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Thesis (Ph. D.)--University of California, Davis, 1987. / Includes bibliographical references (leaves 237-253).

Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xv, 176 p.; also includes graphics (some col.) Includes bibliographical references (p. 169-176). Available online via OhioLINK's ETD Center

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Orientador: Hélio Grassi Filho / Banca: Antonio Evaldo Klar / Banca: Edson Luiz Furtado / Resumo: O presente trabalho objetivou estudar os efeitos de uma nova técnica de aplicação de fungicida , através da água de irrigação pelo sistema localizado (gotejamento), na cultura do tomate híbrido "Debora Plus" em ambiente protegido, no controle da doença causada pelo fungo Septoria lycopersici Sepg., comparado com a aplicação convencional (pulverização). Essa nova técnica se chama "Fungigação". Além de estudar a comparação dos tipos de aplicação, foi estudado também 6 (seis) doses do fungicida benomyl na fungigação. As doses utilizadas foram: 75% a menos que a dose recomendada (59,5 mg/vaso), 50% a menos que a dose recomendada (119,0 mg/vaso), 25% a menos que a dose recomendada (178,5 mg/vaso), 100% da dose recomendada (238,0 mg/vaso), 25% a mais que a dose recomendada (297,5 mg/vaso) e 50% a mais que a dose recomendada (357,0 mg/vaso). As doses utilizadas nas aplicações por pulverização, foram de 100% da dose recomendada pelo fabricante (238,0 mg/vaso). Também foram avaliados os números de frutos colhidos, a massa fresca e seca dos mesmos e a altura das plantas comparando-os pelos tipos de tratamentos recebidos. A fungigação foi feita semanalmente, dando um total de 17 (dezessete) aplicações, as pesagens dos frutos foi feita semanalmente, dando um total de 10 (dez) pesagens e as medições da altura da planta do tomateiro quinzenalmente, dando um total de 5 (cinco) medições. Foi adotado o delineamento em blocos casualizados com oito tratamentos e cinco repetições. Pode-se observar que pelos resultados obtidos no presente trabalho que a aplicação convencional do benomyl para controle da septoriose do tomateiro mostrou-se superior à fungigação; não houve também diferença significativa nas diferentes dosagens do produto na fungigação, mas houve um controle da doença; a altura da planta foi praticamente igual para todos os tratamentos... (Resumo completo, clicar acesso eletrônico abaixo). / Abstract: The aim of this study was to verify the efects of a new technic of fungicides aplication, through water from irrigation by the localized system (leaking), in hybrid tomatoes cultivation "Debora Plus" in protected environment, to control the diseased tomatoes caused by the fungal Septoria lycopersici Sepg, comparing with the convencional aplication (spraying). This new technic is called fungigation. Above the study the comparison from kinds of aplication, was also studyed 6 (six) doses of fungicide in fungigation. The used doses were: 75% less than the recommended (59,5 mg/vase), 50% less than the recommended dose (119,0 mg/vase), 25% less than the recommended dose (178,5 mg/vase), 100% of recommended dose (238,0 mg/vase), 25% more than the recommended dose (297,5 mg/vase) and 50% more than the recommended dose (357,0 mg/vase). The used doses in aplication by spraying, were 100% of recommended dose by the industry (238,0 mg/vase). It was also avaliables the collected fruits numbers, the fresh mass, dry matter and the height plants comparing by the kind received of treatment. The fungigation was make weekly, givining in the total 17 (seventeen) aplications, the fruits weigh was make weekly, givining a total 10 (ten) weigh, and the measures of tomatoes plants height was in 15 (fifteen) days, givining a total of 5 (five) measures. It was adopted to delineate in blocks casualializated with 8 (eight) treatments and 5 (five) repetitions. It can observe by the found results in this present research that the convencional aplication of benomyl, to control the tomatoes septoriose, showing higher than fungigation; did not have significant difference in differents doses of product in fungigation, but had a tendence of desease control; the plant height was almost as equal as all the treatments, showing that as much as fungigation like in convencional spraying, did not have interference in plants growing... (Complete abstract, click electronic address below). / Mestre

