Banca de DEFESA: ANDERSON DE SOUZA GALLO
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.DISCENTE : ANDERSON DE SOUZA GALLO
DATA : 27/02/2020
HORA: 09:00
LOCAL: Biblioteca setorial do PPGA-CS
TÍTULO:
Spatial variability of phosphorus forms in soil under conservation management in the integrated agroecological production system, Seropédica - RJ
PALAVRAS-CHAVES:
Scientific collaboration. Sequential extraction. Organic phosphorus. Sustainable management. Phosphorus recycling
PÁGINAS: 60
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Fertilidade do Solo e Adubação
RESUMO:
Phosphorus (P) is an essential nutrient for maintaining the life of all organisms. It is among the most important elements for plant vigor and development. However, it has a strong tendency to react with soil components, adsorbing to colloids or forming low solubility compounds with other ions, making them unavailable to plants. Thus, the adoption of large scale fertilizers is necessary to ensure wide availability of P to plants. Given this scenario, alternative management strategies to reduce dependence on P fertilizer and use it more efficiently should be employed. Thus, knowledge of the dynamics of P transformations in the soil is fundamental. Soil P is divided into two large groups, inorganic P and organic P. Organic P encompasses microbial biomass and products from decomposition of organic matter, so conservationist systems with frequent input of organic matter may favor the levels of the organic fraction of P, which after mineralization constitutes a source of P for plants. These characteristics have increased the scientific interest in accessing organic P for plant production, increasing the number of publications on organic P in the last two decades. The objective of this work was to evaluate the spatial variability of phosphorus forms in soil under conservation management. In addition, in order to evaluate the relevance of organic P in agricultural soils, a study of the structure and evolution of scientific production on organic P of soil at a global level was carried out using a bibliometric approach. To evaluate the structure and evolution of the scientific production on organic P (chapter I), searches were performed by indexed works in the Web of Science database, from 1998-2018. The bibliometric indicators determined were: (a) number of publications per year; (b) number of citations per year; (c) number of publications by authors; (d) number of publications by country and institution; (e) main journals and (f) most cited articles. To evaluate the spatial variability of phosphorus forms in soil under conservation management (chapter II). The studied area is constituted by an experimental module of organic vegetable production, located in the city of Seropédica - RJ. Soil samples were collected in 72 points of the area, with grid of points every 10 meters. Samples were taken at five depths, being 0-0.5 m; 0.5-0.10 m; 0.10-0.20 m; 0.20-0.40 m and 0.40-0.60 m. The labile, moderately labile and moderately resistant fractions of the inorganic and organic forms of P were extracted, as well as the residual P and total P (sum of all fractions). In addition, some chemical and physical soil attributes (routine fertility and particle size analyzes), as well as remaining P, pseudototal Fe content and soil moisture were determined to correlate these attributes with the distribution of P forms in the soil.
MEMBROS DA BANCA:
Externo à Instituição - EDNALDO DA SILVA ARAÚJO - EMBRAPA
Presidente - 386715 - EDUARDO LIMA
Externo à Instituição - JOSÉ DE SOUZA OLIVEIRA FILHO - UECE
Externo ao Programa - 1282206 - JULIANO BAHIENSE STAFANATO
Interno - 1220296 - MARCOS BACIS CEDDIA