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Article ; Online: Additives incorporated into urea to reduce nitrogen losses after application to the soil

Ioná Rech / José Carlos Polidoro / Paulo Sérgio Pavinato

Pesquisa Agropecuária Brasileira, Vol 52, Iss 3, Pp 194-

2017 Volume 204

Abstract: Abstract: The objective of this work was to develop urea-based fertilizers with internal incorporation of urease inhibitors and other additives in the granule. The effects of the incorporation of NBPT, copper (Cu+2), boric acid (H3BO3), elemental sulphur ...

Abstract	Abstract: The objective of this work was to develop urea-based fertilizers with internal incorporation of urease inhibitors and other additives in the granule. The effects of the incorporation of NBPT, copper (Cu+2), boric acid (H3BO3), elemental sulphur (Sº), and a clay mineral from the zeolite group in powder urea - with ten different combinations of these additives - were evaluated as to N losses by volatilization and leaching. The losses in laboratory-developed formulations were compared with those of commercial fertilizers coated with the same additives (Super N, FH Nitro Mais, and FH Nitro Gold). The evaluations were made in greenhouse conditions, using a Ultisol accommodated in PVC columns. Nitrate and ammonium leaching was evaluated in the solution percolated through the soil columns. Ammonia volatilization was measured with a semi-open static chamber. The incorporation of urease inhibitors (NBPT, H3BO3, and Cu+2) into the urea granules was efficient to reduce N volatilization. Ammonia volatilization in the laboratory-developed ureas was lower than in commercial fertilizers coated with the same additives, while ammonium sulfate losses by leaching were similar. The addition of zeolite does not reduce N volatilization. Mineral N leaching in the soil profile is not affected by urease inhibitors.
Keywords	ammonia volatilization ; leaching ; NBPT ; nitrogen fertilizers ; urease inhibitors ; Agriculture (General) ; S1-972
Subject code	630
Language	English
Publishing date	2017-03-01T00:00:00Z
Publisher	Embrapa Informação Tecnológica
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Ammonia volatilization and agronomical efficiency of a mixture of urea with natural zeolite for rose fertilization

Carlos Guarino Werneck / Patrick Gesualdi Haim / Farley Alexandre da Fonseca Breda / Marisa Bezerra de Mello Monte / Alberto Carlos de Campos Bernardi / Nelson Mazur / José Carlos Polidoro

Pesquisa Agropecuária Brasileira, Vol

2022 Volume 56

Abstract: Abstract The objective of this work was to evaluate the losses of N-NH3 by volatilization and the agronomic efficiency of a mixture of urea with natural zeolite, as topdressing fertilization, in an area for the commercial production of roses (Rosa spp.). ...

Abstract	Abstract The objective of this work was to evaluate the losses of N-NH3 by volatilization and the agronomic efficiency of a mixture of urea with natural zeolite, as topdressing fertilization, in an area for the commercial production of roses (Rosa spp.). The treatments were: two rates of urea (60 and 120 kg ha-1), with and without zeolite. The N sources were applied directly to soil surface, and volatilization was determined using a free semi-open static chamber. The quantitative and qualitative variables of the collected flower stems were used to determine the agronomical efficiency of the fertilizers. The zeolite mixture reduces N-NH3 losses in 30%, compared with the commercial urea fertilizer, and shows a higher agronomic efficiency, resulting in an increase of 25 dozen of flower stems per each kilogram of N applied.
Keywords	Rosa ; aluminosilicates ; ammonium trapping ; slow release ; stilbite ; Agriculture (General) ; S1-972
Language	English
Publishing date	2022-02-01T00:00:00Z
Publisher	Embrapa Informação Tecnológica
Document type	Article ; Online
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Article ; Online: Characterization of Cuban and Brazilian natural zeolites by photoacoustic spectroscopy and electron paramagnetic resonance

