Banca de QUALIFICAÇÃO: THAIANY FERNANDES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : THAIANY FERNANDES
DATA : 22/09/2020
HORA: 08:30
LOCAL: google meet
TÍTULO:

PHYTOSOCIOLOGICAL SURVEY AND CHEMICAL CONTROL OF WEEDS IN PINEAPPLE CULTIVATION (Ananas comosus)

PALAVRAS-CHAVES:

Phytosociology; weed plants; selectivity.

PÁGINAS: 88
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitotecnia
ESPECIALIDADE: Matologia
RESUMO:

Pineapple farming represents one of the most important fruit segments in Brazil, being among the three main fruits in production and value in fruit farming. However, there are factors that may influence its production and productivity, being the interference of weeds in the culture one of the most important. Therefore, this study aimed to identify the weeds present during the whole cycle of the pineapple crop in the field and to evaluate and compare the efficacy of herbicides applied in the control of weeds in the pineapple crop. The method used to perform the phytosociological survey of weeds in two areas cultivated with the pineapple crop at different times (120, 240 and 360 days after planting) was the inventory square (0.25 x 0.25 m) randomly cast 25 times between the rows of the crop. The plants were identified by species, popular name and family. Then, frequency, relative frequency, density, relative density, abundance, importance value index and importance value index were calculated. To evaluate the effects of the application in directed jet and total area of herbicides on the pineapple crop, the pearl cultivar was used, at 1,20 x 0,40 x 0,40 m spacing. The experimental design was that of randomized blocks, with treatments in a 9 x 2 x 2 factorial scheme, with four repetitions, in which the first factor represented the herbicides sulfentrazone (700 g i.a ha-1), diurom (3,200 g i.a ha-1), clethodim (144 g i.a ha-1), atrazine (3,000 g i.a ha-1), hexazinone+diurom (396 + 1,404 g i. a ha-1), s-metolachlor (1,920 g i.a ha-1), trifluralin (1,335 g i.a ha-1), pendimethalin (1,400 g i.a ha-1), the second one the two witnesses, one weeding and the other without weeding, and the third one two modes of application directed jet (with protection of the seedlings with napoleon hat) and in total area (without protection of the plants). The application of the herbicides was done 20 days after the planting of the crop, using a CO2 pressurized costal sprayer. In general, the species found exposed characteristics such as aggressive competition for resources such as water, light and nutrients, high seed production, rapid growth, irregular germination. Furthermore, the phytosociological survey of weeds in a single area or time of year does not represent the potential for infestation of these areas. Therefore, it was observed that the most important time for weed management in pineapple cultivation is close to 120 DAP, period in which there was the highest number of weed species. And the most expressive present in most indexes with high potential to infest the cultivation of pineapple were Euphorbia heterophylla, Ipomoea triloba, Chamaesyce hirta, Sida rhombifolia, Eulesine indica, Digitaria spp., Priva bahiensis, Bidens pilosa, Cenchrus echinatus, Urochloa decumbens and Rottboellia cochinchensis.

MEMBROS DA BANCA:
Presidente - 221918004 - MIRIAM HIROKO INOUE
Interno - 253848001 - ANA CAROLINA DIAS GUIMARAES
Externo à Instituição - CLEBER DANIEL DE GOES MACIEL - UNICENTRO