Produção e crescimento do capim piatã com adubação orgânica e mineral e emissões de CH4 e N2O

Abstract

Nitrogen fertilization can affect production, growth and cause environmental impacts such as greenhouse gas emissions. The objective of this study was to evaluate the effect of different sources of fertilizer (urea compost and biofertilizer) on forage production, morphogenic and structural characteristics forage emission nitrous oxide (N2O) and methane (CH4). Four treatments were evaluated (urea, compost, biofertilizer and control) in a randomized block design with 6 replications. The forage characteristics evaluated were: forage yield, leaf appearance rate (TApF), phyllochron (FILO), leaf elongation rate (TAlF) and stem (TAlC), leaf life (DVF), final leaf length. leaf (CFF) and number of tillers (Nperf). GHG emission was evaluated using static chamber methodology and gas concentration determination by gas chromatography. Forage yield was affected by fertilizer type and season being higher in urea treatment. The variables TApF, FILO, TAlF and TAlC were influenced by fertilizer type and season increasing with fertilization. N2O emissions differed between treatment being 1.16, 0.46 and 0.20% for biofertilizer, urea and compost respectively and application of compost stimulated CH4 oxidation. Biofertilizer and compost can be used as an alternative to synthetic fertilizer and compost has greater potential for mitigating nitrogen pollution.