989 resultados para 1995_03270045 TM-45 4501704


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Pós-graduação em Pediatria - FMB

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ECLAC Proposes for Latin America and the Caribbean a Social Protection Covenant Shaping the Future of Social Protection. Op-ed by ECLAC's Executive Secretary, José Luis Machinea Reform Agenda in Health Pension System Reforms Should Expand Coverage Resolutions approved during ECLAC's Thirty-first Session Social Programmes Help to Offset the Region's Poverty but Still Face Major Challenges Human Rights and Development to the Centre of Debate on Migration Challenges and Opportunities for Migration Governance Prospects for Growth Statistical Appendix Recent Titles Calendar

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CEPAL propone pacto de protección social para América Latina y el Caribe La protección social de cara al futuro. Columna de opinión de José Luis Machinea, Secretario Ejecutivo de la CEPAL Agenda de reformas en salud Doble desafío: reformar los sistemas de pensiones para expandir la cobertura Resoluciones del Trigésimo primer período de sesiones de la CEPAL Los programas sociales contribuyen a paliar la pobreza pero enfrentan grandes desafíos Derechos humanos y desarrollo, al centro del debate sobre migración Desafíos y oportunidades para la gobernabilidad migratoria Proyecciones de crecimiento Apéndice estadístico Publicaciones recientes Calendario

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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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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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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Nitrogen (N) is the most required nutrient for corn plants and, in order to supply this demand in highly productive crops, mineral fertilizers are used, especially urea. The disadvantage of urea is the loss of N-NH3 to atmosphere. To reverse this situation, some technologies have been developed, such as nitrification and urease inhibitors, which are used as additives to urea. This work aimed at evaluating the agronomic efficiency of urea stabilized with urease and nitrification inhibitors applied to cover the 2013/2014 corn crop. We evaluated 11 nitrogen fertilizer applied in coverage: urea + PA (41.6% N, 3% Cu); urea + PA (41.6% N, 1.5% Cu); urea + PA (41.6% N, 3% Zn); urea + PA (41.6% N, 1.5% Zn); urea + PA (41.6% N, 0.34% Cu, 0.94% B); urea + PA (41.6% N, 0.25% Cu, 0.68% B); urea + PA (41.6% N); urea (44.3% N, 0.15% Cu, 0.4% B); urea (43% N, 0.1% Cu, 0.3% B, 0.05% Mo); pearled urea (46% N); urea + 0,8% DMPP (45% N) and the control, which did not receive nitrogen topdressing. The evaluations were: Nitrogen losses through volatilization, content and accumulation of N, boron (B), copper (Cu) and zinc (Zn) to the dry matter of aerial parts, grains, and in straw and grain productivity. Fertilizers stabilized with urease and nitrification inhibitors did not reduce the volatilization of ammonia volatilization, when compared to pearled urea. Urea with 0.8% of DMPP nitrification inhibitor (3,4-dimethylpyrazole phosphate) provided higher loss by volatilization, lower productivity and agronomic efficiency compared to pearled urea. The coating of urea with Cu, B and Zn did not increase the accumulation of these nutrients in grains and MSPA plants. The use of fertilizers stabilized and coated with micronutrients did not increase the productivity and agronomic efficiency compared to conventional urea.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)