ARLEM LARA-BERNAL / MARCELO G. DA SILVA / LEONARDO MOTA / ERNESTO MARÍN / THALLIS C. CORDEIRO / EDSON C. DA SILVA / DANIEL A. VIANA / HELION VARGAS / JOSÉ CARLOS POLIDORO / MARISA BEZERRA DE MELLO-MONTE

Anais da Academia Brasileira de Ciências, Vol 94, Iss

2022 Volume 1

Abstract: Abstract This report describes the photoacoustic and electron paramagnetic resonance investigations of Brazilian and Cuban zeolites. Photoacoustic optical absorption measurements indicate the presence of iron (Fe 3 +) ions with their respective ... ...

Abstract	Abstract This report describes the photoacoustic and electron paramagnetic resonance investigations of Brazilian and Cuban zeolites. Photoacoustic optical absorption measurements indicate the presence of iron (Fe 3 +) ions with their respective transition bands for both zeolites. Two species of manganese (Mn 2 + and Mn 3 +) were identified in the Cuban sample and the electronic transitions assigned. Iron and manganese ions were confirmed through nonradiative relaxation ( τ) and characteristic diffusion ( τ β) times evaluation, whose values were found to be τ BRA = 5.40 ms, τ CUB = 4.60 ms, τ β BRA = 387 μs and τ β CUB = 305 μs. Crystal field (Dq- BRA/Dq- CUB = 1048 cm − 1/945 cm − 1) plus Racah (B- BRA/B- CUB = 457 cm − 1/813 cm − 1 and C- BRA/C- CUB = 3655 cm − 1/2496 cm − 1) parameters were assessed as well. Paramagnetic resonance corroborated Fe 3 + ions present in the Brazilian zeolite occupying sites showing axial and/or rhombic symmetry distortions. For the Cuban sample, results reveal the characteristic hyperfine sextet lines of Mn 2 + overlapping the Fe 3 + line. Values of Landé factor and isotropic hyperfine splitting constant were found to be 2.0 and 9.7 mT, respectively. This tells us that the Mn 2 + lies in octahedral symmetry probably replacing calcium ions and point towards an ionic bonding character of the Mn 2 + and its surroundings.
Keywords	Characteristic diffusion time ; natural zeolites ; nonradiative relaxation time ; phase resolved method ; Racah parameters ; Science ; Q
Subject code	541
Language	English
Publishing date	2022-01-01T00:00:00Z
Publisher	Academia Brasileira de Ciências
Document type	Article ; Online
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Article ; Online: MODELAGEM DO CRESCIMENTO E PRODUTIVIDADE DO ALGODÃO EM CULTIVO COMERCIAL NO CERRADO BAIANO

Eduardo Pires Bender / Josimar Nogueira Batista / Guilherme Bastos Lyra / Jose Carlos Polidoro / Claudia Pozzi Jantalia / Gustavo Bastos Lyra

Nativa, Vol 8, Iss

2020 Volume 3

Abstract: A análise de crescimento e produção dos cultivos é fundamental para avaliar a interação das culturas com o ambiente e práticas agrícolas. Neste estudo, avaliações sobre o crescimento e produtividade do algodoeiro foram conduzidas em um sistema comercial ... ...

