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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Indicadores de sustentabilidade em sistemas agroecolÃgicos por agricultores familiares do semi-Ãrido cearense / AgroecolÃgicos pointers of sustentabilidade in system lead by family agriculturists at the Cearà state semiarid

Adervan Fernandes Sousa 03 August 2006 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / Para avaliar a percepÃÃo dos/as agricultores/as quanto Ãs mudanÃas em seus sistemas de produÃÃo e alguns indicadores destas, o presente trabalho foi desenvolvido com agricultores/as adotantes de sistemas de produÃÃo de algodÃo em bases agroecolÃgicas no semi-Ãrido cearense. A proposta de produÃÃo do algodoeiro nas bases comentadas tem a efetiva participaÃÃo dos/as agricultores/as em todo o processo e busca a sustentabilidade ecolÃgica dos sistemas, por meio de prÃticas que mantenham ou recuperem as fertilidades fÃsica, quÃmica e biolÃgica do solo. A identificaÃÃo de indicadores foi feita atravÃs do diagnÃstico participativo envolvendo agricultores dos municÃpios de TauÃ, Chorà e MassapÃ. Os indicadores selecionados foram os de qualidade quÃmica: carbono orgÃnico total (COT), taxa de estratificaÃÃo do COT, teores mÃdios de Ca2+, Mg2+ e K+ trocÃveis, fÃsforo (P) disponÃvel, capacidade de troca catiÃnica (CTC) e valores de pH do solo; os de qualidade fÃsica: densidade do solo, macro e microporosidade e retenÃÃo de umidade; e os de qualidade biolÃgica: diversidade, abundÃncia, riqueza, Ãndices de Shannon e de Pielou da fauna epigeÃca do solo. Para testÃ-los, foram avaliadas quatro Ãreas a saber: duas sob sistema de produÃÃo em bases agroecolÃgicas pertencentes aos agricultores Josà Eduardo Sobrinho (JESA) e Raimundo Valentim de Sousa (RVSA) e duas outras Ãreas, sendo uma sob vegetaÃÃo natural (JESN) e outra sob cultivo tradicional (RVST), tambÃm dos mesmos agricultores citados e na seqÃÃncia respectiva. Essas Ãreas estÃo localizadas no municÃpio de Tauà â CE. Com os resultados obtidos, concluiu que os/as agricultores/as que adotam os sistemas de produÃÃo em bases agroecolÃgicas sÃo capazes de identificar indicadores de sustentabilidade em suas Ãreas nos diferentes aspectos considerados no contexto de sustentabilidade â solo (ambiental), social e econÃmico, e que as qualidades quÃmica, fÃsica e biolÃgica do solo da Ãrea JESA foram superiores as da Ãrea JESN. Por outro lado, as qualidades quÃmica, fÃsica e biolÃgica das Ãreas RVSA e RVST, foram semelhantes. / To evaluate the farmerâs perception about the changes in their systems and in some production pointers, the present work was developed with farmers that adopt cotton production systems in agroecolÃgicas bases at the Cearà state semiarid. The cotton plant production proposal in the commented bases has the effective participation of farmers in the whole process and try to find the ecological support of the systems by means of practice that keep or recover the physical, chemical and biological ground fertilities. The pointers identification diagnosis was made with the participation of agriculturists in the cities of TauÃ, Chorà and MassapÃ. The selected pointers were chemical quality: total organic carbon (COT), stratification rate of the COT, exchangeable average rates of Ca2+, Mg2+, K+, available phosphorus (P), cationic exchange capacity (CTC) and pH values of the ground; physical quality: ground density, macro and microporosity, and humidity retention; and biological quality: diversity, abundance, richness, Shannon and Pielouâs indices of ground epigenetic fauna. Four areas were evaluated to test them: two under system of production in agroecolÃgicas bases belonging to the agriculturists Josà Eduardo Sobrinho (JESA) and Raimundo Valentim de Sousa (RVSA) and two other areas, being one under natural vegetation (JESN) and another one under traditional culture (RVST) belonging respectively to the same agriculturists. These areas are located in the city of TauÃ, CearÃ. With the achieved results, one has concluded that farmers that adopt the production systems in agroecolÃgicas bases are capable to identify supportive pointers in its areas at different aspects considered in the context of support â ground (ambient), social and economic, and that the chemical, physical and biological qualities of the ground in the area JESA have been superior than in the area JESN. On the other hand, the chemical, physical and biological qualities in the areas RVSA and RVST were similar.

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