Banca de QUALIFICAÇÃO: JUSCELINO GONÇALVES PALHETA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : JUSCELINO GONÇALVES PALHETA
DATE: 24/02/2021
TIME: 14:00
LOCAL: Por meio de chamada por videoconferência
TITLE:

ASSOCIATION OF Azospirillum brasilense WITH NITROGEN FERTILIZERS WITH INCREASED GROWTH EFFICIENCY, GAS EXCHANGES AND NUTRITIONAL CONTENT IN CORN HYBRID

KEY WORDS:

Nitrogen fertilization. Biological nitrogen fixation. Urease inhibitor. Zea mays L.

PAGES: 75
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUMMARY:

One of the limiting factors in the productivity of corn in the State of Pará is the lack of information regarding the benefits of adopting growth-promoting bacteria and the management of nitrogen fertilization. In general, farmers have adapted the recommendations for fertilizing maize grown in the south of the country for the northern states, since research data for the crop is scarce in the region. In turn, due to differences in yield potential between corn hybrids, fertilizer doses may be overestimated and / or underestimated. Thus, this study aimed to evaluate the vegetative, physiological and nutritional status of corn inoculated with Azospirillum brasilense associated with nitrogen sources and doses. The experiment was carried out in a complete randomized block design, in a 4 x 2 x 2 factorial scheme, with four replicates each, as specified: four doses of N (0; 60; 120 and 180 kg ha-1 of N), two sources of N (common urea and urea treated with urease inhibitor - NBPT) and absence and presence of inoculation with Azospirillum brasilense. The evaluations consisted of the vegetative growth of the plant, the gas exchange and the concentration of macronutrients in the root, stem and leaf of the corn. The results identified that the inoculation of the corn seeds with the bacteria and the use of nitrogen fertilization, regardless of the sources, promoted an improvement in the vegetative growth of the hybrid, improving the vegetative development and the physiological responses of corn, especially when applied at 180 kg / ha of N. The increase in N doses and inoculation with the bacterium also influenced the concentration of macronutrients in corn. However, the dose of 180 kg ha-1 of N associated with seed inoculation with Azospirillum brasilense, provided a higher concentration of macronutrients in corn, regardless of the application of common urea or urea treated with a urease inhibitor.

BANKING MEMBERS:
Presidente - 1970202 - RICARDO SHIGUERU OKUMURA
Externo ao Programa - 2595267 - CANDIDO FERREIRA DE OLIVEIRA NETO
Externo à Instituição - EDUARDO CEZAR MEDEIROS SALDANHA - YARA
Externo à Instituição - GERSON DIEGO PAMPLONA ALBUQUERQUE - UFRA