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- Title
Nitrogen dynamics in a Latosol cultivated with coffee.
- Authors
Souza, José A.; Rocha, Genelício C.; de P. Gomes, Mateus; Rezende, Carlos H. S.
- Abstract
The objective of this study was to evaluate nitrogen losses by NH3 volatilization and quantify the upward and downward NO3 - flows in Latosol cultivated with arabica coffee. An experiment was set in 2010, in Vicosa-MG, Brazil (20o 41' S and 42o 48' W), in a randomized block design in a (3 x 2) + 1 factorial arrangement with three nitrogen doses (200, 400 and 600 kg ha-1), two forms of urea (conventional and NBPT urease inhibitor-treated) and one additional treatment without nitrogen fertilization, with four replicates. Semi-open type chambers were installed to quantify NH3 volatilization. To determine the concentration and flow of NO3 - a soil solution extractor was installed in each plot at a 1-m depth together with three tensiometers at depths of 0.90, 1.00 and 1.10 m. Nitrogen losses by volatilization were 3.51 and 11.21% for NBPT-treated urea and conventional urea, respectively. The rainfall (1172 mm), its distribution and the dose strongly influenced the losses by leaching. Urease inhibitor-treated urea led to higher risk of groundwater contamination with NO3 -. Returns of NO3 - occur in periods of drought, but it is not possible to state if this NO3 - can be used by the plant because, under these conditions, the soil has low moisture content, which may compromise the absorption.
- Subjects
COFFEE growing; FERRALSOLS; EFFECT of nitrogen on plants; LEACHING; UREA
- Publication
Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi, 2018, Vol 22, Issue 6, p390
- ISSN
1807-1929
- Publication type
Article
- DOI
10.1590/1807-1929/agriambi.v22n6p390-395