Banca de DEFESA: LETÍCIA GABRIELA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LETÍCIA GABRIELA SILVA
DATE: 14/07/2023
TIME: 13:30
LOCAL: Sala de Defesas/Reuniões do PPGCA/CSL
TITLE:

AGRONOMIC PERFORMANCE OF CORN HYBRIDS IN INTERACTION WITH PHOSPHATE SOLUBILIZING BACTERIA IN ENVIRONMENTS CONTRASTERS AS TO THE AVAILABILITY OF PHOSPHORUS

KEY WORDS:

Bacteria, Bioinsumption, Inoculation, Zea mays L

 

PAGES: 100
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Fertilidade do Solo e Adubação
SUMMARY:

The low level of phosphorus (P) available in the soil is one of the biggest
limitations to grain production. Phosphate fertilization has low efficiency due to the fact that a
large part of the added P becomes immobile or unavailable. Plants are not always efficient in
absorbing these nutrients, therefore the most pronounced subject today is the use of
bioinoculants that help absorb nutrients from the soil in a beneficial way. The objective of this
work was to evaluate and select experimental maize hybrids that have satisfactory agronomic
performance, in a contracting environment of phosphate fertilization and interaction with
phosphate solubilizing bacteria. The experiments were conducted in two consecutive years in
the 2021/2022 and 2022/2023 harvests. In each agricultural year, four trials were carried out
and in each one 36 corn hybrids were evaluated, in two areas characterized by soil fertility
and planting fertilization. In each area, there was a division in relation to seed inoculation,
which comprises in, namely: without inoculation and; seed inoculation with phosphate
solubilizing bacteria. The experimental design used was the 6x6 square lattice, 2 replications,
plots of two rows and the planting was carried out in a mechanized way. The characteristics
analyzed were productivity and components related to productivity and precocity. The data
were submitted to joint analysis of variance evaluating the tests and the hybrid x test
interaction, Scott-Knott test, correlation between characteristics, direct and indirect effects via
path analysis and finally the selection in several environments. There was a significant effect
for the source of variation hybrid and test in the two years of planting. For the hybrid x test
interaction, there was no significant effect for the first year, however, it showed a significant
interaction for the second year of planting. Hybrids 1Q2425, 1Q2363, 1R2622 and 1R2526
were the most responsive for the 2021/2022 season and hybrids 1Q2461, 1N1958, 1R2521
and 1Q2427 were the most responsive to productivity for the 2022/2023 season. The selection
in environments showed the hybrids 1R2536, 1Q2425, 1Q2366, 1Q2427 and 1Q2370 as the
most responsive to productivity in all tests.

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