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Pesquisa Agropecuária Brasileira

versão impressa ISSN 0100-204Xversão On-line ISSN 1678-3921

Resumo

ARAUJO, Ednaldo da Silva et al. Calibration of a semi-opened static chamber for the quantification of volatilized ammonia from soil. Pesq. agropec. bras. [online]. 2009, vol.44, n.7, pp.769-776. ISSN 0100-204X.  http://dx.doi.org/10.1590/S0100-204X2009000700018.

The objective of this work was to calibrate a practical and low-cost chamber for the quantification of ammonia volatilization from soil. The chamber was calibrated using the 15N isotope balance technique. The volatilized ammonia was captured by a semi-opened free static chamber built with a 2 L ethylene polyterephthalate (PET) plastic bottle. The inner side of the chamber had free-air circulation and a stripe of polyurethane foam, with 2.5 cm wide and 25 cm long, hanged vertically with the lower end inserted in a bottle containing acid solution, which kept the foam moistened. The recovery of 15N-ammonia by the chamber increased linearly with the increase in the rate of soil ammonia volatilization. Field tests showed an efficiency of 57% in the volatilized ammonia recuperation. The sampling interval of foam can vary from one to six days without impairing the system efficiency. For studies in the field using the proposed method, a correction factor of 1.74 should be used to estimate the real rate of ammonia volatilization from soil.

Palavras-chave : Ammonia emission factor; 15N isotope; NH3 collecting system; urea; ammonia volatilization.

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