Abstract	A análise de crescimento e produção dos cultivos é fundamental para avaliar a interação das culturas com o ambiente e práticas agrícolas. Neste estudo, avaliações sobre o crescimento e produtividade do algodoeiro foram conduzidas em um sistema comercial de produção sob regime de sequeiro, submetido a duas diferentes fontes de nitrogênio no município de Luís Eduardo Magalhães, Bahia. O objetivo foi avaliar o ajuste dos modelos logístico e exponencial, respectivamente, às variáveis de crescimento do algodão e o índice de área foliar (IAF), em função dos graus-dia acumulado (GDA). Para isso, foram realizadas observações na safra 2014/15 dos seguintes parâmetros biométricos: altura da planta, biomassa total, biomassa de caule, folhas e estruturas reprodutivas. Os modelos logísticos e exponenciais ajustados em função dos GDA mostraram-se capazes de representar satisfatoriamente a variação dos parâmetros biométricos avaliados, com coeficiente de regressão ajustado (R2ajs) entre 0,88 e 0,99. A produtividade média de algodão em caroço oscilou entre 5263,4 e 3891,5 kg ha-1 e o rendimento de pluma entre 2300,1 e 1688,9 kg ha-1. Conclui-se que os modelos ajustados podem ser utilizados para auxiliar na análise de crescimento vegetal, quando relacionados aos GDA, além de permitirem obter coeficientes biométricos utilizados em modelos dinâmicos. Palavras-chave: solos tropicais; partição de biomassa; modelos de crescimento. MODELING OF COTTON GROWTH AND YIELD IN COMMERCIAL AREA IN BAHIA CERRADO ABSTRACT: Growth analysis and yield of crops are key to evaluate the interaction of crops with the environment and agricultural practices. In this study, assessments of cotton growth and yield were carried out in a commercial production system in rainfed regime, submitted to two different sources of nitrogen in in the municipality of Luís Eduardo Magalhães, State of Bahia, Brazil. The aim was to assess the fit of logistic and exponential models, the growth variables cotton and the leaf area index, due to cumulative degree-days (CDD). ...
Keywords	Agriculture ; S ; Environmental sciences ; GE1-350
Language	English
Publishing date	2020-05-01T00:00:00Z
Publisher	Universidade Federal de Mato Grosso (UFMT)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Solo, da origem da vida ao alicerce das civilizações

Daniel Vidal Pérez / Maria de Lourdes Mendonça Brefin / José Carlos Polidoro

Pesquisa Agropecuária Brasileira, Vol 51, Iss 9, Pp i-iv (2016)

uso, manejo e gestão

2016

Keywords	Agriculture (General) ; S1-972
Language	English
Publishing date	2016-09-01T00:00:00Z
Publisher	Embrapa Informação Tecnológica
Document type	Article ; Online
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Article ; Online: Agronomic and P recovery efficiency of organomineral phosphate fertilizer from poultry litter in sandy and clayey soils

Jerusa Maia e Sá / Cláudia Pozzi Jantalia / Paulo César Teixeira / José Carlos Polidoro / Vinícius de Melo Benites / Adelson Paulo Araújo

Pesquisa Agropecuária Brasileira, Vol 52, Iss 9, Pp 786-

2017 Volume 793

Abstract: Abstract: The objective of this work was to evaluate agronomic and P recovery efficiencies of a granulated organomineral phosphate fertilizer (OMF) produced from poultry litter, compared with those of monoammonium phosphate (MAP), in soils with different ...

Abstract	Abstract: The objective of this work was to evaluate agronomic and P recovery efficiencies of a granulated organomineral phosphate fertilizer (OMF) produced from poultry litter, compared with those of monoammonium phosphate (MAP), in soils with different textures. The experiment followed a 2x2x4+2 factorial arrangement, with two Oxisols (sandy loam and clay loam textures), two sources of P (OMF and MAP), four levels of P (50, 100, 200, and 400 mg kg-1), besides two control treatments without P application. The treatments were evaluated in 10-kg pots filled with soil, during four successive cultivations of corn without replacing the P absorbed by the plants, in order to evaluate the actual and residual effects of the fertilizers. Available P contents in the soil were higher with the MAP fertilizer in the sandy loam soil, with no significant differences between fertilizers in the clay loam soil. OMF had a greater immediate effect and promoted a higher dry matter yield in the first cultivation; however, the residual effects of the fertilizers did not differ in the other cultivations. P accumulation by plants was not affected by the fertilizer used. OMF had higher agronomic efficiency, but P recovery efficiency did not differ significantly between fertilizers. OMF performance indicates good potential use of poultry litter as fertilizer, in organomineral formulations.
Keywords	Zea mays ; biomass accumulation ; phosphate fertilization ; P recovery efficiency ; tropical soils ; Agriculture (General) ; S1-972
Subject code	630
Language	English
Publishing date	2017-09-01T00:00:00Z
Publisher	Embrapa Informação Tecnológica
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Impact of plant growth-promoting bacteria on grain yield, protein content, and urea-15 N recovery by maize in a Cerrado Oxisol

