This study attempted to examine representative soils of Denton County in an effort to determine seasonal and soil type variations in the fungous flora both quantitatively and qualitatively.

No description available.

In the glasshouse, two cultivars of alfalfa growing in non-sterile soil were evaluated for their response to inoculation with 4 VA mycorrhizal fungi and 3 strains of Rhizobium meliloti. Alfalfa cultivar Hayden PX-1 had significantly greater dry stem weights (p = 0.05) when inoculated with Glomus fasciculatum, G. deserticola or an undescribed Glomus sp. compared to mycorrhizal controls. Alfalfa cultivar Lew HI Nod had significantly less dry stem weights when inoculated with G. fasciculatum, G. mosseae or the undescribed Glomus sp. Addition to R. meliloti did not impart increased growth responses with either alfalfa cultivar probably due to the high nitrogen content of the soil. In the field, alfalfa cultivar Hayden PX-1 was both transplanted and direct-seeded. Transplanted alfalfa had been preinoculated with VA mycorrhizal fungi and R. meliloti. Inocula containing VA mycorrhizal fungi and R.meliloti were Layered below the seed in direct-seeded plots. Phosphorus, as treble super phosphate, was also added as a treatment. At first harvest, transplanted alfalfa inoculated with the undescribed Glomus sp. had significantly greater (p = 0.05) dry whole plot weights compared to controls regardless of R. meliloti or phosphorus treatments. Inoculation of alfalfa with G. deserticola significantly increased dry whole plot weights over controls but significantly (p = 0.05) only with added R. meliloti and phosphorus. Second harvest data maintained the trend for yield increases over controls with addition of the undescribed Glomus sp. and G. deserticola; however, only significantly (p = 0.05) with inoculation with the undescribed Glomus sp. including R. meliloti and phosphorus. Yield increases were not obtained for the final three transplanted alfalfa harvests or for any of the direct-seeded alfalfa harvests. Statistically significant differences in phosphorus and protein content of alfalfa were not found between any of the treatments. Also, differences were not found in soil populations of R. meliloti in mycorrhizal inoculated plots compared to control plots.

Bibliography: leaves 71-79. Almost 80 percent of plant taxa develop vesicular-arbuscular mycorrhizae (VAM) which are symbiotic associations between plant roots and soil fungi. The fungi are biotropic-obligate symbionts. Identification of VAM fungi is currently based on spore characteristics. Molecular techniques provide tools for better and more accurate identification of species, as well as for the examination of genetic variability occuring between individual spores of a single species.

Thesis (MSc)--University of Stellenbosch, 2008. / Bibliography. Also available via the Internet.

Thesis (Ph.D.) -- University of Adelaide, Dept. of Plant Pathology, 1966. / Typescript. Includes bibliographical references.

Thesis (M.S.)--Southern Oregon University, 2005. / "A thesis submitted to ... Southern Oregon University in partial fulfillment of the requirements for the degree of Master of Science ..." Includes bibliographical references (leaves 101-109). Also available via Internet as PDF file through Southern Oregon Digital Archives: http://soda.sou.edu. Search Bioregion Collection.

Thesis (Ph. D.)--University of Canterbury, 2010. / Typescript (photocopy). Includes bibliographical references (p. 231-255). Also available via the World Wide Web.

Made available in DSpace on 2014-06-11T19:35:16Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-07-31Bitstream added on 2014-06-13T20:06:58Z : No. of bitstreams: 1 silva_ea_dr_ilha.pdf: 796725 bytes, checksum: 88d835150a4d717b29f645c6af744ff6 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Os solos de regiões tropicais apresentam alta capacidade de fixação de fósforo, processo que resulta na sua baixa disponibilidade para as plantas. Como o fósforo nas culturas é indispensável, justificam-se estudos relacionados à maximização do aproveitamento do fósforo não lábil do solo por meio de microrganismos solubilizadores de fosfato e fungos micorrízicos arbusculares. O objetivo do presente trabalho foi de averiguar os efeitos de Aspergillus niger Tiegh e de Glomus clarum Nicol. & Schenck em dois latossolos com diferentes teores de óxidos de ferro e alumínio e no crescimento de Urochloa brizantha (Hochst. ex A. Rich.) Stapf, visando o aproveitamento do fósforo não lábil do solo. O experimento foi conduzido em condições naturais de luz e temperatura, com solo não esterilizado, empregando vasos plásticos com capacidade para 30 dm3 de solo. O delineamento experimental utilizado foi inteiramente casualizado, com 6 repetições e esquemas fatoriais diferenciados. Para as variáveis da caracterização química do solo e as variáveis microbiológicas do solo utilizou-se o fatorial 5x2x7, correspondendo aos tratamentos: épocas, solos e inoculação com 5, 2 e 7 níveis, respectivamente. Os níveis de épocas foram: 0, 90, 180, 270 e 360 dias após o corte de uniformização e os níveis de solo foram LVdA e LVd1. O tratamento inoculação contou com os níveis: controle fosfatado, controle não fosfatado, A. niger 19, A. niger 26, G. clarum, G. clarum + A. niger 19, G. clarum + A. niger 26. Fósforo total, fósforo inorgânico e fósforo orgânico foram avaliados no esquema fatorial 2x2x7 com os mesmos tratamentos do esquema anterior, porém com apenas dois níveis para épocas: 180 e 360 dias. O fósforo disponível total e o fósforo não lábil foram analisados no esquema fatorial 2x7 ao final do experimento com os níveis de solo e inoculação... (Resumo completo, clicar acesso el / The tropical soils have high phosphorus fixation capacity, a process that results in low availability to plants. As the phosphor in the cultures is essential, justifies related studies to maximize the use of non-labile soil phosphorus by phosphate solubilizing microorganisms and arbuscular mycorrhizal fungi. The aim of this study was to investigate the effects of Aspergillus niger and Glomus clarum Tiegh Nicol. & Schenck in two soils with different levels of iron and aluminum oxides, and the growth of Urochloa brizantha (Hochst. ex A. Rich.) Stapf, targeting the use of non-labile soil phosphorus. The experiment was conducted under natural conditions of light and temperature, with non-sterile soil, using plastic pots with a capacity of 30 dm3 of soil. The experimental design was completely randomized with six replications and differentiated factorial schemes. The variables for the soil chemical and microbiological characterization were analyzed in the 5x2x7factorial scheme, corresponding to the treatments: time, soil and inoculation, with 5, 2 and 7 levels, respectively. The levels of time were 0, 90, 180, 270 and 360 days after the uniformity cut, and the soil were LVdA and LVd1. The inoculation treatment levels included: control phosphate, no phosphate control, A. niger 19, A. niger 26, G. clarum, G. clarum + A. niger 19 and A. niger 26+G. clarum. Total phosphorus, inorganic and organic phosphorus were evaluated in a 2x2x7 factorial, with the same treatments as the previous scheme, but with only two levels for time: 180 to 360 days. The total available phosphorus and the non-labile phosphorus were analyzed in a 2x7 factorial scheme, at the end of the experiment, using the same levels of soil and inoculation as described. The plant variables were analyzed in a 2x7 factorial with the same levels of soils and inoculation... (Complete abstract click electronic access below)

