Banca de DEFESA: GABRIELLA FRANCISCO PEREIRA BORGES DE OLIVEIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : GABRIELLA FRANCISCO PEREIRA BORGES DE OLIVEIRA
DATE: 28/04/2023
TIME: 14:00
LOCAL: VIDEOCONFERÊNCIA
TITLE:

lnfluence of liming with Lithothamniumcalcareum on absorption of nutrients by corn culture and on leaching and persistence of atrazine and S-metolachlor herbicides in soil.

KEY WORDS:

Seaweed.Triazines.Chloroacetalinides.

PAGES: 110
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUMMARY:

Soil incubation was performed with dolomitic limestone and Lithothamniumcalcareum for soil pH equal to 6.0. Assay to evaluate the growth and absorption of nutrients by maize plants was carried out up to 42 days after emergence (DAE), proceeding with the collection of the plants. Plants were analyzed for shoot height (SH), root height (RH), shoot dry mass (SDM) and root dry mass (RDM), as well as determining nutrient levels in plant tissues. The leaching potential of atrazine and S-metolachlor was estimated in PVC columns filled with soil, taking samples every 10 cm for ultra performance liquid chromatography (UHPLC) analysis. The persistence of atrazine and S-metolachlor was evaluated by collecting soil samples at different times between 1 and 150 days after application (DAA) of herbicides in the soil. Soil samples were analyzed by UHPLC and by biological assay. Higher means of SH, RH, SDM and RDM were observed in the soil with liming compared to the soil without liming. Calcium and magnesium contents in plant tissues were higher in soil with liming compared to soil without liming and micronutrients contents were higher in soil without liming compared to soil with liming. The soil without liming showed a higher concentration of atrazine up to 20 cm depth and the treatments with dolomitic limestone and Lithothamniumcalcareum showed a higher concentration of atrazine at a depth of 30 to 40 cm and 10 to 20 cm, respectively. The soil without liming showed a higher concentration of S-metolachlor at a depth of 20 to 30 cm and the treatments with dolomitic limestone and Lithothamniumcalcareum showed a higher concentration of S-metolachlor at a depth of 10 to 20 cm and from 0 to 10 cm, respectively. The half-life of the atrazine herbicide was equal to 8 days for all treatments and of the S-metolachlor herbicide was equal to 12 days for the soil without liming and with liming using Lithothamniumcalcareum and equal to 13 days for the soil with liming using dolomitic limestone. Cucumber plants were controlled up to 90 DAA for all treatments. The sorghum plants were controlled up to 15 DAA in the soil without liming and up to 30 DAA in the soil with liming using dolomitic limestone and Lithothamniumcalcareum. Soil liming favors maize plant growth in a similar way for both calcium sources. Soil liming favors the absorption of calcium and magnesium and disfavors the absorption of micronutrients. Soil liming increases the leaching potential of the atrazine herbicide and reduces the leaching potential of the S-metolachlor herbicide, with the sorption capacity of Lithothamniumcalcareum being greater compared to dolomitic limestone for both herbicides. Soil liming does not significantly alter the half-life of atrazine and S-metolachlor herbicides, but promotes increased persistence of S-metolachlor herbicide in the soil using both dolomitic limestone and Lithothamniumcalcareum.

COMMITTEE MEMBERS:
Externo ao Programa - 1759225 - ALEXANDRE LIOI NASCENTES - nullExterna ao Programa - 2466219 - CAMILA FERREIRA DE PINHO - nullExterna à Instituição - CRISTINA MOLL HUTHER - UFF
Externo à Instituição - Daniel Valadão Silva - UFERSA
Externa ao Programa - 1412091 - ERICA SOUTO ABREU LIMA - nullInterno - 387263 - NELSON MOURA BRASIL DO AMARAL SOBRINHO