|
|
|
| Registros recuperados: 30 | |
|
|
| Mariano,Eduardo; Trivelin,Paulo Cesar Ocheuze; Vieira,Michele Xavier; Leite,José Marcos; Otto,Rafael; Franco,Henrique Coutinho Junqueira. |
| The quantification of ammonia (NH3) losses from sugarcane straw fertilized with urea can be performed with collectors that recover the NH3 in acid-treated absorbers. Thus, the use of an open NH3 collector with a polytetrafluoroethylene (PTFE)-wrapped absorber is an interesting option since its cost is low, handling easy and microclimatic conditions irrelevant. The aim of this study was to evaluate the efficiency of an open collector for quantifying NH3-N volatilized from urea applied over the sugarcane straw. The experiment was carried out in a sugarcane field located near Piracicaba, São Paulo, Brazil. The NH3-N losses were estimated using a semi-open static collector calibrated with 15N (reference method) and an open collector with an absorber wrapped in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp; Nitrogen; N fertilization; Volatilization; Collection system. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200010 |
| |
|
|
| Otto,Rafael; Zavaschi,Eduardo; Souza Netto,Gerson José Marquesi de; Machado,Bianca de Almeida; Mira,Acácio Bezerra de. |
| ABSTRACT Maintenance of crop residues over soil surface under conservational systems limits incorporation of nitrogen fertilizers into the soil. Application of urea over crop residues enhance N-NH3 volatilization losses, justifying the usage of urease inhibitors or N sources less susceptible to volatilization under such conditions. This study aimed to evaluate volatilization losses from N sources applied over sugarcane straw. A field trial was carried out in a sugarcane field in Iracemapolis, Sao Paulo on a Typic Kandiudox in June 2014. We used a complete block experimental design, with seven treatments and four replications. Treatments included Control [CO], ammonium nitrate [AN], NS30TM (ammonium nitrate-75% and ammonium sulfate-25% fused mixture)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urea; NBPT; NS 30 TM; Green cane. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000300413 |
| |
|
|
| Vieira,Michele Xavier; Trivelin,Paulo Cesar Ocheuze; Franco,Henrique Coutinho Junqueira; Otto,Rafael; Faroni,Carlos Eduardo. |
| The great difficulty of incorporation of N fertilizers into the "green sugarcane" system causes concern and since urea is the most commonly used source, there is the risk of loosing NH3 through volatilization. For this reason, a field experiment was undertaken (in a Hapludox Typic) with the objective of evaluating the agronomic efficiency of ammonium chloride on stubble of the second ratoon (SP89 1115), as well as its residual effect on the subsequent cycle (third ratoon). The experimental design was randomized blocks with four replications. Treatments consisted of three N rates (60, 120 and 180 kg ha-1 N) in the form of NH4Cl, in addition to a control treatment without the addition of N fertilizer. The ratoon cane of the second cutting was harvested in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp; Nitrogen fertilization; Ratoon cane. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400016 |
| |
|
|
| Zavaschi,Eduardo; Ferraz-Almeida,Risely; Fária,Letícia Abreu; Otto,Rafael; Vitti,André César; Vitti,Godofredo Cesar. |
| ABSTRACT In tropical soils, the efficiency of phosphorus (P) fertilization is low, due to P adsorption on the surface of the clay. Superphosphate complexed with humic acid (SSP+HA) is presented as an alternative for improving P use efficiency and crop yields. The aim of this study was to investigate SSP+HA performance in sugarcane production including increases in plant dry matter (DM) and P content. The experiment was conducted with two sources of P (simple superphosphate - SSP, SSP+HA) and five doses (0, 45, 90, 135 and 180 kg ha-1 P2O5). The dose of 135 kg ha-1 P2O5 was used to explain the residual effect of P, collecting soil samples from the plant cane and first ratoon. Stalk, top and root samples were collected to determine DM and P content; both... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil fertilization; Phosphorus adsorption; Phosphorus dynamics. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000100408 |
| |
|
|
| Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze; Faroni,Carlos Eduardo; Vitti,André Cesar; Otto,Rafael. |
| O balanço de 15N de fontes nitrogenadas no sistema solo-planta tem sido de muita valia em estudos das transformações do N em diferentes agroecossistemas. No agrossistema da cana-de-açúcar, nas condições brasileiras, a resposta à adubação nitrogenada de cana-planta ainda é questão não totalmente esclarecida e a utilização de fertilizantes nitrogenados marcados com 15N pode auxiliar no entendimento dessa lacuna. Com o objetivo de avaliar o aproveitamento do N da uréia pela cana-de-açúcar no ciclo agrícola de cana-planta, realizaram-se dois experimentos em área comercial de cana-de-açúcar, com o cultivar SP81-3250. Esses experimentos foram feitos de fevereiro de 2005 a julho de 2006. O delineamento experimental foi o de blocos ao acaso, sendo os tratamentos... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Uréia; 15N; Cana-planta. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000700021 |