Orientador: Ana Maria Rodrigues Cassiolato / Banca: katia Luciene Maltoni / Banca: Francisco Maximino Fernandes / Banca: Júlio César Lima Neves / Banca: Edson Luiz Souchie / Resumo: Os solos de regiões tropicais apresentam alta capacidade de fixação de fósforo, processo que resulta na sua baixa disponibilidade para as plantas. Como o fósforo nas culturas é indispensável, justificam-se estudos relacionados à maximização do aproveitamento do fósforo não lábil do solo por meio de microrganismos solubilizadores de fosfato e fungos micorrízicos arbusculares. O objetivo do presente trabalho foi de averiguar os efeitos de Aspergillus niger Tiegh e de Glomus clarum Nicol. & Schenck em dois latossolos com diferentes teores de óxidos de ferro e alumínio e no crescimento de Urochloa brizantha (Hochst. ex A. Rich.) Stapf, visando o aproveitamento do fósforo não lábil do solo. O experimento foi conduzido em condições naturais de luz e temperatura, com solo não esterilizado, empregando vasos plásticos com capacidade para 30 dm3 de solo. O delineamento experimental utilizado foi inteiramente casualizado, com 6 repetições e esquemas fatoriais diferenciados. Para as variáveis da caracterização química do solo e as variáveis microbiológicas do solo utilizou-se o fatorial 5x2x7, correspondendo aos tratamentos: épocas, solos e inoculação com 5, 2 e 7 níveis, respectivamente. Os níveis de épocas foram: 0, 90, 180, 270 e 360 dias após o corte de uniformização e os níveis de solo foram LVdA e LVd1. O tratamento inoculação contou com os níveis: controle fosfatado, controle não fosfatado, A. niger 19, A. niger 26, G. clarum, G. clarum + A. niger 19, G. clarum + A. niger 26. Fósforo total, fósforo inorgânico e fósforo orgânico foram avaliados no esquema fatorial 2x2x7 com os mesmos tratamentos do esquema anterior, porém com apenas dois níveis para épocas: 180 e 360 dias. O fósforo disponível total e o fósforo não lábil foram analisados no esquema fatorial 2x7 ao final do experimento com os níveis de solo e inoculação... (Resumo completo, clicar acesso el / Abstract: The tropical soils have high phosphorus fixation capacity, a process that results in low availability to plants. As the phosphor in the cultures is essential, justifies related studies to maximize the use of non-labile soil phosphorus by phosphate solubilizing microorganisms and arbuscular mycorrhizal fungi. The aim of this study was to investigate the effects of Aspergillus niger and Glomus clarum Tiegh Nicol. & Schenck in two soils with different levels of iron and aluminum oxides, and the growth of Urochloa brizantha (Hochst. ex A. Rich.) Stapf, targeting the use of non-labile soil phosphorus. The experiment was conducted under natural conditions of light and temperature, with non-sterile soil, using plastic pots with a capacity of 30 dm3 of soil. The experimental design was completely randomized with six replications and differentiated factorial schemes. The variables for the soil chemical and microbiological characterization were analyzed in the 5x2x7factorial scheme, corresponding to the treatments: time, soil and inoculation, with 5, 2 and 7 levels, respectively. The levels of time were 0, 90, 180, 270 and 360 days after the uniformity cut, and the soil were LVdA and LVd1. The inoculation treatment levels included: control phosphate, no phosphate control, A. niger 19, A. niger 26, G. clarum, G. clarum + A. niger 19 and A. niger 26+G. clarum. Total phosphorus, inorganic and organic phosphorus were evaluated in a 2x2x7 factorial, with the same treatments as the previous scheme, but with only two levels for time: 180 to 360 days. The total available phosphorus and the non-labile phosphorus were analyzed in a 2x7 factorial scheme, at the end of the experiment, using the same levels of soil and inoculation as described. The plant variables were analyzed in a 2x7 factorial with the same levels of soils and inoculation... (Complete abstract click electronic access below) / Doutor