Thesis (M.S.)--Ohio State University, 2009. / Title from first page of PDF file. Includes vita. Includes bibliographical references (p. 68-76).

Thesis (M.S. in Soil Science)--Washington State University. / Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1956. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 87-90).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1962. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 53-54). Also available via the Internet.

No description available.

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Orientador: Raimundo Leite Cruz / Resumo: A batata é uma cultura que tem desenvolvimento e produtividade intensamente influenciados pelas condições de umidade do solo, assim, o controle da umidade do solo é decisivo para o êxito desta cultura. O presente trabalho de pesquisa foi conduzido em área aberta, de agosto a novembro do ano 2001, no Departamento de Engenharia Rural da Faculdade de Ciências Agronômicas da Universidade Estadual Paulista, Botucatu-SP, objetivando avaliar os efeitos da irrigação por gotejamento superficial e subsuperficial associadas a fertirrigação e dois tipos de plantio na produtividade de batata, cultivar Aracy (IAC-2). O delineamento experimental utilizado foi em blocos ao ocaso em esquema fatorial 22, com 2 sistemas de irrigação: Irrigação por gotejamento, superficial e subsuperficial; 2 sistemas de plantio: Plantio Tradicional (PT), e Fileiras Duplas (FD); com 5 repetições perfazendo um total de vinte parcelas. A parcela experimental do tipo PT teve uma área útil de 7,2m2 e o tipo FD 6,0m2. O tubo gotejador, nos tratamentos de irrigação por gotejamento subsuperficial, foi enterrado a uma profundidade de 0,30m. Verificou-se na irrigação por gotejamento superficial, que utilizando uma pressão de 70kPa, a vazão média por gotejador foi de 0,68L.h-1, e a uniformidade de distribuição da água do sistema de 94,65%. O valor médio de consumo total de água foi de 218,29mm, o que correspondeu a um consumo médio de 2,30mm.dia-1 durante o ciclo da cultura. Após a colheita avaliou-se a produção total comercial obtendo-se uma produtividade média de 32,51t.ha-1, os tratamentos revelaram uma produtividade média de 30,46; 32,03; 33,46; e34,09t.ha-1, para T1(Plantio tradicional e irrigação por gotejamento superficial), T2(Plantio tradicional e irrigação por gotejamento subsuperficial), T3(Plantio fileira dupla e irrigação por gotejamento superficial) e T4... (Resumo completo, clicar acesso eletrônico abaixo). / Abstract: The potato is a crop that has development and high productivity influenced by the ground humidity conditions, thus, the humidity control of the ground is decisive for the success of this crop. The present work, was conducted in a opened area, from august to november of 2001, at the Department of Agricultural Engineering of the Faculdade de Ciências Agrárias- UNESP/Botucatu-SP, aiming to evaluate the effect of the irrigation for superficial and subsurface dripping associated to the fertirrigation and two types of plantation on the potato productivity, cultivar Aracy (IAC-2). The experimental delineation was experimental blocks in factorial project type 22, with 2 irrigation systems: Dripping, superficial and subsurface; 2 systems of plantation: Traditional Plantation (PT), and Double Lines (FD); with 5 repetitions totalizing twenty parcels. The PT experimental parcel had a useful area of 7,2m2 and FD type 6,0m2. The trickle pipe in the irrigation treatments for subsurface dripping, was buried to a depth of 0,30m. It was verified that the irrigation for superficial dripping, using a pressure of 70 kPa, the trickle average outflow of 0,68L.h-1, and the water distribution uniformity system of 94,65%. The average of total water consumption was of 218,29mm, with corresponded to an average consumption of 2,30 mm during the cycle of the culture. After the harvest the average total commercial production evaluated was 32,51t ha-1, the treatments revealed an average productivity of 30,46; 32,03; 33,46; and 34,09t.ha-1, for T1, T2, T3 and T4, respectively. It had a trend for bigger productivities when the plantation was carried through in FD system, when compared with the PT, with a difference of 8,1%. The total average production of bulbs dry matter was of 20,87 %. The results indicate that the productivity of this crop, were influenced by the double lines plantation system and by the density of... (Complete abstract, click electronic address below). / Mestre

