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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Cultivo do girassol irrigado sob diferentes lâminas de água e doses de nitrogênio / Sunflower cultivation irrigated under different water blades and nitrogen doses

Freire, Jonas de Oliveira 29 August 2016 (has links)
Submitted by Lara Oliveira (lara@ufersa.edu.br) on 2017-02-14T19:11:01Z No. of bitstreams: 1 JonasOF_TESE.pdf: 3319263 bytes, checksum: 51b79bea8bd5a5a042d4db215bfe1a86 (MD5) / Approved for entry into archive by Socorro Pontes (socorrop@ufersa.edu.br) on 2017-02-15T14:50:14Z (GMT) No. of bitstreams: 1 JonasOF_TESE.pdf: 3319263 bytes, checksum: 51b79bea8bd5a5a042d4db215bfe1a86 (MD5) / Approved for entry into archive by Vanessa Christiane (referencia@ufersa.edu.br) on 2017-02-15T14:52:02Z (GMT) No. of bitstreams: 1 JonasOF_TESE.pdf: 3319263 bytes, checksum: 51b79bea8bd5a5a042d4db215bfe1a86 (MD5) / Made available in DSpace on 2017-03-21T14:53:47Z (GMT). No. of bitstreams: 1 JonasOF_TESE.pdf: 3319263 bytes, checksum: 51b79bea8bd5a5a042d4db215bfe1a86 (MD5) Previous issue date: 2016-08-29 / Sunflower adapts to different conditions of climate and soil, including the prevailing climate in the Northeast, but the water needs, as well as nitrogen fertilizer recommendations are not yet fully defined. The objective of this study was to evaluate sunflower productivity and efficiency of water and nitrogen use. The experiment was conducted between October 2013 to January 2014 in Unidade Agrícola Industrial Escola do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte (IFRN/Campus Apodi), Apodi, in the state of Rio Grande do Norte, Brazil. Statistical design used was in blocks in the 4 x 4 factorial scheme with four replications. The treatments consisted of four water slides 58, 80, 100 and 120% of crop evapotranspiration (ETc) associated with four doses of nitrogen 40, 100, 200 and 370% of the dose recommended for the cultivation of 70 kg ha-1. The depth water of 517 mm (108% ETc) associated with nitrogen dose of 77 kg ha-1 provided 91.3% of the maximum productivity, these being the doses recommended in the studied conditions. The oil productivity depending on depths water and nitrogen levels followed the trend surface function in oil yield of water depths and doses of nitrogen. The water factor was most limiting characteristics evaluated the nitrogen fertilization / O girassol se adapta a diferentes condições de clima e solo, inclusive ao clima predominante na Região Nordeste, porém, as necessidades hídricas, assim como as recomendações de adubação nitrogenada, ainda não estão perfeitamente definidas. Objetivouse com o presente estudo, avaliar a produtividade do girassol e a eficiência do uso da água e nitrogênio. O experimento foi conduzido no período de 29 outubro de 2013 a janeiro de 2014 na Unidade Agrícola Industrial Escola do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte (IFRN/Campus Apodi), Apodi, RN. O delineamento estatístico adotado foi em blocos no esquema fatorial 4 x 4 com quatro repetições. Os tratamentos consistiram em quatro lâminas de irrigação 58, 80, 100 e 120% da evapotranspiração da cultura (ETc) associadas a quatro doses de nitrogênio 40, 100, 200 e 370% da dose padrão de 70 kg ha- 1. A lâmina de água de 517 mm (108% da ETc) associada a dose nitrogenada de 77 kg ha-1 proporcionou 91,3% da produtividade máxima de grãos, sendo estas as doses recomendadas nas condições estudadas. A produtividade de óleo em função das doses de água e nitrogênio acompanhou a tendência da superfície do rendimento de óleo em função das lâminas de água e doses de nitrogênio. As lâminas de água foram mais limitantes às características avaliadas que a adubação nitrogenada / 2017-02-14

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