CARACTERIZAÇÃO QUÍMICA DO SOLO EM UMA ÁREA DE IMPLANTAÇÃO DO PROJETO DE RECUPERAÇÃO DE ÁREAS DEGRADADAS DA JICA NO MUNICÍPIO DE PEDRO AVELINO-RN

For proposition of the better recovery practice is necessary to identify the main characteristics of index fingers soil of environmental degradation. For so much, it should seize upon chemical, physical and biological analyses. Thus, the goal of this work was to study some chemical indicators of environmental degradation in soils terms of semiarid. The soils were collected in the pilot's area JICA Project located in the municipal district of Pedro Avelino-RN, the choice of the area was due to your desertification degree. The analyses were accomplished in Soil, Plant and Water Analyses Laboratory of the University Semi-arid Rural Federal. The samples were collected in the layers of 5, 10, 20, 30 and 50 cm. The accomplished chemical analyses were: pH in water (1:2,5); Electric Conductivity (CE) in the extract 1:5; Ca+2,Mg+2, Na+ and K+ exchangeable, and P available. By the results, it verified that pH and CE increased with the depth, with regard to the contents of In the Na+ in the soil there was variation with the increase of the depth. To the thwart of the majority of the analyzed elements the K+ tended to decrease your content in the soil with the increase of the depth, The sodium elevated contents should be carried in consideration for the implantation of the recovery project, using itself preferentially resistant plants of sodicity.