Characterization and Agronomic Evaluation of Single Superphosphates Varying in Iron Phosphate Impurities

Prochnow, Luís Ignácio; Chien, S. H.; Taylor, Robert W.; Carmona, G.; Henao, J.; Dillard, E. F.

doi:10.2134/agronj2003.0293

Cited by 27 publications

(34 citation statements)

References 1 publication

(1 reference statement)

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“…The LG SSP was obtained by acidulation with sulfuric acid of the "reflotable" concentrate of the Araxá apatite. This source of P contains low watersoluble compounds of the type Fe-Al-P, as described in Prochnow et al (2003a;2003b). The H14 compound is very low in water solubility and found as a byproduct of phosphoric acid production and, also, as a component of the water-insoluble fraction of triple superphosphates (Lehr et al, 1967;Frazier et al, 1991).…”

Section: Methodsmentioning

confidence: 97%

“…A combined multiple-regression analysis using a dummy variable was performed for all P sources. This resulted in a common intercept and a single value of standard deviation and coefficient of determination (Chien et al, 1990;Prochnow et al, 2003b). Three response functions (linear, semi-log and square root) were tested to describe the relationship between the parameters studied, and the one presenting the greatest R 2 was chosen.…”

Section: Methodsmentioning

confidence: 99%

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Effectiveness of phosphate fertilizers of diffrent water solubilities in relation to soil phophorus adsorption

Prochnow¹,

Quispe

Francisco

et al. 2006

Sci. agric. (Piracicaba, Braz.)

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Phosphate fertilizers should match soil attributes to enhance agronomic effectiveness and recovery by plants. The purpose of this study was to test the agronomic effectiveness of P sources varying in water solubility on two soils differing widely in P adsorption capacity (PAC). Soils selected for the study were Oxisols with very low available P and presenting low and high PAC (Ox-LPAC and Ox-HPAC, respectively). Both were limed to pH 5.4 in a greenhouse study conducted utilizing corn as the test crop. Treatments consisted of the two soils interacting with five P sources (monocalcium phosphate -MCP, low-grade single superphosphate -LG-SSP, multimagnesium phosphate -MMP, Arad phosphate rock -PR and a P impurity in triple superphosphate -H14), and four rates of P (12.5, 25.0, 50.0 and 100.0 mg kg -1 ). A control with no P was added for each soil. The treatments were arranged as blocks with three replicates. Plants were harvested 45 d after germination. Dry-matter yield and P uptake were measured and the relative agronomic effectiveness (RAE) compared with MCP as the standard. When applied in low rates of P (12.5 and 25.0 mg kg -1 ) the RAE of the alternative sources was higher in the soil with high PAC (45, 66, 39 and 65% in the Ox-HPAC for the LG-SSP, MMP, PR and H14, respectively, as opposed to 24, 40, 14 and 47% in the Ox-LPAC). Results suggest that sources of P with low water solubility can be agronomically more effective in soils with high PAC. Key words: alternative phosphorus sources, relative efficiency, solubility ADSORÇÃO DE FÓSFORO PELO SOLO E EFICIÊNCIA DE FERTILIZANTES FOSFATADOS COM DIFERENTE SOLUBILIDADE EM ÁGUARESUMO: Fertilizantes fosfatados devem ser aplicados tendo em vista os atributos do solo. Este estudo foi conduzido para testar fontes de P, distintas quanto à solubilidade, na eficiência agronômica em solos com diferença marcante na capacidade de adsorção de P (CAP). Foram selecionados dois Latossolos com teor muito baixo de P e apresentando baixa e elevada CAP (Lat-BCAP e Lat-ECAP, respectivamente). Ambos foram corrigidos para pH 5,4 e utilizados em experimento em casa-de-vegetação com milho. Os tratamentos foram cinco fontes de P com solubilidade em água diferente (fosfato monocálcico -FMC, "low-grade" superfosfato simples -LG-SSP, multifosfato magnesiano -MFM, fosfato de rocha de Arad -FR, e uma impureza de superfosfatos triplos -H14), aplicadas em quatro doses (12,5, 25,0, 50,0 e 100,0 mg kg -1 ) mais um controle, em três repetições.

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Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Effectiveness of phosphate fertilizers of diffrent water solubilities in relation to soil phophorus adsorption

Prochnow¹,

Quispe

Francisco

et al. 2006

Sci. agric. (Piracicaba, Braz.)

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“…Levando em consideração a necessidade de se calibrar uma dose eficiente e econômica de fósforo a ser aplicada e que as reservas de rochas fosfatadas no país são escassas, e aliado aos altos custos de importação deste fertilizante, e também ao fato de que o nutriente é um recurso não renovável, justificam-se estudos para otimizar a eficiência no uso de fertilizantes fosfatados (Prochnow et al, 2003).…”

Section: Adubação Química Fosfatada Na Cultura Do Milhounclassified

Fertilización organomineral y NPK en el cultivo maíz (Zea mays L.)