| |
|
|
| Demattê,José A. M.; Terra,Fabrício da Silva; Otto,Rafael; Toma,Raul Shiso; Pereira,Luiz Henrique; Nascimento,Alexandre Ferreira do; Bortoletto,Marco Antonio Melo. |
| ABSTRACT When the harvesting of sugarcane involves a mechanized process, plant residues remain on the soil surface, which makes proximal and remote sensing difficult to monitor. This study aimed to evaluate, under laboratory conditions, differences in the soil spectral behavior of surface layers Quartzipsamment and Hapludox soil classes due to increasing levels of sugarcane’s dry (DL) and green (GL) leaf cover on the soil. Soil cover was quantified by supervised classification of the digital images (photography) taken of the treatments. The spectral reflectance of the samples was obtained using the FieldSpec Pro (350 to 2500 nm). TM-Landsat bands were simulated and the Normalized Difference Vegetation Index (NDVI) and soil line were also determined. Soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: TM-Landsat; NDVI; Soil remote sensing; Soil proximal sensing; Soil line. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200159 |
| |
|
| |
|
|
| Barth,Gabriel; Otto,Rafael; Almeida,Risely Ferraz; Cardoso,Elke Jurandy Bran Nogueira; Cantarella,Heitor; Vitti,Godofredo Cesar. |
| ABSTRACT The use of nitrification inhibitors (NIs; dicyandiamide - DCD) is an alternative to reduce oxidation of ammonium (NH4+-N) to nitrate (NO3–-N) in the soil, reducing NO3–-N losses from fertilization practices. Based on the hypothesis that DCD reduces conversion of NH4+-N to NO3–-N in tropical soils and inhibits ammonia oxidizing microorganisms (AOM) abundance, soils from the Piracicaba region, São Paulo, with different textures (sand, loam and clay) were incubated with ammonium sulphate (AS) and DCD. Contents of NH4+-N, NO3–-N, soil pH, and AOM abundance were quantified periodically. Ammonium sulphate increased AOM abundance in all soils, but AS+DCD presented AOM abundances similar to the control. During 90 days of incubation, the effectiveness of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: DCD; Nitrogen losses; Ammonium sulphate; Fertilizer. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000401404 |
| |
|
|
| Otto,Rafael; Mariano,Eduardo; Mulvaney,Richard Lesley; Khan,Saeed Ahmad; Boschiero,Beatriz Nastaro; Tenelli,Sarah; Trivelin,Paulo Cezar Ocheuze. |
| ABSTRACT: N Fertilizer recommendations must be improved to optimize N use efficiency (NUE) for bioenergy crops. A study was conducted to test the hypothesis that sites varying in historical usage of by-product differ in soil N-supplying power and sugarcane (Saccharum spp.) responsiveness to N fertilization. Our aim was to quantify soil N availability and N fertilizer rates, sources, and application timings for their effects on sugarcane yield and NUE. Three N response trials, each involving 0 to 200 kg N ha−1, were conducted in the state of São Paulo, Brazil, at sites varying historically in the usage of vinasse. Before fertilizer application and at harvest, soil inorganic N content was quantified and potential N mineralization estimated by the Illinois... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Illinois Soil N Test; Inorganic N; Vinasse; Mineralization. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100072 |
| |
|
|
| Megda,Michele Xavier Vieira; Trivelin,Paulo Cesar Ocheuze; Franco,Henrique Coutinho Junqueira; Otto,Rafael; Vitti,André César. |
| O objetivo deste trabalho foi avaliar a eficiência agronômica das fontes nitrogenadas ureia (U), nitrato de amônio (NA), sulfato de amônio (SA) e cloreto de amônio (CA) em soqueira de cana-de-açúcar colhida sem queima, bem como determinar o efeito residual dessas fontes sobre a produtividade da cultura no ano agrícola subsequente. Utilizou-se o delineamento experimental de blocos ao acaso, com quatro repetições. Os tratamentos consistiram da aplicação de 120 kg ha-1 de N a um Latossolo Vermelho distrófico, coberto por palhada resultante da colheita sem queima da primeira soqueira. Incluiu-se um tratamento de controle sem adição de N fertilizante. Para avaliar o efeito residual dos adubos nitrogenados, aplicaram-se 450 kg ha-1 do formulado 20-5-19 após o... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum; Cloreto de amônio; Efeito residual; Nitrogênio. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012001200002 |
| |
|
|
| Faroni,Carlos Eduardo; Trivelin,Paulo Cesar Ocheuze; Franco,Henrique Coutinho Junqueira; Vitti,André Cesar; Otto,Rafael; Cantarella,Heitor. |
