Banca de QUALIFICAÇÃO: LUCÉLIA ROSA DE JESUS COSTA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : LUCÉLIA ROSA DE JESUS COSTA
DATE: 20/07/2021
TIME: 14:00
LOCAL: Google Meet
TITLE:

SOIL FERTILITY IN DIVERSE OIL PALM CULTIVATION SYSTEMS IN EASTERN AMAZONIA

KEY WORDS:

Organic fertilization. Liming. Conservation management. Organic matter.
Soil quality

PAGES: 54
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Fertilidade do Solo e Adubação
SUMMARY:

Oil palm (Elaeis guineensis Jacq.) is an oleaginous palm tree widely cultivated in tropical
regions and of great economic importance, commonly used in the food, cosmetics and
biofuel industries. The cultivation of this palm tree in the Amazon has been carried out
for the most part in conventional ways (monoculture), however, the intensive use of this
practice may lead to soil biological, physical and chemical degradation. Diversified oil
palm systems associated to conservation management practices have been proposed to
improve soil quality by maintaining soil fertility. Thus, our objective was to evaluate
whether the diversified oil palm cultivation systems under conservation management
contribute to improvements in soil fertility compared to the forest. The study was
conducted in the municipality of Tomé-Açu, Pará, on a rural property belonging to the
SAF-Dendê project. In this property there are two diversified oil palm cultivation
systems:1) intercropping (oil palm + legumes); 2) agroforestry (oil palm + fruit and
timber species). A secondary forest was selected on this same property as a reference area
for comparing fertility with cropping systems. We named them all land cover systems.
Four plots were randomly established in each system. In the cultivations, the collection
of soil samples in the layers 0-5, 5-10, 10-20, 20-30 cm were carried out in specific places
within each plot (management zones): weeded circle (WC), harvest path (HP), frond leaf
(FP) and diversified strip (DV). In the forest, we demarcated a random point per plot for
soil sampling in the same layers of crops. We used one-way analysis of variance
(ANOVA) to assess the effects of land cover systems (intercropping, agroforestry and
forest) in the topsoil (0-20 cm) and depths along the soil profile (0-5, 5-10, 10-20 and 20-
30 cm) on the chemical attributes: active acidity (pH), calcium (Ca), magnesium (Mg),
potassium (K), phosphorus (P), aluminum (Al), matter organic (MO), potential acidity
(H+Al), potential cation exchange capacity (T), aluminum saturation (m%) and base
saturation (V%). In general, the acidity in crop soils was statistically lower than in the
forest for both arable and stratified depths. In the 0-20 depth, the pH was approximately
20% higher in crop soils than in forest soils. Nutrient contents (Ca, Mg, K and P) in the
soil of the crops were statistically higher than in the forest. The increases were 290, 280,
80 and 800%, respectively. The V% was on average 212% higher in crops than in the
forest. Liming, inorganic and organic fertilization and maintenance of organic matter on
the soil likely drive the improvement of soil fertility in oil palm cultivations. Therefore,
our results suggest that oil palm cultivation in diversified systems combined with the
conservation practices may contribute to the maintenance of soil fertility in Eastern
Amazonia.

BANKING MEMBERS:
Presidente - 013.474.077-74 - STEEL SILVA VASCONCELOS - UFRA
Interno - 2874082 - GILSON SERGIO BASTOS DE MATOS
Externo ao Programa - 060.454.498-78 - PAULO GUILHERME SALVADOR WADT - EMBRAPA
Externo à Instituição - RAFAEL SILVA GUEDES - UNIFESSPA