Banca de DEFESA: CRISSOGNO MESQUITA DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CRISSOGNO MESQUITA DOS SANTOS
DATE: 29/07/2024
TIME: 08:00
LOCAL: Remota On Line
TITLE:

Mitigation of ammonia emissions after N-urea enriched vinasse application

KEY WORDS:

Urease inhibitor. Nitrogen fertilizer. NBPT. H3BO3. β-glucosidase. Arylsulphatase

PAGES: 55
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Fertilidade do Solo e Adubação
SUMMARY:

Sugarcane ethanol is an alternative renewable fuel source with a higher energy balance than
other crops, but its production generates a large volume of vinasse that requires appropriate
management. The application of vinasse can favor the biological characteristics of the soil,
mainly the activity of enzymes related to carbon (C) and sulfur (S) cycling due to its high
organic matter content. Furthermore, it can be an alternative for partial or total replacement of
mineral fertilizers, or a vehicle for nitrogen fertilizer. Nitrogen (N) added to vinasse consists of
the enrichment technique that favors the distribution of the fertilizer. There is evidence that the
association of vinasse with N-urea fertilizer is capable of reducing ammonia (NH3) emissions
into the atmosphere, but losses can still be significant. The use of compounds that inhibit the
urea hydrolysis process has the potential to reduce NH3 losses. However, to the best of our
knowledge, there are no studies using urease inhibitors (UI) in enriched vinasse, as well as the
short-term effect on biological activity after addition of vinasse enriched with urea and urease
inhibitors. Therefore, the present study aims to evaluate the efficiency of urease inhibitors in
reducing NH3 emissions from the application of vinasse enriched with N-urea and the potential
of management in increasing the activity of β-glucosidase and arylsulphatase. The study was
conducted in the Northeast region of Brazil under controlled greenhouse conditions. The
experimental design followed the randomized block model. The treatments were: 1) Control;
2) Urea - UR; 3) Vinasse + Urea – V + UR; 4) V + UR + NBPT and 5) V + UR + H3BO3. The
ammonia volatilization observed with the application of solid urea was 12.55% of the applied
N, stimulated by the high urease activity in the straw and urea-N retention in the straw. The
addition of urea to vinasse was efficient in reducing NH3 losses and presented losses of 1.83%
of the applied N. Urease inhibitors (NBPT and H3BO3) were not efficient in reducing NH3
volatilization when compared to the application of V + UR. The addition of urea-enriched
vinasse (with or without IU) increased β-glucosidase activity, but did not alter arylsulphatase
activity. In this sense, mixing V with UR can be considered an advantageous strategy to reduce
NH3 volatilization and increase the activity of enzymes related to C cycling in soils cultivated
with sugar cane. However, the addition of UI did not bring additional benefits and can be
discarded from this management system.

COMMITTEE MEMBERS:
Interno - EMIDIO CANTIDIO ALMEIDA DE OLIVEIRA
Externo à Instituição - MARCOS FERREIRA DE MENDONÇA
Externo à Instituição - RENATO LEMOS DOS SANTOS - IFPE