Made available in DSpace on 2014-10-09T12:46:33Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:56:30Z (GMT). No. of bitstreams: 1 07966.pdf: 4481327 bytes, checksum: ae11c93769fa67fceb5ed128248bcacb (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP / FAPESP:00/00516-7

Made available in DSpace on 2014-10-09T12:27:16Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:57:07Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

Made available in DSpace on 2014-10-09T12:23:37Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:57:34Z (GMT). No. of bitstreams: 1 00924.pdf: 5800947 bytes, checksum: d79137f558fdee495698823e4962c631 (MD5) / Tese (Doutoramento) / IEA/T / Instituto de Fisica, Universidade de Sao Paulo - IF/USP

Submitted by Nathália Faria da Silva (nathaliafsilva.ufv@gmail.com) on 2017-06-22T13:14:25Z No. of bitstreams: 1 texto completo.pdf: 400349 bytes, checksum: 0f885d0e3e8f396e57fd90379f9b8634 (MD5) / Made available in DSpace on 2017-06-22T13:14:25Z (GMT). No. of bitstreams: 1 texto completo.pdf: 400349 bytes, checksum: 0f885d0e3e8f396e57fd90379f9b8634 (MD5) Previous issue date: 2003-02-26 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / O conhecimento do comportamento das cultivares de algodoeiro quanto à tolerância à falta ou ao excesso de boro é relevante para orientar recomendações de corretivos e fertilizantes, escolha de cultivares e programas de melhoramento genético. Assim, o objetivo deste trabalho foi avaliar o comportamento de cultivares de algodoeiro herbáceo (Gossypium hirsutum L.) em resposta a doses de boro no solo. O experimento foi conduzido na Embrapa Algodão sob condições de casa de vegetação. Adotou-se o delineamento inteiramente casualizado, com os tratamentos arranjados em esquema fatorial 6 x 5, correspondendo a 6 doses de boro (0,0; 0,5; 1,0; 1,5; 2,0; e 3,0 mg dm -3 ) e 5 cultivares de algodoeiro herbáceo (CNPA 8H, BRS Aroeira, BRS Antares, BRS Sucupira e BRS Ipê), com 3 repetições. Utilizaram-se 90 vasos de plástico com 7 dm 3 de solo cada. No dia do plantio, o solo recebeu as doses de boro na forma de H 3 BO 3 , aplicadas em solução. Adicionalmente, realizou-se a adubação básica comum a todos os tratamentos. De modo geral, as doses de boro utilizadas não influenciaram as variáveis estudadas para as condições do experimento, com exceção dos teores de boro no limbo foliar. A capacidade de utilização de boro pelas cultivares de algodoeiro apresentou a seguinte ordem: BRS Aroeira > CNPA 8H e BRS Antares > BRS Ipê e BRS Sucupira. A concentração de boro no limbo foliar aumentou linearmente para as cultivares CNPA 8H e BRS Aroeira, enquanto, que para as cultivares BRS Ipê e BRS Sucupira esse aumento foi de forma quadrático. Para a cultivar BRS Ipê o ponto de máximo para teor de boro foliar com seu respectivo valor para a dose de B adicionada foi de 48,0 mg kg -1 de B e 2,5 mg dm -3 , enquanto, que para a cultivar BRS Sucupira foi de 45,7 mg kg -1 de B e 1,5 mg dm -3 . Sintomas de deficiência de B foram observados nos tratamentos em que não se utilizou este micronutriente na adubação independente da cultivar estudada. Para as doses de B utilizadas não foram observados nas cultivares de algodão estudadas sintomas de fitotoxidade. / The knowledgement of cotton cultivars’ behaviour with respect to the tolerancy to lack or excess of boron is relevant to orient fertilizers and correctives recommendations, choose of cultivars and breeding. Then, the aim of this work was to evaluate the behaviour of upland cotton (Gossypium hirsutum L.) cultivars in answer to different boron dosages on the soil. This work was developed at Embrapa Algodão under greenhouse conditions. The experimental design adopted was completely randomized with treatments arranged in a 6 x 5 factorial, i.e., 6 boron levels (0.0, 0.5, 1.0, 1.5, 2.0, and 3.0 mg dm -3 ) applied as solution boric acid, and 5 cotton cultivars (CNPA 8H, BRS Aroeira, BRS Antares, BRS Sucupira and BRS Ipê), with 3 replications. Ninety plastic containers with 7 dm 3 of soil were used. In general, the boron dosages used did not present difference at the studied variables into the experiment conditions, excepting to the leaf boron levels. The boron usage capability by the cotton cultivars were as follows: BRS Aroeira > CNPA 8H and BRS Antares > BRS Ipê and BRS Sucupira. Leaf boron level increased linearly in cultivars CNPA 8H and BRS Aroeira while for cultivars BRS Ipê and BRS Sucupira the effect was quadratic. To BRS Ipê cultivar, the highest boron level and its respective dosage added to the soil were 48,0 mg kg -1 and 2,5 mg dm -3 respectively, while BRS Sucupira values were 45,7 mg kg -1 and 1,5 mg dm -3 . Symptoms of boron deficiency were observed in treatments which did not receive the nutrient, independent of the cultivar. Were not observed toxity by the cotton plants studied using the boron dosages of this work.

Made available in DSpace on 2014-10-09T12:53:29Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:59:04Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

Made available in DSpace on 2014-10-09T12:34:02Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:59:36Z (GMT). No. of bitstreams: 0 / Tese (Doutoramento) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

Made available in DSpace on 2014-10-09T12:41:31Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:59:54Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Made available in DSpace on 2014-10-09T12:37:43Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:00:16Z (GMT). No. of bitstreams: 1 05383.pdf: 5069239 bytes, checksum: 7eb90d0ab97b4fe286a135fef870f96f (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

Made available in DSpace on 2014-10-09T12:34:36Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:00:37Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP