Data/hora: 09/06/2024 04:07:46

Provedor de dados: | 64
País: | Brazil
Título: | Ammonia volatilization from blends with stabilized and controlled-released urea in the coffee system
Autores: | Chagas,Wantuir Filipe Teixeira; Guelfi,Douglas Ramos; Caputo,André Luiz Carvalho; Souza,Taylor Lima de; Andrade,André Baldansi; Faquin,Valdemar.
Data: | 2016-10-01
Ano: | 2016
Palavras-chave: | Irrigation; Nitrogen fertilizer technologies; Polymer-sulfur coated urea.
Resumo: | ABSTRACT Application of stabilized and controlled-release urea blends can reduce the losses of N-NH3 as compared to conventional urea. The aim of this study was to quantify ammonia volatilization from conventional nitrogen fertilizers and blends of urea + (urea + NBPT) + controlled release urea applied in drip irrigated coffee system. The experiment was conducted under field conditions in in a Red Latosol located in Lavras-MG, Brazil. The randomized complete block design with six treatments: Urea = 450 kg ha-1 yr-1 N (100% of the recommended dose) divided in three splittings equal to 150 kg ha-1 N with an interval of 50 days; ammonium nitrate = 450 kg ha-1 yr-1 N (100% of the recommended dose) in three splittings equal to 150 kg ha-1 N with an interval of 50 days; Polyblen Extend(r)-100%= 450 kg ha-1 yr-1 (100% of the recommended dose) applied in two splittings, 315 kg ha-1 N in the 1º split and 135 kg ha-1 N in the 2º split; Polyblen Extend(r)-70% = 315 kg ha-1 yr-1 N (70% of the recommended dose) in two splittings, 220.5 kg ha-1 N in the 1º split and 94.5 kg ha-1 N in the 2º split; Polyblen Montanha(r)-100% = 450 kg ha-1 yr-1 (100% of the recommended dose) in an unique application in the 1º split and Polyblen Montanha(r)-70% = 315 kg ha-1 yr-1 N (70% of the recommended dose) at an unique application in the 1º split, with three repetitions. Total accumulated N-NH3 losses followed the decreasing order: Urea (83.2 kg ha-1 N) &gt; Polyblen Extend(r) - 100% (60.3 kg ha-1 N) &gt; Polyblen Montanha(r) - 100% (46.8 kg ha-1 N) &gt; Polyblen Extend(r) - 70% (35.1 kg ha-1 N) &gt; Polyblen Montanha(r) - 70% (24.2 kg ha-1 N) &gt; nitrate ammonium (2.0 kg ha-1 N ). The use of Polyblen Montanha(r) decreases two splittings compared to conventional sources such as urea and ammonium nitrate, by applying only 70% of the recommended dose without affecting yield and coffee crop nutrition.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000500497
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/1413-70542016405008916
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.40 n.5 2016
Fonte: | info:eu-repo/semantics/openAccess