Nitrogen dynamics in a production system using Brachiaria as a cover plant

Abstract

There is evidence that Brachiaria ruziziensis affects nitrogen dynamics in the soil by modifying microbiota composition, affecting maize response to the fertilizer. This project will deepen studies on the N fate in the soil in the presence of B. ruziziensis and other grasses, considering deep leaching and gaseous losses.Objectives: To understand N dynamics and determine N fate in cropping systems using grasses as cover crops, as well as its effects on maize response to N. Work plan: A field experiment will be conducted using different grasses in rotation with soybean and maize. Maize response to N will be assessed. Nitrogen dynamics in the system will be studied using 15N labeled fertilizer; N leaching will be determined by analyzing soil solution 80 cm deep in the soil profile and water deep drainage, N emissions as ammonium and nitrous oxide will be monitored.Justification: This project is important to understand N fate in the soil in a crop rotation very important in tropical areas. Nitrogen Use efficiency. The collaboration of a Pos-Doc will be an important part of the general project NUCLEUS, and particularly of WP3. The use of a particular grass, while important for soil conservation may impair maize response to N, decreasing... (AU)