74 resultados para STICHODACTYLA HELIANTHUS


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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Agronomia (Proteção de Plantas) - FCA

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Pós-graduação em Agronomia (Agricultura) - FCA

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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The study was conducted in two different locations in South Brazil, in tillage in the 2009/2010 season on eight sunflower hybrids, aiming to determine the path correlations and coefficients between primary and secondary characters on the main variable of achene productivity. The correlations were similar between environments. The characters of the head diameter and mass of a thousand achenes had a significant influence on sunflower productivity. Based on the magnitude of the direct and indirect effects, we highlighted all primary components on the main variable, beside the good determination coefficient and low residual effect. The secondary component, the number of achenes, despite the significant direct effect on productivity, was indirectly influenced by the primary components, making it an undesirable character for selection.

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Pós-graduação em Agronomia (Agricultura) - FCA

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Nitrogen, along with K, is the most limiting nutrient for sunflower productivity. The objective of this research work was to determine the best level of nitrogen in a fertilization formula for the cultivation of sunflower of the ‘HELIO – 251’ cultivar. The fertilization procedure was that recommended for the state of São Paulo for sunflower crop, except that, in each one of the treatments, N doses were of 50, 70, 90, 110, and 130 kg ha-1 . These treatments were distributed in the field according to a randomized complete block design with 4 replications. The N dose which resulted in the highest grain yield, highest oil content, and plant dry matter was of 100 kg ha-1 . Leaf N content and 1,000 grains weight increased with N doses.