Made available in DSpace on 2014-06-11T19:24:44Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-07-22Bitstream added on 2014-06-13T20:12:55Z : No. of bitstreams: 1 garcia_el_me_botfca.pdf: 913637 bytes, checksum: ba7a54ec3c0db0e89c7d86fe40d4d7b5 (MD5) / O mercado de amido vem crescendo e se aperfeiçoando nos últimos anos, levando à busca de produtos com características específicas que atendam as exigências industriais. No presente trabalho objetivou-se avaliar a composição físico-química de tubérculos de batata e suas potencialidades industriais. Foram avaliadas oito cultivares: Beacon Chipper, BRS Ana, Colorado, Harley Beckhell, Marcy, Marlen, Pirassu e Snowden, cultivadas no município de Pouso Alegre/MG safra 2011. Os tubérculos foram caracterizados segundo os valores encontrados para teor de umidade, cinzas, proteína, fibra, matéria graxa, açúcares, amido, pH, acidez titulável e cor da casca e da polpa. Após a caracterização dos tubérculos, realizou-se a extração do amido e este foi avaliado quanto a composição centesimal, propriedades de pasta, propriedades térmicas, teor de minerais (P, K, Ca e Mg), teor de amilose aparente, pH e acidez titulável. Na caracterização da coloração dos tubérculos a cultivar Beacon Chipper apresentou maior brilho e maior intensidade do componente de cor amarela (b* positivo), as cultivares BRS Ana e Pirassu apresentaram os maiores valores para o componente de cor vermelha (a* positivo). As cultivares BRS Ana e Harley Beckhell apresentaram o maior teor de matéria seca. O maior e menor rendimento de extração de amido foi obtido com a cultivar Harley Beckhell e Colorado, respectivamente. O amido extraído dos tubérculos apresentou alto grau de pureza e a cultivar Beacon Chipper apresentou o menor teor de amilose aparente. O teor de fósforo foi elevado para as cultivares Marcy e Harley Beckhell, já para as cultivares BRS Ana e Pirassu o teor desse mineral foi menor. Nas propriedades de pasta a cultivar Marcy apresentou valores elevados para viscosidade máxima, quebra de viscosidade e tendência a retrogradação, que são... / The starch market has been growing and improving in recent years, leading to a search for products with specific characteristics that meet the industrial requirements. This work aimed to evaluate the physical and chemical composition of potato tubers (Solanum tuberosum L.) and its industrial potential. Eight cultivars were evaluated: Snowden, Harley Beckhell, Marlen, Colorado, BRS Ana, Pirassu, Beacon Chipper and Marcy grown in Pouso Alegre, Minas Gerais state, in 2011. Tubers were characterized to the moisture, ash, protein, fiber, lipids, sugars, starch, pH, titratable acidity and color of the peel and pulp. After characterization of the tubers, held the extraction of starch and this was evaluated for proximate composition, pasting properties, thermal properties, mineral content (P, K, Ca and Mg), content of apparent amylose, pH and titratable acidity . In characterizing the color of the tubers to cultivar Beacon Chipper showed higher brightness and greater intensity of the yellow color component (b* positive), the cultivars BRS Ana and Pirassu showed the highest values for the red color component (a* positive). The cultivars BRS Ana and Harley Beckhell showed the highest dry matter content. The highest and lowest... (Complete abstract click electronic access below)

Thesis (MTech (Agriculture))--Cape Peninsula University of Technology, 2014. / Plants require nitrogen (N) to support desired production levels. Nitrogen fertilization strategy is a major consideration in field management with regard to achieving both economic and environmental objectives. For instance, in potato, insufficient N supply reduces tuber size and overall yield while excessive N supply can reduce tuber quality and increase environmental risk through nitrate (NO3-) leaching and nitrous oxide emission. Selection of an adequate N fertilizer application rate for crops is difficult, due to marked variations in soil N supply and crop N demand in both the field and over time. This research was conducted to characterise the ammonium transporter gene (AMT1) of Bambara groundnut and potato using molecular biology and bioinformatics methods. Nucleotide database sequences were used to design AMT1-specific primers which were used to amplify and sequence the core-region of the gene from Bambara groundnut and potato. Bioinformatics techniques were used to predict the structure and infer properties of the proteins. Nucleotide sequence alignment and phylogenetic analysis indicate that BgAMT1 and PoAMT1 are indeed from the AMT1 family, due to the clade and high similarity they respectively shared with other plant AMT1 genes. Amino acid sequence alignment showed that BgAMT1 is 92%, 89% and 87% similar to PvAMT1.1, GlycineAMT1 and LjAMT1.1 respectively, while PoAMT1 is 92%, 83% and 76% similar to LeAMT1.1, LjAMT1.1 and LeAMT1.2 respectively. BgAMT1 and PoAMT1 fragments were shown to correspond to the 5th - 10th transmembrane spanning-domains. Mutation of Bg W1A-L and S28A (for BgAMT1) and Po S70A (for PoAMT1) is predicted to enhance ammonium (NH4+) transport activity. Residues Bg D23 (for BgAMT1) and Po D16 (for PoAMT1) must be preserved otherwise NH4+ transport activity is inhibited. In all, BgAMT1 and PoAMT1 play a role in N uptake from the root while BgAMT1 may contribute more in different steps of rhizobia interaction. In an investigation of the correlation between AMT1 gene expression levels and leaf chlorophyll content index (CCI) with plant N status, potato plants were grown in a hydroponic greenhouse with 0.75 or 7.5 mM NO3- and 0.75 or 7.5 mM NH4+ as forms of N supply in a completely randomized design. Leaf CCI as measured by chlorophyll content meter, showed that an increase in N supply results in increased leaf CCI in response to both forms of N. Total RNA was isolated from leaf sampled at 28 days after treatment and expression level of the AMT1 gene was determined by reverse transcription-qPCR using a second set of primers designed for qPCR. The results showed that expression levels of AMT1 increased from 8.731 ± 2.606 when NO3- supply was high to 24.655 ± 2.93 when NO3- supply was low. However, there was no significant response in AMT1 expression levels to changes in NH4+. This result suggested that AMT1 transports NO3- less efficiently than NH4+, and thus more transport channels are required in the cell membrane when NO3- levels are low. Such variation in AMT1 expression levels are not necessary for NH4+ transport since the transport mechanism for NH4+ is efficient even at low NH4+ levels.