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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

Efeito do pr?-cultivo de adubos verdes na produ??o org?nica de br?colos (Brassica oleraceae var. italica) em sistema de plantio direto. / Effects of cover crop as green manure on Broccoli (Brassica oleraceae L. var. Italica Plenk) in no-tillage system.

Silva, Vinicius Vitoi 22 March 2002 (has links)
Made available in DSpace on 2016-04-28T14:58:37Z (GMT). No. of bitstreams: 1 2002 - Vinicius Vitoi Silva.pdf: 1054315 bytes, checksum: 51a5727d70f7700de341d0a3b25059da (MD5) Previous issue date: 2002-03-22 / This study was carried out under field conditions at the Agroecological Integrated Production System (AIPS) to chose the best option of cover crop to much the soil suface for broccoli organic managed in no-tillagem systems. The experiment was set in a randomized blocks design with four treatments during two years in the same field location. In the first year the treatment used was, sorghum; millet; sum hemp and weeds as control. In the second year was replaced to a misture sum hamp and sorghum to optimize the benefits of utilization of legume. The cover crop was cut and left in the soil surface as mulch to provide a thick residue that release nutrients and suppress growth of weeds and prove a best environment to broccoli development. This study included evaluation relating with biomas production, concentration and accumulation of nutrients at cover crop; decomposition rates and nutrients released at straws; weed community before and after cover crop was cut; broccoli marketable production and nutrients concentration at index leaves of broccoli. Sorghum; millet; sum hemp and sorghum plus sum hemp mixture production of straw was plus than 7,0 Mg ha-1 dry mass and proved a good much with the slowest decompositions rates. The decomposition rate and nutrient release rate was fast in weeds and slower in grass than legume. The mixture grass-legume has a intermediate rate whem is compared with sorghum and sun hemp monoculture. Legume accumulation plus Ca and grass plus K and P. The faster nutrient releases from mulch was K and the lowest was Ca, while N, P and Mg was variable among treatments. Legume grass mixture can improve quality of mulch because they have different root ability to nutrient up take. The straws of sorghum, millet, sum hemp and sorghum plus sum hemp mixture restring weed growth and show that is possible to reduce additional control measures. The index leaves of broccoli was able to show differences in nutrients up take only to K at the first year, when it was higher in broccoli planted in millet and sorghum residues, but at the second year N and P was higher in leaves of broccoli planted in sum hemp and mixture of sorghum plus sum hemp residue. At the broccoli marketable yield was better in cover crop than weeds. In the second year the mixture grass-legume effect in broccoli growth was similar to legume alone. / Foi conduzido um estudo de campo no Sistema Integrado de Produ??o Agroecol?gica (SIPA) com o objetivo de identificar a melhor op??o de planta de cobertura para produ??o de Br?colos (Brassica oleraceae L., var. italica) em Sistema Plantio Direto. Foi utilizado o delineamento experimental de blocos ao acaso com quatro repeti??es e quatro tratamentos e utilizado a mesma localiza??o no campo durante os dois anos. No primeiro experimento os tratamentos foram sorgo, milheto, crotal?ria e vegeta??o espont?nea como testemunha. No segundo experimento o tratamento com milheto foi substitu?do pelo cons?rcio entre sorgo e crotal?ria para otimizar o benef?cio da leguminosa. A cultura de cobertura foi cortada e deixada na superf?cie para forma a espessa camada de palha que libera nutriente, impede o crescimento de ervas e proporciona melhora ambiente para o crescimento do br?colo. O estudo incluiu a avalia??o da produ??o de fitomassa, teor e acumula??o de nutrientes nas plantas de cobertura; taxas de decomposi??o e libera??o de nutrientes da palhada; comunidade de plantas espont?neas antes e ap?s o corte das plantas de cobertura; produ??o comercial de br?colos e o teor de nutrientes na folha ?ndice do br?colos. Sorgo, milheto, crotal?ria e cons?rcio produziram acima de 7,0 Mg ha-1 de mat?ria seca proporcionando boa cobertura do solo cujas taxas de decomposi??o foram mais lentas. A decomposi??o e libera??o de nutrientes foi mais r?pida na vegeta??o espont?nea que nas gram?neas e leguminosa. O cons?rcio entre sorgo e crotal?ria apresentou taxa de decomposi??o intermedi?ria entre os valores observados nos tratamentos sorgo e crotal?ria solteiros, mas a libera??o de nutriente foi semelhante. A leguminosa acumulou maiores quantidades de N e Ca enquanto as gram?neas mais K e P. O nutriente K apresentou a maior velocidade de libera??o e Ca a menor velocidade de libera??o em todos tratamentos, enquanto N, P e Mg variaram entre tratamentos. O cons?rcio entre gram?nea e leguminosa melhora a qualidade da palhada devido a diferen?as na absor??o de nutrientes. A palhada de sorgo, milheto, crotal?ria e o cons?rcio crotal?ria e sorgo restringiram o estabelecimento de plantas espont?neas mostrando a viabilidade de reduzir a intensidade e freq??ncia de capinas. A folha ?ndice do br?colos identificou diferen?a na absor??o de nutrienntes apenas para o K no primeiro ano, quando foi maior no br?colos cultivado sobre res?duos de milheto e sorgo. No segundo ano o teor de N e P na folha ?ndice foi maior no br?colos cultivado sobre res?duos de crotal?ria e do cons?rcio. No primeiro ano todas as plantas de cobertura proporcionaram produ??o comercial de br?colos superior em rela??o ao controle com plantas espont?neas. No segundo ano o efeito dos res?duos de crotal?ria + sorgo proporcionou produ??o comercial semelhante ao melhor resultado que foi obtida sobre res?duos de crotal?ria solteira.
2

