Banca de DEFESA: JOEL JOSÉ DE ANDRADE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOEL JOSÉ DE ANDRADE
DATE: 06/08/2021
TIME: 08:30
LOCAL: Defesa remota pelo Google Meet
TITLE:

Efficiency of foliar nitrogen fertilization on sugarcane

KEY WORDS:

Plant nutrition, N assimilation, fertilization management, N-fertilizer leaching.

PAGES: 73
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Fertilidade do Solo e Adubação
SUMMARY:

The losses of N in the soil-plant system to atmosphere in the management of fertilization limit the availability of N in the sugarcane fields. To minimize leaching losses and improve recovery, strategies such as forms, sources, timing of application and modification of the agroecosystem have been tested, but the fertilization efficiency has been less than 50%. Alternatively, the use of urea in foliar fertilization has shown efficiency of 70% in applications. The objective of this work is to evaluate the efficiency of foliar N-urea fertilization in the recovery and development of sugarcane. Seven N application managements with doses of 60 kg ha-1 combining reduction of fertilization via soil and foliar complementation, plus an extra treatment with application of 120 kg ha-1 of N via soil, were arranged in randomized blocks with three repetitions. In the first seven months N leaching was evaluated. At 156 DAP, 194 DAP and 220 DAP, nitrogen fertilization efficiency, growth, development and biomass accumulation in the shoot were evaluated. The lowest concentrations of N in the leachate were verified in managements with a reduction of the N dose by 50% and 25%. In these managements, the N-nitric had greater participation in the solution, which promoted greater leaching. Foliar fertilization optimized 15N-fertilizer uptake and increased N content and accumulation, biomass production, plant height, and number of internodes. The best responses were identified in the management with a 50% reduction of the dose in the soil with complementation of two 15 kg ha-1 N applications. In this context, it is concluded that it is possible to reduce the input of N in the soil and complement it via the leaves without compromising the development and accumulation of biomass in the aboveground part of the sugarcane in the sugarcane plant cycle.

BANKING MEMBERS:
Externo à Instituição - PAULO CESAR OCHEUZE TRIVELIN
Externo ao Programa - 2114713 - ALEXANDRE CAMPELO DE OLIVEIRA
Presidente - 1794246 - EMIDIO CANTIDIO ALMEIDA DE OLIVEIRA