Emission of nitrous oxide in intensification systems of production on pasture with nitrogen fertilization

• Grant number: 18/24652-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: February 01, 2019
• End date: January 31, 2021
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Pastures and Forage Crops
• Principal Investigator: Ricardo Andrade Reis
• Grantee: Lais Mayumi Gomes
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
• Associated research grant: 15/16631-5 - Management strategies to reduce environmental impacts of beef cattle production systems, AP.PFPMCG.TEM

Abstract

Nitrous oxide is a greenhouse gas that comes from agricultural activity, which does not yet have national emission data, quantifying (separately from feces and urine) interacting with nitrogen fertilization, which may differ from the emission factors of the IPCC of excreta (EF3) and fertilizers (EF1). The process of N2O production is due to the microbial action, referring to nitrification and denitrification, being dependent on soil conditions. Therefore, the importance of nitrous oxide research in tropical soils in Brazil. As the country has a large percentage of its economy linked to the agricultural sector, it is necessary to understand and study the dynamics between pasture, animal and soil to design systems that are less polluting of the environment, without losing the productivity of the area. The experiment was carried out in a randomized complete block design with five blocks and eight treatments (75 kg of nitrogen (N) ha-1 year-1, faeces and zero of urine and zero of N, faeces + 75 kg of N, faeces + 150 kg of N, urine + 75 kg N, urine + 150 kg of N, zero of urine, faeces and N), each experimental unit will be an evaluation chamber. In order to estimate the emission of N2O, samples of gas will be collected in the static chambers between 9 and 10 am which will be analyzed by gas chromatography. With this we will calculate the emission factors adapted to the Brazilian conditions, aiming the knowledge of the interaction between these factors. In addition, we will have the refinement of evaluations of N2O emission factors (EF1, EF3PRP), for urine, feces and interaction with fertilizer.