CO2, CH4 and N2O fluxes in an Ultisol treated with sewage sludge and cultivated with castor bean

Revista Brasileira de Ciência do Solo

Jonas Jacob Chiaradia²  Marcio Koiti Chiba¹  Cristiano Alberto De Andrade¹  Janaína Braga Do Carmo¹  Claudeir De Oliveira¹  Arquimedes Lavorenti¹ 

[1] ,Agricultura & AmbientePiracicaba SP

关键词: residue;    nitrogen;    carbon dioxide;    nitrous oxide;    methane;    resíduo;    nitrogênio;    dióxido de carbono;    óxido nitroso;    metano;   

DOI  :  10.1590/S0100-06832009000600035

来源: SciELO

【 摘 要 】

Organic residue application into soil alter the emission of gases to atmosphere and CO2, CH4, N2O may contribute to increase the greenhouse effect. This experiment was carried out in a restoration area on a dystrophic Ultisol (PVAd) to quantify greenhouse gas (GHG) emissions from soil under castor bean cultivation, treated with sewage sludge (SS) or mineral fertilizer. The following treatments were tested: control without N; FertMin = mineral fertilizer; SS5 = 5 t ha-1 SS (37.5 kg ha-1 N); SS10 = 10 t ha-1 SS (75 kg ha-1 N); and SS20 = 20 t ha-1 SS (150 kg ha-1 N). The amount of sludge was based on the recommended rate of N for castor bean (75 kg ha-1), the N level of SS and the mineralization fraction of N from SS. Soil gas emission was measured for 21 days. Sewage sludge and mineral fertilizers altered the CO2, CH4 and N2O fluxes. Soil moisture had no effect on GHG emissions and the gas fluxes was statistically equivalent after the application of FertMin and of 5 t ha-1 SS. The application of the entire crop N requirement in the form of SS practically doubled the Global Warming Potential (GWP) and the C equivalent emissions in comparison with FertMin treatments.

【 授权许可】

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