Banca de QUALIFICAÇÃO: ELDERSON PEREIRA DA SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : ELDERSON PEREIRA DA SILVA
DATE: 26/03/2024
TIME: 09:00
LOCAL: Departamento de Agronomia
TITLE:

Current Status and Potential of Biological Nitrogen Fixation in Meeting the Growing N Demand of High-Yielding Soybean Crops - Brazil

KEY WORDS:

Glycine max, Inoculante para soja, Técnica da abundancia natural de 15N, balanço de N na cultura da soja.

PAGES: 1
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SUMMARY:

With each passing year, soybeans have been reaching new records of grain productivity, with some areas producing 195% more than the average soybean productivity in Brazil. These high productivity (above 4200 kg ha-1) require a large supply of nitrogen (N) from the agricultural system, which in Brazil, due to the poverty of the soil in available N, is considered that the high demand for N by the crop would be guaranteed almost exclusively by biological N fixation (FBN). In the last 14 years, only one work has been published on the topic, confirming the high efficiency of FBN (average of 88%) at field level in Brazil. During this time, several factors may have interfered with the efficiency of FBN, such as genetic improvement producing new varieties and the significant increase in soybean productivity achieved by producers, new technologies for soil management and plant nutrition and launches of more efficient inputs for the culture. The general objective of this project will be to evaluate the contribution of FBN at field level, in producer areas, using the 15N natural abundance technique in areas of high soybean productivity in different producing regions in Brazil. As a secondary objective, this project also intends to adjust the FBN quantification methodology through isotopic analysis of 15N in grains at crop harvest (R8). To this end, through a partnership with the Brazilian Soy Strategic Committee (CESB), at least 20 areas with a history of high soy productivity and/or that have been champions of the National Maximum Productivity Challenge promoted by CESB since 2008 will be evaluated. in the main producing regions of Brazil. Each representative area will be divided into 4 quadrants (~1ha) and within each quadrant a repeat sampling will be taken to be analyzed (biomass production, N accumulation, natural abundance of 15N). The contribution of FBN will be quantified using the 15N natural abundance technique. By estimating the N from the FBN and the total N accumulated by the plant, the N balance in the soil-plant system will be calculated, considering the N exported from the field with the grains as the N export variable from the system. Therefore, this project is expected to answer a big question: Whether the current FBN technique would have the potential to meet the high N demand of soybean crops in Brazil, if it is even possible to double the crop's average yields?

COMMITTEE MEMBERS:
Interna - 2466219 - CAMILA FERREIRA DE PINHO
Interno - ***.898.198-** - SEGUNDO SACRAMENTO URQUIAGA CABALLERO - EMBRAPA
Externa à Instituição - JANAINA RIBEIRO COSTA ROUWS - EMBRAPA