O uso da agricultura org?nica na educa??o ambiental: Uma proposta interdisciplinar no curso t?cnico em agropecu?ria / Use of organic agriculture in environmental education: a proposal on technical interdisciplinary course in agricultural

PEREIRA, S?lvia Maria de S? Barreto 16 December 2015 (has links)
Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-06-13T17:39:14Z No. of bitstreams: 1 2015 - S?lvia Maria de S? Berreto Ferreira.pdf: 907631 bytes, checksum: 83122d961d78c54fedee1df798feecab (MD5) / Made available in DSpace on 2017-06-13T17:39:14Z (GMT). No. of bitstreams: 1 2015 - S?lvia Maria de S? Berreto Ferreira.pdf: 907631 bytes, checksum: 83122d961d78c54fedee1df798feecab (MD5) Previous issue date: 2015-12-16 / de Janeiro PPGEA/UFRRJ. Serop?dica/RJ, 2015. Under the picture of the use of organic agriculture to the work of interdisciplinarity, the food culture with its great importance for family farming (which provide the support of the majority of rural households) and knowing that school gardens have a role fundamental, both aesthetically, pedagogical, educational point of view also functions as a space of discovery and direct learning many subjects that are covered in the classroom. From this perspective it appears that an organic garden at school Agricultural Dom Augustine Ikas, with the participation of the whole school community. Conforming so, the study leaning out the possibility of growing a vertical garden as a teaching tool, with high school students and technical federal schools. This research aimed to identify the concept of organic agriculture as interdisciplinary approach to environmental education, gathering data to demonstrate the relevance of the subject and enables the work of environmental education as a transdisciplinary element in the curriculum of courses, discussing sustainability from development this garden vegetables and rescuing species from the city of S?o Louren?o da Mata. For this work we were used plastic bottles of 2 liters in the form of suspended planters (vertical planting). The substrate used was humos earthworm, Eisenia andrei, and topsoil. During the deployment and development of vegetables, which showed biological cycle of approximately 90 days, a great interest of the student body and teaching was observed in furthering the teaching-learning about sustainability from the concrete reality of the construction of the organic garden within a small urban space. / Sob o panorama do uso da agricultura org?nica para o trabalho da interdisciplinaridade, e do cultivo de alimentos com sua grande import?ncia para a atividade agr?cola familiar (que proporcionam o sustento da maioria das fam?lias rurais). Sobretudo, sabendo-se que as hortas escolares possuem um papel fundamental, tanto do ponto de vista est?tico, pedag?gico, educativo tamb?m funciona como um espa?o de descoberta e aprendizagem direta de muitas mat?rias que s?o abordadas na sala de aula. Nessa perspectiva ? que surge uma horta org?nica no col?gio Agr?cola Dom Agostinho Ikas, com a participa??o de toda a comunidade escolar. Conformando assim, o estudo debru?ado na possibilidade de cultivo a uma horta vertical, como uma ferramenta did?tica, com os estudantes do Ensino M?dio e T?cnico da Rede Federal de Ensino. Esta pesquisa teve como objetivos identificar o conceito da agricultura org?nica como conhecimento interdisciplinar para a educa??o ambiental, reunindo dados que demonstrem a relev?ncia do tema e possibilite ao trabalho da Educa??o Ambiental como elemento transdisciplinar na grade curricular dos cursos, discutindo a sustentabilidade a partir do desenvolvimento desta horta e resgatando esp?cies hort?colas oriundas no munic?pio de S?o Louren?o da Mata. Para a realiza??o deste trabalho foram utilizadas garrafas pets de 2 litros em forma de jardineiras suspensas (plantio verticalizado). O substrato utilizado foi humos de minhoca, Eisenia andrei,e terra vegetal. Durante a implanta??o e o desenvolvimento das hortali?as, que apresentaram ciclo biol?gico de aproximadamente 90 dias, foi observado um grande interesse do corpo discente e docente em aprofundar o processo de ensino-aprendizagem sobre sustentabilidade a partir da realidade concreta da constru??o da horta org?nica dentro de um pequeno espa?o urbano

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