Banca de DEFESA: JAMES LUAN NOLETO LEITE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JAMES LUAN NOLETO LEITE
DATE: 30/08/2021
TIME: 15:00
LOCAL: Sala virtual
TITLE:

EVALUATION OF LITHOTHAMNION IN THE INITIAL PRODUCTION OF MOMBAÇA GRASS (Megathyrsus maximus cv. Mombaça) SUBMITTED TO DIFFERENT PHOSPHORUS DOSES

KEY WORDS:

Lithothamnium. Correction of soil acidity. eastern Amazon

PAGES: 40
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUMMARY:

This study aimed to study the application of lithothamnium calcarium in the implantation and production of Mombaça grass in the eastern Brazilian Amazon, evaluating its viability as a soil acidity corrector and as a phosphate fertilizer conditioner, comparing it with the lime-phosphorus association . The experiment was conducted from January 2019 to March 2021 in the experimental area of the Federal University of South and Southeast of Pará, Marabá campus. The experimental design adopted was randomized blocks, in a 3x3 factorial scheme, with three corrective strategies for soil acidity and three P doses, with 5 replications, the three correctives being; 1st limestone, 2nd lithotamnium, 3rd control (without corrective), and three doses of phosphorus: 1st 60kg, 80kg and 3rd100kg. The morphogenic, structural and productive characteristics of Mombaça grass were evaluated twice a week during the experiment. The leveling cut was performed as soon as the average height of the treatments reached 0.70 m, where they were lowered to a residual height of 0.30 m. Data were subjected to analysis of variance and tukey test at 5% probability. there was a significant interaction in the treatments that received lime and phosphorus dose 80 kg/ha in the parameters: production of dry matter per bed, leaf production and production of dead material, these beds had a lower productivity in these variables when compared to other treatments . This result can be explained by the interaction of phosphorus with limestone, where phosphorus may have precipitated with Ca, Fe and Al, and become unavailable for forage. For the other structural and productive factors there was no significant mean difference. Based on the results presented, lithotamnium had better Ca and Mg indices, had great potential as a soil acidity corrector, and in this first year of production it had a better interaction with phosphorus for certain parameters, when compared to treatments with the limestone. However, it is necessary that a long-term study takes place since, during the productive years, the phosphorus retained in the treatments with limestone may return to the soil solution.

BANKING MEMBERS:
Interno - 1143911 - RAYLON PEREIRA MACIEL
Externa à Instituição - SANDRA GALBEIRO
Externo à Instituição - EDUARDO LUCAS TERRA PEIXOTO - UFPA
Externo à Instituição - JOSE ANCHIETA DE ARAUJO - UNIFESSPA
Externa à Instituição - LINNAJARA DE VASCONCELOS MARTINS FERREIRA - IFPA