Submitted by Gabriela Lopes (gmachadolopesufpel@gmail.com) on 2016-09-28T13:01:08Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese Gerson Kleinick Vignolo Final.pdf: 1485427 bytes, checksum: 22bb207b736300635f678cd9543f64a0 (MD5) / Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2016-09-28T17:23:01Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese Gerson Kleinick Vignolo Final.pdf: 1485427 bytes, checksum: 22bb207b736300635f678cd9543f64a0 (MD5) / Made available in DSpace on 2016-09-28T17:23:01Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese Gerson Kleinick Vignolo Final.pdf: 1485427 bytes, checksum: 22bb207b736300635f678cd9543f64a0 (MD5) Previous issue date: 2015-05-25 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / O estudo teve como objetivo avaliar a produção e qualidade de frutas de morangueiro durante dois ciclos consecutivos em função da data de poda, filme do túnel baixo e cor do mulching plástico. Foram conduzidos dois experimentos no município de Pelotas-RS, em área experimental pertencente a Embrapa Clima Temperado (CPACT), durante os anos de 2011/2012 e 2012/2013, intitulados: (1) Produção e qualidade de frutas de 'Aromas' e 'Albion' durante dois ciclos consecutivos sob influência da data de poda de plantas de morangueiro; (2) Produção e qualidade de morangos durante dois ciclos consecutivos sob influência do filme do túnel baixo e cor do mulching plástico. Os experimentos foram realizados em sistema de cultivo convencional utilizando túnel baixo e mulching plástico. As mudas, oriundas da Argentina, foram transplantadas no inicio de julho, colhendo-se as frutas até novembro do ano seguinte, totalizando 17 meses de ciclo. Os fatores avaliados no experimento 1 foram as cultivares (Aromas e Albion) e datas de poda (1° e 15 de março e abril, além de plantas sem poda). No experimento 2, avaliaramse o filme do túnel baixo (túnel transparente todo ciclo; túnel leitoso todo ciclo; túnel transparente durante outono/inverno/primavera e leitoso no verão) e cor do mulching plástico (branco, prata e preto). Nos dois experimentos, foram analisados parâmetros de desenvolvimento das plantas e de produção e qualidade de frutas. No presente estudo, pode-se concluir que entre as cultivares testadas, a cultivar Aromas mostrou-se melhor alternativa de cultivo para a região de Pelotas-RS por apresentar maior produção de frutas. No entanto, as frutas de 'Albion' possuem melhor qualidade. As plantas apresentam boa produção no segundo ciclo produtivo, com a vantagem de obtenção de frutas durante meses que existe pouca oferta de morango no mercado. Em plantas sadias, não existe a necessidade de realização de poda para aumento da produção de frutas no segundo ciclo, porém observa-se melhor qualidade de fruta nas plantas podadas. Com relação à cobertura plástica, o filme do túnel baixo não influenciou a produção total de frutas, sendo recomendado o uso de túnel transparente por proporcionar maiores teores de sólidos solúveis e antocianinas que o túnel leitoso. Por outro lado, a produção de frutas foi fortemente influenciada pela cor do mulching plástico, verificando-se que o mulching branco propicia aumento da produção e qualidade de frutas comparativamente ao mulching preto que é utilizado pela maioria dos produtores. / The study aimed to evaluate the production and fruit quality of strawberry during two consecutive seasons according to the date of pruning, film of low tunnel and color of plastic mulching. Two experiments were conducted in Pelotas, Brazil, at Embrapa Clima Temperado (CPACT), in the years 2011/2012 and 2012/2013, entitled: (1) Production and fruit quality of 'Aromas' and 'Albion' during two consecutive seasons under the influence of pruning date of strawberry plants; (2) Production and fruit quality of strawberry during two consecutive seasons under the influence of the film of low tunnel and color of plastic mulching. The experiments were performed in conventional culture system using low tunnel and plastic mulching. The plantlets from Argentina were transplanted in early July, picking the fruits until November of the following year, totaling 17 months. The factors evaluated in the first experiment were the cultivars (Aromas and Albion) and pruning dates (1st and 15th of March and April, besides control treatment without pruning plants). In the second experiment, we evaluated the film of low tunnel (transparent tunnel whole cycle; opaque tunnel whole cycle; transparent tunnel during fall / winter / spring and opaque tunnel in summer) and color of mulching plastic (white, silver and black). In both experiments, plant growth, production and fruit quality were evaluated. It was concluded that between the tested cultivars, 'Aromas' proved to be better alternative for cultivation in the Pelotas region due its higher fruit production. However, fruit of 'Albion' showed better quality. The plants have good production in the second season, with the advantage of obtaining fruit in months that there is shortage of strawberry in the market. In healthy plants, there is no need to perform pruning to increase fruit production in the second season, however there is better fruit quality in the pruned plants. Regarding the plastic cover, the film of low tunnel did not affect the total production of fruits, being recommended the use of transparent tunnel to provide higher soluble solids and anthocyanins than opaque tunnel. However, fruit production was greatly influenced by the color of mulching plastic, being observed that white mulch provides increased production and fruit quality compared to black mulch which is used by most producers.

This thesis covers two separate studies. The first study, chapter 2, was conducted to evaluate whether there are additional economic returns from producing strawberries in the high tunnel compared to the open-field in Southeast Virginia. We develop and compare budgets for eight strawberry cultivars grown in the two environments and sold under three marketing strategies (pre-pick wholesale, pre-pick retail, and U-pick). Almost all cultivars in the high tunnel generated negative net revenues regardless of the marketing strategy. In contrast, net revenues from open-field cultivars were always positive. In the second study, chapter 3, we used a fractional multinomial logit model to estimate the effect of crop revenues, input costs, and fuel ethanol production on the joint acreages planted to eight U.S major crops (barley, corn, cotton, peanuts, rice, sorghum, soybeans, and wheat). We found a positive and statistically significant marginal effect of the expected peanuts' revenue on its acreage share. The expected corn revenue had a negative average marginal effect on soybean acreage share, and the effect of expected wheat revenue was positive on cotton acreage share and negative on rice acreage share. / Master of Science / This thesis covers two separate research studies. The first study, chapter 2}, was conducted to evaluate whether growing strawberries in a simple, low-cost, and passive heat structure known as a "high tunnel" would yield more profit (the difference between total revenues and total costs) compared to growing them outside in an open-field in Southeast Virginia. We estimate and compare differences between total revenues and costs for eight strawberry cultivars grown in the two environments and sold under three marketing strategies. The first two marketing strategies involve growers harvesting strawberries themselves. They can then either retail them (farm stands, farmers' markets, or in a similar setting: pre-pick retail) or sell them in bulk to be retailed by others (pre-pick wholesale). A third marketing strategy involves consumers visiting a farm and picking their own strawberries (U-pick). Almost all cultivars grown in the high tunnel structure resulted in a loss (negative difference between total revenues and costs) regardless of the marketing strategy. In contrast, cultivars produced in the open-field always generated a profit (positive total revenues and costs difference). In the second study, chapter 3, we estimated the effect of crop revenues, input costs, and fuel ethanol production on acreages planted to eight U.S major crops (barley, corn, cotton, peanuts, rice, sorghum, soybeans, and wheat), and we considered the fact that acreages allocated to one crop affect other crops' acreages. We found that increasing the expected revenue of peanuts leads to an increase in its acreage share. Increasing the expected revenue of corn leads to a decrease in soybeans' acreage share. Finally, increasing the expected revenue of wheat leads to an increase in the cotton acreage share and a decrease in the rice acreage share.