Banca de QUALIFICAÇÃO: RAIMUNDO LEONARDO LIMA DE OLIVEIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : RAIMUNDO LEONARDO LIMA DE OLIVEIRA
DATE: 26/02/2021
TIME: 14:00
LOCAL: Online
TITLE:

SOIL PHYSICAL AND HYDRICAL ATTRIBUTES IN AGRO-FORESTRY SYSTEMS WITH OIL PALM IN THE EASTERN AMAZON

KEY WORDS:

Physical attributes. Elaeis guineensis. Soil quality. Diversified system. Management zones.

PAGES: 74
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Física do Solo
SUMMARY:

Agroforestry systems (SAFs) with oil palm are land-use systems that can promote better soil quality, through the maintenance and improvement of soil properties and functions. However, in these diverse cultivation systems, there are few studies related to the influence of management on soil quality, through the analysis of physical-water properties and pore distribution. Given this context, the objective of our work was to evaluate whether the management and, if more diversified SAFs with oil palm affect the soil quality positively or negatively, through the temporal and spatial analysis of the physical-hydric properties and distribution of the soil pores in the eastern Amazon. We conducted the study in a less diversified agroforestry system, called (SAFs-ADU) and in a more diversified system that we call (SAFs-BIO), both with oil palm as a species of greater economic value. We collected deformed and deformed soil samples in layers 0-5; 5-10; 10-20; 20-30 and 30-50 cm in the oil palm crowning area (ACP), machine traffic location (CAR), stacking (PIL) and diversified range (DIV). In the laboratory, we determine soil density, porosity, total carbon content, aggregation, soil water retention curve and soil pore distribution. Precipitation is obtained by means of a pluviometer installed in the micrometeorological observation tower and volumetric humidity, with the aid of reflectometers in the frequency domain (FDR), installed in the soil profile. The penetration resistance (RP) we determine in the field, using a Stolf impact penetrometer with a cone angle of 30 °. The physical-water properties tend to vary in time and space depending on the management practices carried out on the soil. The management zones, oil palm crowning area, stacking and diversified range showed higher carbon content, aggregation, macroporosity, water retention, frequency of large pores and lower soil density, compared to the carrier. The oil palm in a more diversified system provided a higher carbon content, aggregation and a higher frequency of large pores in the 10-30 cm profile of the soil than in the less diverse system. The PR in periods of lower soil moisture reached values above the critical limit for plant growth and development. Therefore, the management practices in the systems provided distinct spatial and temporal variation of the physical-hydric properties and distribution of soil pores. Soil management, type of shelter and the presence of roots have different impacts on the physical and water properties. The cultivation of oil palm in more diversified agroforestry systems compared to less diverse systems, becomes an important option for the Amazon region, in the face of global changes, as it has contributed to a higher physical-hydric quality of the soil.

BANKING MEMBERS:
Presidente - 013.474.077-74 - STEEL SILVA VASCONCELOS - UFRA
Interna - 1551186 - HERDJANIA VERAS DE LIMA
Externo à Instituição - OSVALDO RYOHEI KATO - EMBRAPA
Externa à Instituição - SUELI RODRIGUES - UFPI