Irrigação e adubação nitrogenada do Pinhão Manso (Jatropha curcas L.) na região Leste de Minas Gerais

• Ano de defesa: 2011
• Autor(a) principal: Leite, Caio Vinicius
• Orientador(a): Soares, Antonio Alves
• Banca de defesa: Monaco, Paola Alfonsa Vieira Lo , Cunha, Fernando França da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Engenharia Agrícola
• Departamento: Construções rurais e ambiência; Energia na agricultura; Mecanização agrícola; Processamento de produ
• País: BR
• Palavras-chave em Português: Irrigação; Pinhão manso; Line source; Adubação nitrogenada
• Palavras-chave em Inglês: Irrigation; Jatropha; Line source; Nitrogen fertilization
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA
• Link de acesso: http://locus.ufv.br/handle/123456789/3585

The jatropha (Jatropha curcas L.) is one of the main crops for biofuel production and the eastern region of Minas Gerais can be a potential producer because of its rainfall, temperature and soil conditions. This work aimed to evaluate the response of jatropha subjected to different irrigation water depths, nitrogen fertilization dosis and two spacings in this region. The study was conducted on the campus II of the Universidade Vale do Rio Doce (UNIVALE) located in the city of Governador Valadares, Minas Gerais State. The experiment was conducted in a split split plot scheme, with two spaces in the plots, five irrigation depths in subplots and four nitrogen dosis in subsubplots. A line source sprinkler irrigation system was used to differentiate the applied water deths. A significant effect of spacing, irrigation depths and days after transplanting was found for both height and diameter, however, only height showed significant effects for the dosis of nitrogen. Regarding productivity, the average yield was 397.0 kg ha-1 in the first harvest (acumulated until 10/12/2009) and 795.2 kg ha-1 in the second one (accumulated until 05/06/2010), and total mean was 596.1 kg ha-1. An interaction was observed between the spacing factors versus depth of irrigation, however no significant effect of nitrogen factor in the first harvest. For the second harvest, the effect of irrigation on yield was not significant. The highest yield of jatropha (458.8 kg ha-1) was achieved with application of 971 mm in the first harvest, and 679 mm in the second crop (819.6 kg ha-1). For nitrogen dosis, the highest yield (449.7 kg ha-1) was achieved with application of 50 kg N ha-1 in the first harvest, and 150 kg N ha-1 in the second one (923.7 kg ha-1). The space that provided the highest yield was 2x1 m, with values of 412.5 kg ha-1 in the first harvest and 818.2 kg ha-1 on the second one. The crop coefficient (Kc) of jatropha average of 0.41 was found for stage I (0 to 20 days after transplanting), 0.66 for stage II (21 to 90 days) and 0.95 for stage III onwards (91 days before). With this values, it was simulated the soil water balance and found that the water use efficiency (WUE), for the first harvest, had a significant quadratic effect of the water depth, while for the second crop both the water depth as the nitrogen dosis provided significant quadratic effect in the WUE. It was not observed in any significant effect of crop spacing in the WUE. For the first harvest, the largest WUE (61.8 g m-3) was found to application of 776 mm and 150 kg N ha-1, and for the second one, the largest U.S. (242.1 g m-3) was for the application of 679 mm and 150 kg ha-1 N.