From an textural, in most cases, the percentage of coarse sand is higher and the lower sand on the dune and the interdune increase both the proportion of sand and the clay. In Oltenia Plain appear dominant cernisols represented by typical chernozems, calcic chernozems, cambic chernozems, gleyic chernozems and argic chernozems, which are added some luvisols of type reddish preluvosols and typical luvosols and some typical eutricambosols. Not missing hidrisols nor salsodisols, and in floodplains and terraces predominate protisols with distric psamosols and eutric aluviosols. Lately, as a result of pedoameliorative measures, such as shaping and leveling, were essential changes in both the forms of relief, and the main physical and chemical properties, disappearing dunes due to mobilization on higher ground sand and depositing the material in interdune. Excavated and deposited quantities of sand are varied both in terms of origin and physic and chemical properties. Production potential is medium. Requires to stem deflation, the increase in organic matter in the soil and especially in the areas set (level model), the fertilization and maintaining forest cover.