Ammonia volatilisation from coated urea in conilon coffee crop

• Autor(a) principal: Rodrigues, José de Oliveira
• Data de Publicação: 2017
• Outros Autores: Partelli, Fábio Luiz, Pires, Fábio Ribeiro, Oliosi, Gleison, Espindula, Marcelo Curitiba, Monte, José Antônio
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Coffee Science (Online)
• Texto Completo: https://coffeescience.ufla.br/index.php/Coffeescience/article/view/1167
• topic: N-NH3 losses; nitrogen; Coffea canephora; Perdas de N-NH3; nitrogênio; Coffea canephora

Among the sources of nitrogen (N) used in agriculture urea is the most widely used fertilizer in Brazil. However, this source presents problems with the application on the soil surface due to N losses by NH3 volatilisation, resulting from the action of the enzyme urease. This study aimed to determine the losses of nitrogen (N) by Ammonia volatilisation and yield of Conilon coffee plants fertilized with protected ureas. The experiment was installed in Nova Venécia – Espírito Santo state, Brazil, in commercial coffee farming Conilon ‘Vitória INCAPER 8142’ with five sources of nitrogen fertilizers: Common Urea-45% N (UC45), Urea-45% N + NBPT (U45+NBPT), Urea-44.6% N + 0.15% Cu + 0.4 % B (U44.6+Cu+B); Urea-37% N + 17% de S (U37+S), and Ammonium Nitrate-34% N (AN34). The experimental design was randomized blocks with five treatments and six replicates. Ammonia collectors were installed in each plot immediately after fertilizer application. Ureas protected by NBPT inhibitor and the Cu + B micronutrients have lower volatilisation losses in relation to unprotected urea. The coating of urea with sulfur does not provide reduced losses of N by volatilisation. The coffee yield is not affected by the use of protected ureas with NBPT, Cu + B and S under the conditions studied.