AMMONIA LOSSES ESTIMATED BY AN OPEN COLLECTOR FROM UREA APPLIED TO SUGARCANE STRAW

Autor(es)

Mariano, Eduardo ^[1] ; Ocheuze Trivelin, Paulo Cesar ^[2] ; Vieira, Michele Xavier ^[1] ; Leite, Jose Marcos ^[1] ; Otto, Rafael ^[1] ; Junqueira Franco, Henrique Coutinho ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Ctr Nucl Energy Agr, BR-13416000 Piracicaba, SP - Brazil

^[3] Brazilian Res Ctr Energy & Mat UNPEM, Brazilian Bioethanol Sci & Technol Lab, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Revista Brasileira de Ciência do Solo; v. 36, n. 2, p. 411-419, MAR-APR 2012.
• Citações Web of Science: 15

Resumo

The quantification of ammonia (NH3) losses from sugarcane straw fertilized with urea can be performed with collectors that recover the NH3 in acid-treated absorbers. Thus, the use of an open NH3 collector with a polytetrafluoroethylene (PTFE)-wrapped absorber is an interesting option since its cost is low, handling easy and microclimatic conditions irrelevant. The aim of this study was to evaluate the efficiency of an open collector for quantifying NH3-N volatilized from urea applied over the sugarcane straw. The experiment was carried out in a sugarcane field located near Piracicaba, Sao Paulo, Brazil. The NH3-N losses were estimated using a semi-open static collector calibrated with N-15 (reference method) and an open collector with an absorber wrapped in PTFE film. Urea was applied to the soil surface in treatments corresponding to rates of 50, 100, 150 and 200 kg ha(-1) N. Applying urea-N fertilizer on sugarcane straw resulted in losses NH3-N up to 24 % of the applied rate. The amount of volatile NH3-N measured in the open and the semi-open static collector did not differ. The effectiveness of the collection system varied non-linearly, with an average value of 58.4 % for the range of 100 to 200 kg ha(-1) of urea-N. The open collector showed significant potential for use; however, further research is needed to verify the suitability of the proposed method. (AU)

• Processo FAPESP: 09/04691-2 - Mineralização e disponibilidade de nitrogênio em solos cultivados com cana-de-açúcar
• Beneficiário: Eduardo Mariano
• Modalidade de apoio: Bolsas no Brasil - Mestrado