Made available in DSpace on 2014-06-11T19:26:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2001-01-31Bitstream added on 2014-06-13T19:34:39Z : No. of bitstreams: 1 araujo_jpb_me_botfca.pdf: 1926201 bytes, checksum: 39fb88bb1e1d044600067546efef56fe (MD5) / O presente trabalho objetivou estudar os efeitos de uma nova técnica de aplicação de fungicida , através da água de irrigação pelo sistema localizado (gotejamento), na cultura do tomate híbrido Debora Plus em ambiente protegido, no controle da doença causada pelo fungo Septoria lycopersici Sepg., comparado com a aplicação convencional (pulverização). Essa nova técnica se chama Fungigação. Além de estudar a comparação dos tipos de aplicação, foi estudado também 6 (seis) doses do fungicida benomyl na fungigação. As doses utilizadas foram: 75% a menos que a dose recomendada (59,5 mg/vaso), 50% a menos que a dose recomendada (119,0 mg/vaso), 25% a menos que a dose recomendada (178,5 mg/vaso), 100% da dose recomendada (238,0 mg/vaso), 25% a mais que a dose recomendada (297,5 mg/vaso) e 50% a mais que a dose recomendada (357,0 mg/vaso). As doses utilizadas nas aplicações por pulverização, foram de 100% da dose recomendada pelo fabricante (238,0 mg/vaso). Também foram avaliados os números de frutos colhidos, a massa fresca e seca dos mesmos e a altura das plantas comparando-os pelos tipos de tratamentos recebidos. A fungigação foi feita semanalmente, dando um total de 17 (dezessete) aplicações, as pesagens dos frutos foi feita semanalmente, dando um total de 10 (dez) pesagens e as medições da altura da planta do tomateiro quinzenalmente, dando um total de 5 (cinco) medições. Foi adotado o delineamento em blocos casualizados com oito tratamentos e cinco repetições. Pode-se observar que pelos resultados obtidos no presente trabalho que a aplicação convencional do benomyl para controle da septoriose do tomateiro mostrou-se superior à fungigação; não houve também diferença significativa nas diferentes dosagens do produto na fungigação, mas houve um controle da doença; a altura da planta foi praticamente igual para todos os tratamentos... . / The aim of this study was to verify the efects of a new technic of fungicides aplication, through water from irrigation by the localized system (leaking), in hybrid tomatoes cultivation Debora Plus in protected environment, to control the diseased tomatoes caused by the fungal Septoria lycopersici Sepg, comparing with the convencional aplication (spraying). This new technic is called fungigation. Above the study the comparison from kinds of aplication, was also studyed 6 (six) doses of fungicide in fungigation. The used doses were: 75% less than the recommended (59,5 mg/vase), 50% less than the recommended dose (119,0 mg/vase), 25% less than the recommended dose (178,5 mg/vase), 100% of recommended dose (238,0 mg/vase), 25% more than the recommended dose (297,5 mg/vase) and 50% more than the recommended dose (357,0 mg/vase). The used doses in aplication by spraying, were 100% of recommended dose by the industry (238,0 mg/vase). It was also avaliables the collected fruits numbers, the fresh mass, dry matter and the height plants comparing by the kind received of treatment. The fungigation was make weekly, givining in the total 17 (seventeen) aplications, the fruits weigh was make weekly, givining a total 10 (ten) weigh, and the measures of tomatoes plants height was in 15 (fifteen) days, givining a total of 5 (five) measures. It was adopted to delineate in blocks casualializated with 8 (eight) treatments and 5 (five) repetitions. It can observe by the found results in this present research that the convencional aplication of benomyl, to control the tomatoes septoriose, showing higher than fungigation; did not have significant difference in differents doses of product in fungigation, but had a tendence of desease control; the plant height was almost as equal as all the treatments, showing that as much as fungigation like in convencional spraying, did not have interference in plants growing... (Complete abstract, click electronic address below).

No description available.

Ph. D.

Ph. D.

<p>Using the Ontario processed tomato industry as a case study, this dissertation examines how the situation facing hired labour in Ontario agriculture is influenced by the growth of agribusiness. The trend to mechanize harvest operations symbolizes the development of agribusiness. Explanations for changes in labour markets, labour process, and control and organization of work activity that accompany mechanization are explained with reference to established models for change in contemporary agricultural structure. The utility of these models, which include evolutionist, integrationist, and historicist perspectives, is tested with original data. In general, the evolutionist model is found to be the most satisfactory.</p> <p>Data were gathered during 1988-1989 by various methods: historical research, interviews, and participant and non-participant observation. This study concludes that, with mechanization, the farm labour market changes and takes on features similar to the labour market for work classified as unskilled and low status in non-farm industries. It is also evident that hired agricultural workers (and many of the growers who employ them) lose control over work activity and conditions when tomatoes are machine harvested. The primary benefactors from such changes are the major processing firms whose influence continues to dominate the agro-food industry.</p> <p>This investigation into hired farm labour and agribusiness is significant because it is among the first to address the situation facing hired agricultural workers in Ontario. As well, it not only adds new material to scholarly debates about changes in agricultural structure, but also contributes to Canadian political economy studies.</p> / Doctor of Philosophy (PhD)