Banca de DEFESA: CLÉCIO LIMA TAVARES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CLÉCIO LIMA TAVARES
DATE: 27/10/2022
TIME: 08:00
LOCAL: Sala de aula do programa de mestrado em Produção Agricola
TITLE:

USE OF MODIFIED BIOCHAR IN THE CONDITIONING OF SOILS AFFECTED BY SALTS FOR AGRICULTURE IN THE SEMI-ARID OF PERNAMBUCO

KEY WORDS:

modified biochar; salinity; chemical properties; semi-arid region

PAGES: 51
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Manejo e Conservação do Solo
SUMMARY:

Biochar can be a great ally in the recovery of soils affected by salts, because it regulates the chemical and physical properties, besides providing recalcitrant organic matter. However, it is necessary to be cautious in its application; high doses of biochar can be harmful to soils, releasing large amounts of salts to the soil, and biochars are usually alkaline, which makes their application in saline soils unfeasible, and chemical modification can be an alternative to reduce this alkalinity. Arid and semi-arid regions, such as the Northeast region of Brazil, present great problems related to soil salinity. This occurs due to low precipitation and high evaporation, which results in the accumulation of soluble salts (Ca2+, Mg2+, K+ and Na+) and an increase of exchangeable sodium in the superficial layers because they cannot be leached. The objective of this work was to evaluate the chemical modification of chicken manure biochar and its effects on the remediation of salt-affected soils. The experimental design was entirely randomized, in a factorial scheme [(3 x 4) + 1] being the three treatments composed by soil + biochar without modification (SBSM), soil + biochar modified with hydrogen peroxide at 30% W/V (SBPH), soil + biochar modified with phosphoric acid at a concentration of 1 mol L-1 (SBAF), both with 4 doses, + control soil (ST), distributed in 4 repetitions. The biochar doses applied were equivalent to 5, 10, 15 and 20 Mg ha-1. These treatments were incubated in 1 dm3 plastic bags, and always irrigated with 80% of the field capacity, and then analyzed at 30 and 60 days. The chemical modification was efficient in reducing the alkalinity of the biochar, increasing ASE and porosity. The unmodified biochar potentiated soil salinity, while the modified biochar reduced salinity impacts. In the short term, the biochars were not able to provide organic carbon to the soil, and microbial activity showed greater responses to the modified ones in 60 days.

BANKING MEMBERS:
Presidente - MARCELO METRI CORREA - UFAPE
Interno - JOSE ROMUALDO DE SOUSA LIMA
Externa ao Programa - ***.352.124-** - MARIA CAMILA DE BARROS SILVA LEITE - UFRPE