Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/11222
Title: Eficiência agronômica da ureia estabilizada com inibidores de urease e nitrificação na cultura do milho
Other Titles: Agronomic efficiency of stabilized urea application in corn production
Authors: Silva, Douglas Ramos Guelfi
Faquin, Valdemar
Figueiredo, Cícero Célio de
Silva, Douglas Ramos Guelfi
Carneiro, Marco Aurelio Carbone
Keywords: Fertilizantes nitrogenados
Fertilizantes – Tecnologia
Uréia como fertilizante
Amônia - Volatilização
Nitrogen fertilizers
Fertilizers – Technology
Urea as fertilizer
Ammonia - Volatilization
Issue Date: 3-Jun-2016
Publisher: Universidade Federal de Lavras
Citation: SILVA, A. L. Eficiência agronômica da ureia estabilizada com inibidores de urease e nitrificação na cultura do milho. 2016. 71 p. Dissertação (Mestrado em Ciência do Solo) - Universidade Federal de Lavras, Lavras, 2016.
Abstract: 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.
URI: http://repositorio.ufla.br/jspui/handle/1/11222
Appears in Collections:Ciência do Solo - Mestrado (Dissertações)



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