Banca de QUALIFICAÇÃO: HARRY SOUSA PAIVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : HARRY SOUSA PAIVA
DATA : 13/12/2019
HORA: 08:30
LOCAL: Parauapebas
TÍTULO:

FERTILIZATION STRATEGIES FOR THE GRASS Megathyrsus maximum cv. MOMBAÇA IN THE SOUTHEAST REGION OF PARÁ

PALAVRAS-CHAVES:

Tropical grasses. Pasture management. Tillering. Panicum maximum.

PÁGINAS: 30
GRANDE ÁREA: Ciências Agrárias
ÁREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
ESPECIALIDADE: Manejo e Conservação de Pastagens
RESUMO:

The objective of this study was to evaluate the productive characteristics of Megathyrsus maximum cv. Mombasa in the southeastern region of the state of Pará submitted to different fertilization strategies. The experimental design was a randomized complete block design in a 4 x 3 factorial arrangement, totaling 12 treatments with 5 replications. Four fertilization strategies were evaluated: 5ª Aproximação Manual (5AP), Pará Manual (PM), Nutrient Replacement (RP) and Michaelis and Menten adapted model (MM) associated with three nitrogen application times (day) ( N) after defoliation (day 0, 3 and 6) on total dry matter yield (TDM), leaf blade dry mass (LBDM), stem dry mass (SDM), dead material dry mass (DMD), leaf area index (LAI) and tillers density m^-2 (DT). There was interaction between the fertilization strategies and the days of N application for all analyzed variables, except for the LAI and TD, which were influenced only by the fertilization strategies. With the application of N fertilization on day 0, after defoliation, the 5AP, RP, PM and MM strategies presented, respectively, five, four, three and five production cycles. When N fertilization was performed on days 3 and 6 after defoliation, five, three, three and three cycles were recorded, respectively for the 5AP, RP, PM and MM strategies. The highest TDM value (12,109 kg DM ha^-1) was recorded for the 5AP nitrogen fertilization strategy on day 3 when compared to application on day 0 after defoliation. The other strategies did not differ (P> 0.05) from each other (10,455; 10,342 and 10,210 Kg of DM ha^-1 respectively for 5AP, RP and MM). Following the same behavior as TDM, LBDM was higher (11,919 kg ha^-1) in the 5AP strategy with N fertilization performed on day 3 after defoliation compared to application on day 0. The highest SDM production occurred for 5AP in day 3 (658.06 kg ha^-1), being superior to the treatments RP (251.38 kg ha^-1) and MM (222.56 kg ha^-1). For fertilization performed on day 0 the RP strategy produced the largest amount of dead material (1,209.6 kg ha^-1), followed by MM (676.63 kg ha^-1), which was higher than the PM (405.4 kg ha^-1). For the LAI the 5AP strategy obtained a mean value of 5.33 m² of leaf blade m^-2 of soil, being superior among the strategies evaluated in 28.9%; 30.8% and 39.4%, respectively for MM (3.79), RP (3.69) and PM (3.23), these in turn showed no differences between them. For TD the 5AP strategy presented higher tillering (421.5 m^-2) among the four fertilization strategies evaluated, being superior in 49.7%; 40.9% and 37.3%, respectively for PM, RP and MM. For higher dry matter production in Mombasa grass pasture, it is recommended to use the 5ª Aproximação Manual associated with nitrogen applications on the 3rd or 6th days after defoliation.

MEMBROS DA BANCA:
Presidente - 1143911 - RAYLON PEREIRA MACIEL
Interno - 1970202 - RICARDO SHIGUERU OKUMURA
Externo ao Programa - 1331235 - THIAGO CARVALHO DA SILVA
Externo à Instituição - RAIMUNDO LAERTON DE LIMA LEITE - IFRN