Banca de DEFESA: ROBERTO PATEL JUNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ROBERTO PATEL JUNIOR
DATA : 19/02/2021
HORA: 08:30
LOCAL: Alta Floresta-MT
TÍTULO:

COMPETITIVE SKILL AND SELECTIVITY OF AMAZON BIOME PASTURES

PALAVRAS-CHAVES:

Atrazine. Drone. mombasa grass. massai grass. Paspalum virgatum L.. Amazonia.

PÁGINAS: 56
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitotecnia
ESPECIALIDADE: Matologia
RESUMO:

Agricultural and livestock activities carried out in the Amazon region have been criticized in recent years, and the pressure for a production system that is less impactful to the environment is constantly growing. Many ranchers in northern Mato Grosso have faced serious problems with the degradation of pastures, causing large productivity losses. It is estimated that around 50% of Brazilian pastures are degraded, reducing productivity and animal support capacity, and consequentre placement of forage plants by invasive plants. The degree of competition and interference of invasive plants is related to the morphological and physiological characteristics of the weed community. In this scenario, many ranchers opt for the complete reform of the pasture, replacing the forage species, without first performing a complete and efficient diagnosis of the area and then applying the necessary control methods and the proper corrections of soil fertility, which ends up continuing the degradation processes. Therefore, performing an accurate diagnosis of the area, evaluating the levels of degradation and defining strategies for the recovery of degraded areas is fundamental for the advancement of a concise, efficient and sustainable system. To evaluate the initial weed and forage weeds in the initial phase of the crop at three levels of soil fertility. And to evaluate the selectivity and efficiency of pre-emergent herbicide control in pasture. Article 1 aimed to study the relationship of productive interference caused by the forest competition between the weed species Paspalum virgatum L. (grass - razor) and the forage species Panicum maximum cv. Mombaça, in three different levels of soil fertility. The experiment was conducted in a greenhouse at the University Campus of Alta Floresta - UNEMAT, with the substitute series methodology, with three levels of soil fertility, thus composing a 5x3 factorial scheme. The variables were evaluated at 60 DAE, being plant height, number of byes, and shoot dry mass. The data were analyzed using the graphical analysis method, constructing diagrams based on yields or relative and total variations. The competitiveness indexes, grouping coefficient and relative aggressiveness were also determined. This article describes the results of interference of the initial forest competition on the different levels of soil fertility. Article 2 was conducted in a rural property in Alta Floresta - MT, with the objective of evaluating the weed control efficiency of the herbicide atrazine, applied in pre-emergence on the initial pasture formation of the species Panicum maximum cv. Massai. The experimental design used was in ranges, with factorial 8 x 2 with three replications, being 48 plots of 5 x 6 m, where the treatments consisted of eight doses of the herbicide atrazine applied in pre-emergence in two planting systems, no-go and conventional. The variables were analyzed at 60 DAA, which were the presence of phytotoxicity, DM accumulation and height of Massai grass plants, and visual evaluation of weed control efficiency. The data were submitted to variance analysis with application of the F test. In this article, the results and discussions about herbicide control efficiency in initial pasture formation are described.

MEMBROS DA BANCA:
Presidente - 253848001 - ANA CAROLINA DIAS GUIMARAES
Interno - 221918004 - MIRIAM HIROKO INOUE
Externo à Instituição - KASSIO FERREIRA MENDES - UFV