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A degradacao da terra pela agricultura e apontada como uma das principais causas da desertificacao. No semiarido brasileiro a Caatinga e frequentemente substituida por pastos herbaceos ou culturas de ciclo curto; a exposicao do solo favorece a erosao; o cultivo continuado leva a perda da fertilidade; e o mau manejo da irrigacao pode levar a salinizacao. Com o objetivo de avaliar a influencia da irrigacao no processo de desertificacao do municipio de Cabrobo-PE, foram realizadas coleta de solo e analises da Condutividade Eletrica do extrato de saturacao (CEes) e da Percentagem de Sodio Trocavel (PST). Os resultados indicam que as tecnicas de irrigacao empregadas, por sulco e/ou por inundacao, no cultivo de cebola (Allium cepa L.) e arroz (Oryza sativa L.), sem a implantacao de um sistema artificial de drenagem, estao conduzindo a elevacao dos teores de sais dos solos irrigados. Normal 0 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri",sans-serif; mso-ansi-language:PT-BR; mso-fareast-language:PT-BR;} A B S T R A C T Land’s degradation by agriculture is identified as a of principal causes of desertification. In the Brazilian semiarid the Caatinga is often replaced by herbaceous or short cycle culture; soil exposure support erosion; continued the cultivation leads to loss of fertility; and the bad management of irrigation that can to lead to salinization. With the objective of to value the influence of irrigation in the process of desertification of municipality Cabrobo – Pernambuco, went achieved collection of soil and or parses of Electrical Conductivity of the saturation extract (ECse) and of Exchangeable Sodium Percentage (ESP). The results indicate that irrigation techniques employed, by furrow and/or flood, in the cultivation of onion ( Allium cepa L .) and rice ( Oryza sativa L .), without the implantation of an artificial drainage system are leading to elevation of purports of salts of irrigated soils. Keywords: susceptibility, salinization, brazilian semiarid. |
