Phosphate Rocks
Mostrando 1-12 de 22 artigos, teses e dissertações.
-
1. Apatite multi-generations in the Três Estradas Carbonatite, Southern Brazil: physical and chemistry meaning and implications to phosphate ore quality
Abstract Carbonatites were recently discovered in Southern Brazil, which increased the interest to evaluate the economic potential of these uncommon rocks, especially the Três Estradas Carbonatite. Carbonates are the dominant minerals of fresh rock followed by apatite, but the weathering process makes apatite abundant. We focused on apatite from the carbona
Braz. J. Geol.. Publicado em: 01/07/2019
-
2. Acid Ammonium Citrate as P Extractor for Fertilizers of Varying Solubility
ABSTRACT: There are several globally accepted methods to chemically characterize P-fertilizers, but not all are suitable to predict the agronomic efficiency of the P sources in terms of plant nutrition. Our aim was to investigate the performance of P extractors for fertilizers, investigating the consistency of different methods for P sources of varying prope
Rev. Bras. Ciênc. Solo. Publicado em: 20/12/2018
-
3. Is Composting a Route to Solubilize Low-Grade Phosphate Rocks and Improve MAP-Based Composts?
ABSTRACT: In alkalinized and Ca-rich composts, solubilization of apatite from phosphate rocks (PRs) is not guaranteed; however, chelating agents and humified substances produced during composting may alter the soluble contents and P forms of monoammonium phosphate (MAP)-based composts. These effects may depend on the proportions of organic wastes and P sourc
Rev. Bras. Ciênc. Solo. Publicado em: 15/02/2018
-
4. SUSTENTABILIDADE NO USO DO FÓSFORO: UMA QUESTÃO DE SEGURANÇA HÍDRICA E ALIMENTAR
The phosphorus used as fertilizer in agriculture is extracted from phosphate rocks, which after extraction reacts with sulfuric acid, releasing phosphoric acid, a raw material for the fertilizer industry. Studies point to a possible depletion of world reserves of phosphate rock in the next 50-100 years. A phosphorus scarcity is closely linked to global food
Quím. Nova. Publicado em: 2016-07
-
5. Rock biofertilizer and earthworm compost on sugarcane performance and soil attributes in two consecutive years
ABSTRACT The deployment of soluble fertilizers has been one of the most commonly applied agricultural practices in the bid to increase crop yield. However, the production of soluble fertilizers has a considerable economic cost and consumes a substantial amount of energy. In general, soil organic matter provides the nutrients needed for plant growth in organi
Sci. agric. (Piracicaba, Braz.). Publicado em: 2016-02
-
6. Efeito de enxofre elementar na eficiência de fosfatos naturais / Effect of elemental sulfur on the efficiency of phosphate rocks
É amplamente conhecida a importância do fósforo (P) para a obtenção de boa produtividade de culturas. Sabe-se, também, que a matéria prima para produção de adubos fosfatados é um recurso escasso e não renovável. Utilizações adequadas e alternativas que busquem melhorias da eficiência das fontes de P são de grande importância para o manejo da
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/06/2012
-
7. Release of potassium from rock powder by the yeast Torulaspora globosa
The alteration of minerals in rocks and the availability of elements for plant nutrition require long periods of time, and microorganisms are thought to induce the release of potassium and phosphate from rocks. In this context, this work evaluates the role of the yeast Torulaspora globosa, isolated from the sugar cane rhizosphere, in the solubilization of po
Brazilian Archives of Biology and Technology. Publicado em: 2012-08
-
8. Reações de obtenção de NOx empregado no processo Humifert para a produção de compostos organofosfatados. / NOx reactions applied in a organophosphated compounds production by Humifert process.
Humiphert process is an alternative used for producing phosphated compound fertilizers with a slower solubilization when compared to other traditional fertilizers, resulting in a longer period of plant nutrition. During the process, phosphatic rocks are used along with some sort of limitation according to the normal development, both by their lower content p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/05/2011
-
9. Chemical attributes of an Argisoil of the Vale do São Francisco after melon growth with phosphate and potash rocks biofertilizers.
2009
Horticultura Brasileira. Publicado em: 2011
-
10. Implementação e aplicação de metodologia para dosagem de metais e não metais em águas de drenagem de solo adubados com fosfogesso
Phosphogysum is a waste generated in phosphoric acid production by the wet process. The immense amount of phosphogysum yearly produced (around 150 million tons) is receiving attention from environmental protection agencies all over the word, given its potential of contamination. In Brazil, this material has been used for many decades, especially for agricult
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/04/2010
-
11. Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos
Monazite structural group includes arsenates, phosphates, and silicates, with general formulae A B O4 , (A = Bi, Ca, Rare Earth Elements, Th, U and B = As5+, P5+, Si4+). Among them, the phosphate monazite is the most abundant independent Rare Earth Element mineral, occurring in several geological sites. It presents a variable composition and morphology and h
Publicado em: 2010
-
12. Tratamento de esgoto sanitário em sistemas alagados construídos utilizando Typha angustifolia e Phragmites australis / Sanitary sewer treatment in constructed wetlands system using Typha angustifolia and Phragmites australis
This study aimed to assess the efficiency of two vegetal species in the treatment of the sanitary sewer, in constructed wetlands system. Specifically, it aimed to evaluate the efficiency of the species Typha angustifolia (narrow-leaf cattail) and Phragmites australis (common reed), in their possible combinations, in the treatment of the sanitary sewer, in a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/08/2009