Banca de DEFESA: LUANA MARQUES CAMPOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUANA MARQUES CAMPOS
DATA : 11/05/2021
HORA: 08:00
LOCAL: Vídeo conferência
TÍTULO:

Area conversion: effects on phosphorus dynamics and fertility of Amazonian soils

PALAVRAS-CHAVES:

Chemical phosphorus fractionation, dynamics between nutrients, Southern Amazon, pasture in the Amazon.

PÁGINAS: 60
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Química do Solo
RESUMO:

The process of opening and transforming forest areas into planted pastures, changes the dynamics of the environment, changes the cycling and availability of nutrients, with P being one of the most affected elements. Thus, the objective was to verify the changes in the chemical attributes of the soil and in the fractions of P in Amazonian soils cultivated with unfertilized pastures and with different opening times in relation to an area of native forest. The study was carried out in a Dystrophic RED LATOSOL and a Dystrophic RED-YELLOW ARGISOL. This research deals with an observational study where 6 areas were studied and the variables were the chemical attributes of the soil and the fractions of phosphorus in two depths (00-10 and 10-20 cm). The plots consisted of pasture areas of different ages, in Nova Guarita, MT, the pasture areas of 15 and 30 years old and adjacent native forest; in Alta Floresta, MT, the pasture areas of 20 and 35 years old and adjacent native forest. Within each plot, four experimental units were separated with dimensions of 10x50 m. Within each experimental unit, ten simple random soil samples were collected in the 00-10 and 10-20 cm layers. There was an effect of the opening time of the areas on the chemical attributes and fractions of phosphorus for LVd and PVAd. The nutrient content decreased in the studied pasture areas, in both soils, with the exception of the Ca and Mg content in the 35 years old pasture area, a fact that may be associated with animal supplementation. Phosphorus fractions considered labile decreased and non-labile fractions increased in both soils in pasture areas, as the opening time increased. The advance of land use time significantly influenced the chemical attributes and forms of phosphorus in the soil in the pasture areas compared to the native forest areas.

MEMBROS DA BANCA:
Presidente - 210865003 - GUSTAVO CAIONE
Interno - 117000004 - MARCO ANTONIO CAMILLO DE CARVALHO
Externo à Instituição - PAULO SÉRGIO PAVINATO - USP