Martins, MarcioReis / Claudia Pozzi Jantalia / Verônica Massena Reis / Ingbert Döwich / José Carlos Polidoro / Bruno José Rodrigues Alves / Robert Michael Boddey / Segundo Urquiaga

Plant and soil. 2018 Jan., v. 422, no. 1-2

2018

Abstract: BACKGROUND AND AIMS: The inoculation of cereal crops with plant growth-promoting bacteria (PGPB) is a potential strategy to improve fertilizer-N acquisition by crops in soils with low capacity to supply N. A study was conducted to assess the impact of ... ...

Abstract	BACKGROUND AND AIMS: The inoculation of cereal crops with plant growth-promoting bacteria (PGPB) is a potential strategy to improve fertilizer-N acquisition by crops in soils with low capacity to supply N. A study was conducted to assess the impact of three inoculants on grain yield, protein content, and urea-¹⁵ N recovery in maize (Zea mays L.) under Cerrado soil and climate conditions. METHODS: The main treatments included inoculants containing (i) Azospirillum brasilense strain Sp245, (ii) A. brasilense strains AbV5 + AbV6, (iii) Herbaspirillum seropedicae strain ZAE94, and (iv) a non-inoculated control. The subtreatments were (i) urea-N fertilization (100 kg N ha⁻¹) at 30 days after sowing and (ii) no N addition at the stage. To determine fertilizer-N recovery, ¹⁵N–labelled urea was applied in microplots. RESULTS: Inoculants carrying A. brasilense improved urea-¹⁵ N acquisition efficiency in maize and also improved grain yield compared to the non-inoculated control, while urea-N fertilization enhanced grain quality by providing higher protein content. CONCLUSION: Our results suggest that the inoculation of maize grains with PGPB represents a strategy to improve fertilizer-N recovery and maize yield in Cerrado soil with a low capacity to supply N.
Keywords	Azospirillum brasilense ; Herbaspirillum seropedicae ; Oxisols ; Zea mays ; cerrado ; cerrado soils ; climate ; corn ; grain crops ; grain quality ; grain yield ; plant growth-promoting rhizobacteria ; protein content ; sowing ; stable isotopes ; urea ; urea nitrogen
Language	English
Dates of publication	2018-01
Size	p. 239-250.
Publishing place	Springer International Publishing
Document type	Article
ZDB-ID	208908-7
ISSN	1573-5036 ; 0032-079X
ISSN (online)	1573-5036
ISSN	0032-079X
DOI	10.1007/s11104-017-3193-1
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Volatilização de amônia proveniente de fertilizantes minerais mistos contendo ureia

Gabriela Cemirames de Sousa Gurgel / Anderson Claiton Ferrari / Ademir Fontana / José Carlos Polidoro / Leonardo de Andrade Martins Coelho / Everaldo Zonta

Pesquisa Agropecuária Brasileira, Vol 51, Iss 9, Pp 1686-

2016 Volume 1694

Abstract: Resumo O objetivo deste trabalho foi selecionar um método para estimar o N-NH3 perdido por volatilização e determinar essas perdas em fertilizantes mistos contendo ureia. Um experimento foi realizado em casa de vegetação, em bandejas preenchidas com solo ...

