Banca de QUALIFICAÇÃO: PEOLA REIS DE SOUZA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : PEOLA REIS DE SOUZA
DATE: 23/02/2023
TIME: 09:00
LOCAL: Realizado por videoconferência
TITLE:

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KEY WORDS:

Soil compaction; compression; penetration resistance; machine traffic

PAGES: 82
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUMMARY:

Oil palm produces one of the most demanded oils in the world, intended for food, with increasing use for the manufacture of biodiesel. The management of oil palm requires mechanized operations from soil preparation to fruit harvest. The workability or trafficability of the soil depends on the humidity at the time of operation. Oil palm plantations in the Amazon are subject to rainfall above 2,000 mm, a factor that contributes to the increased risk of soil compaction. The general objective of this research is to establish soil moisture suitable for management operations and the load bearing capacity of soil with oil palm in the state of Pará. The specific objectives are (i) to predict the range of limiting water contents for mechanized operations in order to reduce damage to the soil structure with oil palm; (ii) select a representative equation for the oil palm soil based on PR adjustment equations as a function of soil moisture and bulk density; (iii) quantify the effects of management zones on the temporal variation of PR and aeration porosity; (iv) predict the maximum pressure that oil palm soil can withstand without additional compaction. The study is being carried out on a farm in the municipality of Santa Bárbara, Pará, Brazil, in three oil palm plantations, where deformed and undisturbed samples were collected in three management zones (crown, traffic zone; planting row), in the depths 0-0.20 m, 0.20-0.40 m, 0.40-0.60 m. The range of limiting water contents for mechanized operations was predicted using van Genutchen equation parameters. We also determined the organic carbon, total porosity, macroporosity, microporosity and bulk density of the soil. Penetration resistance (RP) and aeration porosity are being used to characterize and quantify the effects of management through monitoring RP and gravimetric humidity for thirteen months, in the three depths and zones. Validation analysis, development and choice of PR fit between five equations will be performed. The maximum pressure that the soil with oil palm can withstand, without additional compaction, will be obtained through the axial compression test, carried out in management zones and adjacent area at two depths (0.025-0.05 m and 25.0-27.54 m). The water contents were influenced by the management zones, mainly in the surface layer. The most limiting contents for operations were found in the traffic zone. Organic carbon and bulk density influenced the range of water content in the subsurface layer. The soils were trafficked above the wet limit, mainly from November to May. The temporal evaluation of the RP and PA will allow identifying periods of restriction to oil palm growth, obtaining representative RP adjustments. The pre-consolidation pressure will reflect the load bearing capacity of the soil with cactus, important information for more sustainable planning of mechanized operations, taking into account soil moisture for decision making.

BANKING MEMBERS:
Externo à Instituição - RENATO PAIVA DE LIMA - ESALQ
Presidente - 1551186 - HERDJANIA VERAS DE LIMA
Externo à Instituição - MICHEL KEISUKE SATO - IFPA
Externa à Instituição - SUELI RODRIGUES - UFPI