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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Mathematical models for adjustments in the quantification of ammonia volatilization from urea fertilizer applied on tropical pastures

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Author(s):
Vanessa Zirondi Longhini [1] ; Luís Carlos Vinhas Ítavo [2] ; Antonio Leandro Chaves Gurgel [3] ; Abmael da Silva Cardoso [4] ; Robert Michael Boddey [5] ; Gelson dos Santos Difante [6] ; Alexandre Menezes Dias [7] ; Camila Celeste Brandão Ferreira Ítavo [8] ; Gabriel de Souza Lombardi da Silva [9] ; Ana Claudia Ruggieri [10]
Total Authors: 10
Affiliation:
[1] Universidade Federal do Mato Grosso do Sul (UFMS) - Brasil
[2] Universidade Federal do Mato Grosso do Sul (UFMS) - Brasil
[3] Universidade Federal do Piauí (UFPI) - Brasil
[4] University of Florida. Range Cattle Research and Education Center - Estados Unidos
[5] Embrapa Agrobiologia - Brasil
[6] Universidade Federal do Mato Grosso do Sul (UFMS) - Brasil
[7] Universidade Federal do Mato Grosso do Sul (UFMS) - Brasil
[8] Universidade Federal do Mato Grosso do Sul (UFMS) - Brasil
[9] Universidade Federal do Mato Grosso do Sul (UFMS) - Brasil
[10] Universidade Estadual de São Paulo (Unesp). Departamento de Zootecnia - Brasil
Total Affiliations: 10
Document type: Journal article
Source: Ciência Rural; v. 54, n. 5 2023-12-08.
Abstract

ABSTRACT: In Brazil, urea is the most used nitrogen (N) fertilizer to improve forage production. However, their excessive use can cause environmental impacts through N losses, such as ammonia (NH3) volatilization. Therefore, the current study adjusted and estimated the NH3 volatilization from urea applied on tropical pastures in three rainfall conditions using mathematical models. Data were collected from Marandu grass (Brachiaria brizantha) fertilized with 50 kg N ha-1 during wet, intermediate, and dry conditions. Ammonia volatilization was measured in five semi-open chambers for 21 days. The linear, quadratic, exponential, Gompertz, Groot, and Richards models were tested for fitting and estimating the NH3 volatilization. The Gompertz, Groot, and Richards models generated predictions similar to the observed data, with a high determination coefficient, indicating a better fit of these equations to data, with precision and accuracy. However, the Groot model was selected due to the lowest root mean square error of prediction (0.29 % total N lost as NH3). The greatest N loss as NH3 volatilization occurred in the wet, followed by intermediate and dry conditions (20.2, 17.0, and 11.3 % total N lost as NH3, respectively). Therefore, nitrogen losses as NH3 volatilization after application of 50 kg N ha-1, as urea source, are altered according to the weather conditions, reaching 20% of N added in the wet rainfall period. The Groot model is recommended for fitting and estimating the NH3 volatilization from urea applied on Marandu grass pastures in the wet and dry rainfall conditions. (AU)

FAPESP's process: 16/11086-1 - Mitigation of greenhouse gases in pastures Marandu Grass managed with legumes or nitrogen fertilizer
Grantee:Vanessa Zirondi Longhini
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 17/11274-5 - Decomposition of litter and greenhouse gases emission in Brachiaria grasses with increasing nitrogen fertilizer rates
Grantee:Abmael da Silva Cardoso
Support Opportunities: Scholarships in Brazil - Post-Doctoral