Abstract	Resumo O objetivo deste trabalho foi selecionar um método para estimar o N-NH3 perdido por volatilização e determinar essas perdas em fertilizantes mistos contendo ureia. Um experimento foi realizado em casa de vegetação, em bandejas preenchidas com solo arenoso, com as doses de ureia de 0, 50, 100 e 200 kg ha-1 de N. A amônia volatilizada foi quantificada por três métodos: CSA, coletor semiaberto; Sale, coletor semiaberto livre estático; e CA, coletor aberto. Em um segundo experimento, avaliou-se a volatilização de amônia proveniente de 18 fertilizantes mistos com ureia, ácidos húmicos e zeólita, em solos com textura arenosa e argilosa, na dose de 200 kg ha-1 de N. O CSA foi o método que recuperou mais N, seguido do Sale e do CA. O Sale é mais adequado para experimentos com elevado número de unidades amostrais, por ser mais prático. Os fertilizantes minerais mistos com ureia e ácido húmico (5 e 10%) e com ureia e zeólita (10%) apresentaram os melhores resultados na mitigação da volatilização da amônia, com redução nas perdas de N-NH3 de até 38%. Os tratamentos são mais efetivos no combate à volatilização no solo de textura arenosa.
Keywords	ácidos húmicos ; coletores semiabertos ; fertilizantes nitrogenados ; fertilizantes organominerais ; perdas de N ; zeólita ; Agriculture (General) ; S1-972
Language	English
Publishing date	2016-09-01T00:00:00Z
Publisher	Embrapa Informação Tecnológica
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Litter decomposition and nutrient release from Brachiaria, Sorghum and soybean in no-tillage areas in the Cerrado region, Goiás Decomposição e liberação de nutrientes da palhada de braquiária, sorgo e soja em áreas de plantio direto no cerrado goiano

Celeste Queiroz Rossi / Marcos Gervasio Pereira / Simone Guimarães Giácomo / Marconi Betta / José Carlos Polidoro

Semina: Ciências Agrárias, Vol 34, Iss 4, Pp 1523-

2013 Volume 1534

Abstract: The evaluation of plant litter decomposition added to the soil by cover crops provides a better understanding of nutrient supply to crops of commercial interest. The objective of this study was to evaluate the decomposition rate and dynamics of release ... ...

Abstract	The evaluation of plant litter decomposition added to the soil by cover crops provides a better understanding of nutrient supply to crops of commercial interest. The objective of this study was to evaluate the decomposition rate and dynamics of release of N, P and K in crop residues from crop of soybeans grown in Oxisol under no tillage. The residues used were Congo grass (Brachiaria ruziziensis) and sorghum (Sorghum bicolor L. Moench). The average production of Congo grass biomass + soybean was 6.1 Mg ha-1 and soybean + sorghum was 3.8 Mg ha-1. The dry matter decomposition and nutrient release were monitored at 15, 30, 60, 90, 120 days using bags containing residues deposited on the soil surface. A mathematical model was used to describe the litter decomposition and N, P, K release and the decomposition constant (k) and half-life (T1/2) were calculated. The values of T1/2 for dry matter were 154 and 258 days for Brachiaria + soybean and soybean + sorghum, respectively, in the dry season and 99 and 119 days in the rainy season. The nutrient with the lowest T1/2 was P, followed by K and N in both litters and evaluated at different times. A avaliação da decomposição dos resíduos vegetais adicionados ao solo pelas plantas de cobertura permite uma melhor compreensão do fornecimento de nutrientes para as culturas de interesse comercial. O objetivo do trabalho foi avaliar as taxas de decomposição e a dinâmica da liberação de N, P e K de resíduos culturais na entressafra da soja cultivada em Latossolo Vermelho, sob plantio direto. Os resíduos utilizados foram braquiária (Brachiaria ruziziensis R. Germ. & Evrard) e o sorgo (Sorghum bicolor L. Moench). A produção média de biomassa seca de braquiária + soja foi de 6,1 Mg ha-1 e do sorgo + soja foi de 3,8 Mg ha-1 . A decomposição da matéria seca e a liberação de nutrientes foram monitoradas aos 15, 30, 60, 90, 120 dias por meio de sacolas contendo resíduos culturais depositados na superfície do solo. Utilizou-se um modelo matemático exponencial negativo simples para ...
Keywords	Resíduos culturais ; Cerrado ; Tempo de meia vida ; Agriculture (General) ; S1-972
Language	English
Publishing date	2013-09-01T00:00:00Z
Publisher	Universidade Estadual de Londrina
Document type	Article ; Online
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Article ; Online: Frações lábeis da matéria orgânica em sistema de cultivo com palha de braquiária e sorgo Labile fractions of organic matter in cropping system with straw of brachiaria and sorghum