Malaquias

Santos

2017

Pubvet

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RESUMO. Na atualidade é notável a evidente preocupação com nosso sistema produtivo em atender as premissas do desenvolvimento sustentável, atentando para o cumprimento dos pilares que o fundamentam sendo eles de cunho econômico, social e ambiental. Os fertilizantes organominerais são uma boa alternativa, sendo composto basicamente de uma mistura de fertilizantes minerais e orgânicos, que apresentam potencial de uso agrícola, pois tendem a ter um menor custo em relação aos fertilizantes químicos, e advém de resíduos de outros sistemas produtivos como por exemplo a cama de frango, viabilizando investimentos em seu uso e pesquisa muito por atender os ideais de conscientização crescente de uma produção, manejo e desenvolvimento rural sustentável. A utilização da matéria orgânica permite que se tenha uma racionalização do adubo mineral, promovendo um aumento da capacidade de troca catiônica (T), reduzindo perdas por lixiviação e auxiliando na liberação dos nutrientes a planta, contribuindo para elevar a produtividade. Objetivou-se com este trabalho verificar parâmetros de produtividade em relação ao comportamento da utilização da adubação estritamente química e convencional contrapondo-se a adubação organomineral, visando desenvolvimento sustentável, fornecimento, solubilização e efeito residual de nutrientes no solo, reutilização de subprodutos e custos de produção.Palavras chave: Composto, desenvolvimento, fertilização, solo, sustentabilidade Organomineral fertilization and NPK in corn (Zea mays L.)ABSTRACT. At present, the obvious concern with our productive system is to attend to the premises of sustainable development, paying attention to the fulfillment of the pillars that base it being of an economic, social and environmental nature. Organomineral fertilizers are a good alternative, being basically composed of a mixture of mineral and organic fertilizers, which present potential for agricultural use, since they tend to have a lower cost in relation to chemical fertilizers, and comes from residues from other productive systems such as Such as the chicken litter, allowing investments in its use and research to meet the growing awareness of production, management and sustainable rural development. The use of organic matter allows for a rationalization of the mineral fertilizer, promoting an increase in the cation exchange capacity (T), reducing leaching losses and aiding in the release of nutrients to the plant, contributing to increase productivity. The objective of this study was to verify productivity parameters in relation to the behavior of the use of strictly chemical and conventional fertilization, as opposed to organomineral fertilization, aiming at sustainable development, supply, solubilization and residual effect of nutrients in the soil, reuse of by-products and costs of production.Keywords: Composting, development, fertility, soil, sustainability Fertilización organomineral y NPK en el cultivo maíz (Zea mays L.)

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“…For many phosphate rocks (PR), high amounts of contaminants or even some apatite bounded to contaminants are presently being discarded to adequate the apatite concentrates to the standards set by the legislation of several countries by producing high water-soluble APF (Brazil, 1982;Official Journal of the European Communities, 1975 (Lehr et al, 1967;Frazier et al, 1991;Prochnow et al, 2003b). H8 preferentially forms at P 2 O 5 concentrations below 39 % and H14 forms at P 2 O 5 concentrations in the range of 39 to 70 % (Frazier et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…Some studies were carried out on the agronomic effectiveness of APF with lower water solubility, due to the presence of compounds of the Fe-Al-P type and compared to those specified by legislation (high in water solubility and almost free of Fe-Al-P compounds). Many greenhouse and some field studies suggest that the level of impurities in APF would have to be increased above current levels before effectiveness would be affected (Mullins & Sikora, 1992, 1995Sikora et al, 1989;Prochnow et al, 2003aProchnow et al, , 2003b. Better use of low-grade PR is possible by producing agronomically effective APF varying in water solubility (Lehr, 1980).…”

Section: Introductionmentioning

confidence: 99%

Activity of phosphorus of synthetic Fe-K-P compounds in superphosphate fertilizers as affected by pH and ionic strength

Prochnow¹,

Biasioli²,

Rodella³

et al. 2006

Rev. Bras. Ciênc. Solo

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SUMMARYThe concentration of orthophosphate ions released from Fe-K-P compounds (Fe 3 KH 8 (PO 4 ) 6 .6H 2 O and Fe 3 KH 14 (PO 4 ) 8 .4H 2 O) present in superphosphates increases with pH, which initially suggests that the agronomic effectiveness of P fertilizers containing high amounts of these compounds would also increase with soil pH but studies considering activity, instead of concentration, are necessary. With this purpose, both compounds were synthesized under laboratory conditions, characterized by elemental chemical analysis, optical microscopy, X ray diffractometry, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), and used in a solubility study. Solutions of 0.01, 0.05 and 0.1 mol L -1 NaCl with pH adjusted to 3.0, 4.0, 5.0, 5.5, 6.0, 6.5, 7.0 and 7.5 were prepared for the solubility study of H8-syn, H14-syn and a phosphate rock (PR) from Brazil. The orthophosphate activity as H 2 PO 4 -and HPO 4 2-was calculated in each situation as related to pH and ionic strength using software MINTEQ. The remaining precipitates after equilibrium were chemically analyzed and subjected to X ray, SEM and EDS. Results of chemical analysis and instrumental techniques confirmed the preparation method. The activity of orthophosphate ions of both compounds tended to decrease under increasing pH and/or ionic strength of the solution, which in turn suggests that an increase in the solution pH does not necessarily promote an increase in the P bioavailability for plant uptake. This can be important when evaluating agronomic data of P fertilizers with high contents of these two Fe-K-P compounds.Index terms: Phosphate fertilizers, cationic impurities, phosphorus activity, phosphorus bioavailability.(

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Characterization and Agronomic Evaluation of Single Superphosphates Varying in Iron Phosphate Impurities

Cited by 27 publications

References 1 publication

Effectiveness of phosphate fertilizers of diffrent water solubilities in relation to soil phophorus adsorption

Effectiveness of phosphate fertilizers of diffrent water solubilities in relation to soil phophorus adsorption

Fertilización organomineral y NPK en el cultivo maíz (Zea mays L.)

Activity of phosphorus of synthetic Fe-K-P compounds in superphosphate fertilizers as affected by pH and ionic strength

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