Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T12:58:30Z No. of bitstreams: 2 christiano_conceicao_matos.pdf: 1168384 bytes, checksum: e9f190696619331c30543818c50f9de2 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T13:13:55Z (GMT) No. of bitstreams: 2 christiano_conceicao_matos.pdf: 1168384 bytes, checksum: e9f190696619331c30543818c50f9de2 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T13:13:53Z (GMT) No. of bitstreams: 2 christiano_conceicao_matos.pdf: 1168384 bytes, checksum: e9f190696619331c30543818c50f9de2 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T13:14:43Z (GMT) No. of bitstreams: 2 christiano_conceicao_matos.pdf: 1168384 bytes, checksum: e9f190696619331c30543818c50f9de2 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Made available in DSpace on 2014-12-22T13:14:43Z (GMT). No. of bitstreams: 2 christiano_conceicao_matos.pdf: 1168384 bytes, checksum: e9f190696619331c30543818c50f9de2 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2013 / Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordenadoria de Aperfei?oamento do Pessoal de N?vel Superior (CAPES) / A Nicandra physaloides (L) Gaertn. ? uma planta daninha que infesta ?reas agr?colas brasileiras. O conhecimento do comportamento das plantas, frente aos recursos do meio, como a luz, ?gua e principalmente a disponibilidade de nutrientes no solo, torna-se fundamental para adotar t?ticas de manejo das mesmas nos agroecossistemas. Observa??es de campo sugerem a esp?cie como planta daninha de ciclo r?pido, que adapta-se bem a solos de alta fertilidade e com grande capacidade em acumular mat?ria seca, cujo material vegetal ? rapidamente decomposto no solo. O objetivo deste estudo foi avaliar o efeito do aumento de doses de nitrog?nio, f?sforo e pot?ssio no crescimento de Nicandra physaloides, bem como, os teores de nutrientes, as caracter?sticas bromatol?gicas e a rela??o C/N presentes na mat?ria seca dessa planta daninha. No primeiro experimento foi avaliada a influ?ncia das doses de nutrientes no ac?mulo e parti??o de mat?ria seca, na altura e nas taxas de crescimento de N. physaloides. No segundo experimento foram avaliados os efeitos das doses de N, P e K nos teores e ac?mulo de nutrientes, nas caracter?sticas bromatol?gicas e na rela??o C/N, presentes na mat?ria seca das plantas. Observou-se que a esp?cie ? altamente responsiva ? aduba??o. No entanto, o padr?o de distribui??o de biomassa n?o foi alterado pela aduba??o. Ao ser cultivada em solo de baixa fertilidade, N. physaloides apresentou baixas taxas de crescimento. Maiores teores de N, P e K foram encontrados em plantas submetidas aos maiores n?veis de nutrientes. O aumento nos n?veis de N, P e K no solo proporcionou maior ac?mulo total desses macronutrientes. Os tratamentos n?o influenciaram a composi??o bromatol?gica (FDN e FDA) e a rela??o C/N da planta. N. physaloides apresentou baixa rela??o C/N durante todo o per?odo de avalia??o, o que aliado aos baixos teores de FDN e FDA e ao bom ac?mulo de nutrientes, sugere que o material vegetal proveniente dessa planta seja rapidamente decomposto, proporcionando uma ciclagem r?pida de nutrientes no solo. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2013. / ABSTRACT Nicandra physaloides (L) Gaertn. is a weed that infests Brazilian agricultural areas. Knowledge the behavior of plants against environmental resources, such as light, water and mainly the availability of nutrients in the soil, being essential to management in agroecosystems. Field reports suggest the weed species of fast cycle has the characteristics following: well adapted to soils of high fertility and high capacity to accumulate dry matter; which plant matter is quickly decomposed in soil. The objective of this study was to evaluate the effect of increasing of N, P and K doses on growth of Nicandra physaloides as well as the nutrients content, chemical characteristics and C/N ratio of the weed. In the first experiment was evaluated the influence of nutrient levels in accumulation and partitioning of dry matter, height and growth rates of N. physaloides. In the second experiment evaluated the effects of N, P and K doses on content and accumulation of nutrients, chemical characteristics and the C/N ratio of the weed. The specie was highly responsive to fertilization. However, biomass partitioning was not altered by fertilization. When grown on low soils fertility levels, N. physaloides showed low growth rates on low nutrients level. Higher N, P and K contents were observed in plants grown on higher levels of fertilizer. The increasing of N, P and K levels of soil resulted in greater total accumulation of these macronutrients. The treatments did not affect the chemical composition (NDF and ADF) and the C/N ratio of plant. N. physaloides showed lower C/N ratio during experimental period, which combined to low levels of NDF and ADF and great nutrient accumulation, suggests that this plant matter is quickly decomposed, providing a rapid cycling of nutrients.