Celeste Queiroz Rossi / Marcos Gervasio Pereira / Simone Guimarães Giácomo / Marconi Betta / José Carlos Polidoro

Revista Ciência Agronômica, Vol 43, Iss 1, Pp 38-

2012 Volume 46

Abstract: O papel fundamental da matéria orgânica nas características físicas, químicas e biológicas do solo, justifica o crescente interesse pela identificação de sistemas de uso e de manejo que contribuam para o aumento do estoque de carbono em solos tropicais. ... ...

Abstract	O papel fundamental da matéria orgânica nas características físicas, químicas e biológicas do solo, justifica o crescente interesse pela identificação de sistemas de uso e de manejo que contribuam para o aumento do estoque de carbono em solos tropicais. O objetivo desse trabalho foi avaliar o estoque de carbono (EstC) na fração particulada (>53 µm) da matéria orgânica do solo e na fração associada aos minerais (<53 µm). Amostras de um Latossolo Vermelho Distrófico foram coletadas em cinco profundidades no município de Montividiu - GO, nos seguintes sistemas agrícolas: a) cultivo de braquiária (Brachiaria ruziziensi) na entressafra de soja (Glycine max) (SB), b) cultivo de sorgo (Sorghum bicolor L. Moench) na entressafra da soja (SS) e como área de referência, Cerrado. Foram analisados os teores de carbono orgânico total (COT) e o fracionamento granulométrico da matéria orgânica do solo. A partir dos valores encontrados foram quantificados os estoques de carbono em cada uma das frações. Foram verificadas diferenças significativas para os teores de COT em todas as profundidades avaliadas. Os maiores valores de EstC foram encontrados em SB, em todas as profundidades de amostragem. A fração particulada da matéria orgânica (MOP) mostrou-se um parâmetro eficaz em demonstrar diferenças de manejo entre os sistemas, apresentando maiores teores no sistema SB devido ao maior aporte de biomassa nesse sistema, já para a fração ligada aos minerais os maiores teores foram verificados na área de referência, seguida pelo sistema SS. The key role of organic matter (OM) in the physical, chemical and biological soil features justifies the growing interest in identifying use and management systems which contribute to increase the stock of carbon (StC) in tropical soils. The aim of this study was to evaluate the stock of carbon in the particulate (>53 µm) and mineral-associated soil organic matter fractions (<53 mm). Soil samples from a Rhodic Udox collected in Montividiu, Goiás State (Brazil), were taken at five depths in the following agricultural systems: a) brachiaria cultivated in the soybean fallow period (SB), b) sorghum cultivated in the soybean fallow period (SS) and Cerrado as reference area. The levels of total organic carbon (TOC), granulometric fractioning of soil organic matter and the stock of carbon in each of the fractions were quantified. There were significant differences in the TOC levels at all depths. The highest values were found in the StC of SB system, at all depths. The fraction of particulate organic matter (POM) was an effective parameter to demonstrate differences between management systems, achieving the highest levels in the SB system due to the higher biomass input in this system, however for the mineral-associated fraction, the highest levels were recorded in the reference area, followed by the SS system.
Keywords	Capim braquiária ; Sorgo ; Palha-utilização na agricultura ; Brachiaria grass ; Sorghum ; Straw-use in agriculture ; Agriculture (General) ; S1-972
Language	English
Publishing date	2012-03-01T00:00:00Z
Publisher	Universidade Federal do Ceará
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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