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Cimélio Bayer ;Revista Brasileira de Ciência do Solo 2010, 34 5

Autor: Sandra Mara Vieira Fontoura

Fuente: http://www.redalyc.org/


Introducción



Revista Brasileira de Ciência do Solo ISSN: 0100-0683 revista@sbcs.org.br Sociedade Brasileira de Ciência do Solo Brasil Vieira Fontoura, Sandra Mara; Bayer, Cimélio AMMONIA VOLATILIZATION IN NO-TILL SYSTEM IN THE SOUTH-CENTRAL REGION OF THE STATE OF PARANÁ, BRAZIL Revista Brasileira de Ciência do Solo, vol.
34, núm.
5, 2010, pp.
1677-1684 Sociedade Brasileira de Ciência do Solo Viçosa, Brasil Available in: http:--www.redalyc.org-articulo.oa?id=180215650020 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative AMMONIA VOLATILIZATION IN NO-TILL SYSTEM IN THE SOUTH-CENTRAL REGION. 1677 AMMONIA VOLATILIZATION IN NO-TILL SYSTEM IN THE SOUTH-CENTRAL REGION OF THE STATE OF PARANÁ, BRAZIL (1) Sandra Mara Vieira Fontoura(2) & Cimélio Bayer(3) SUMMARY Ammonia (NH3) volatilization can reduce the efficiency of urea applied to the surface of no-till (NT) soils.
Thus, the objectives of this study were to evaluate the magnitude of NH3 losses from surface-applied urea and to determine if this loss justifies the urea incorporation in soil or its substitution for other N sources under the subtropical climatic conditions of South-Central region of Paraná State, Brazil. The experiment, performed over four harvesting seasons in a clayey Hapludox followed a randomized block design with four replicates.
A single dose of N (150 kg ha-1) to V5 growth stage of corn cultivated under NT system was applied and seven treatments were evaluated, including surface-applied urea, ammonium sulfate, ammonium nitrate, urea with urease inhibitor, controlled-release N source, a liquid N source, incorporated urea, and a control treatment with no N application. Ammonia volatilization was evaluated for 20 days after N application using a semiopen static system...





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