Resumo

KATHERINE, ARCE-RODRÍGUEZ, et al. Emissions nitrous oxide and methane in active pastures in the tropical humid forest living zone in Costa Rica. Rev.Bio.Agro [online]. 2023, vol.21, n.2, pp.130-145.  Epub 01-Dez-2023. ISSN 1692-3561.  https://doi.org/10.18684/rbsaa.v21.n2.2023.2143.

The active management of pastures affects animal productivity and soil biogeochemical processes of the soil, nutrient cycling, where pastures management is a relevant factor to maintain these biogeochemical processes, productivity, and the flow of Greenhouse Gas emissions. Greenhouse (GHG). The main objective of this study was to evaluate the GHG emissions from three types of fertilizers (conventional, urea and biofertilizer) used for the maintenance of pastures in dairy production in the humid tropics of Costa Rica, in order to identify measures of mitigation that contribute to the reduction of GHG emissions in the agricultural sector and that contribute to the NDC of the country. The experimental design corresponds to a completely randomized block design, where with three repetitions per treatment (Control, Biofertilizer, Urea and Conventional Fertilizer), the total of samples corresponds to 497 samples, during a period of 81 days. Measurement of the amounts of methane (CH4) and nitrous oxide (N2O). The analysis of the Carbon and Nitrogen content was performed at a depth of -10 cm to take the soil sample and analyze it by means of an instrumental method of dry oxidation. The mean values of these measurements were as follows: 0,104 mgN2O-N/ m2/day and 0,037 mgCH4-C/m2/day. GHG emissions during monitoring were influenced by processes of methanogenesis, denitrification, nitrification and respiration. The biofertilizer (biol) presented the lowest GHG emissions given considering the concentrations of Carbon and Nitrogen in the soil.

Palavras-chave : Fertilizers; GHG flows; Animal husbandry; Mitigation; Methane; Nitrous oxide; Static cameras; Pastures; Tropic.

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