| Estudos com isótopos estáveis são cada vez mais comuns pela qualidade e confiabilidade dos resultados obtidos e por não apresentarem risco ao homem e ao ambiente. No entanto, é necessário o uso de microparcelas para diminuir o custo do projeto. Por suas áreas serem muito reduzidas em relação à parcela onde está inserida, o objetivo deste trabalho foi comparar o estado nutricional de plantas das microparcelas com as do restante das parcelas experimentais, na fase de máximo desenvolvimento da cultura da cana-de-açúcar, em experimentos com doses de N. Foram instalados três experimentos, no Estado de São Paulo, com três doses de N e uma testemunha, com quatro repetições, em delineamento em blocos completos casualizados. Nas parcelas, de 48 linhas de 15 m cada,... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Diagnose foliar; Microparcela; Adubação nitrogenada; Macronutrientes. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600041 |
| |
|
|
| Otto,Rafael; Franco,Henrique Coutinho Junqueira; Faroni,Carlos Eduardo; Vitti,André César; Trivelin,Paulo Cesar Ocheuze. |
| O objetivo deste trabalho foi avaliar o desenvolvimento de raízes e da parte aérea da cana-de-açúcar (Saccharum spp.), no ciclo cana-planta, em resposta à aplicação de nitrogênio (N) no sulco de plantio. Dois experimentos, um em Latossolo Vermelho-Amarelo eutrófico e outro em Latossolo Vermelho distrófico, foram realizados em delineamento de blocos ao acaso, com quatro repetições, com um tratamento sem N (controle) e os tratamentos com 40, 80 e 120 kg ha-1 de N na forma de ureia, aplicados no sulco de plantio. A massa de raízes e da parte aérea foi quantificada em três épocas (outubro de 2005, fevereiro de 2006 e em junho/julho de 2006). A parte aérea foi coletada em 2 m da linha, e as raízes foram coletadas com uma sonda de 0,055 m de diâmetro interno,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Cana-planta; Nitrogênio. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000400010 |
| |
|
|
| Trivelin,Paulo Cesar Ocheuze; Franco,Henrique Coutinho Junqueira; Otto,Rafael; Ferreira,Danilo A.; Vitti,André Cesar; Fortes,Caio; Faroni,Carlos E.; Oliveira,Emidio C. A.; Cantarella,Heitor. |
| The area under mechanized sugarcane (Saccharum spp.) harvesting is expanding in Brazil, increasing the return of trash to the soil. The main questions regarding this management are: (i) after adopting unburned mechanical harvesting, how long will it take to observe decreases in fertilizer requirements, (ii) what will be the magnitude of this decrease and, (iii) the impact in the short run of removing trash for energy purposes in the nutrient cycling? This study aimed to build an N prediction model for long term assessment of the contribution of sugarcane crop residues to sugarcane nutrition and to evaluate the cycling of other nutrients derived from crop residues. Keeping crop residues over the soil will increase soil N stock and N recovery by sugarcane,... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500009 |
| |
|
|
| Mariano,Eduardo; Trivelin,Paulo Cesar Ocheuze; Leite,José Marcos; Megda,Michele Xavier Vieira; Otto,Rafael; Franco,Henrique Coutinho Junqueira. |
| Considering nitrogen mineralization (N) of soil organic matter is a key aspect for the efficient management of N fertilizers in agricultural systems. Long-term aerobic incubation is the standard technique for calibrating the chemical extraction methods used to estimate the potentially mineralizable N in soil. However, the technique is laborious, expensive and time-consuming. In this context, the aims of this study were to determine the amount of soil mineralizable N in the 0-60 cm layer and to evaluate the use of short-term anaerobic incubation instead of long-term aerobic incubation for the estimation of net N mineralization rates in soils under sugarcane. Five soils from areas without previous N fertilization were used in the layers 0-20, 20-40 and 40-60... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Net N mineralization; Aerobic incubation; Anaerobic incubation. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200016 |
| |
|
|
| Carvalho,João Luís Nunes; Otto,Rafael; Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze. |
| Sugarcane (Saccharum spp.) crops provide carbon (C) for soil through straw and root system decomposition. Recently, however, sugarcane producers are considering straw to be removed for electricity or second generation ethanol production. To elucidate the role of straw and root system on the carbon supply into the soil, the biomass inputs from sugarcane straw (tops and dry leaves) and from root system (rhizomes and roots) were quantified, and its contribution to provide C to the soil was estimated. Three trials were carried out in the State of Sao Paulo, Brazil, from 2006 to 2009. All sites were cultivated with the variety SP81 3250 under the green sugarcane harvest. Yearly, post-harvest sugarcane residues (tops, dry leaves, roots and rhizomes) were... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500008 |
| |
|
| |
|
|
| Vitti,André Cesar; Trivelin,Paulo Cesar Ocheuze; Cantarella,Heitor; Franco,Henrique Coutinho Junqueira; Faroni,Carlos Eduardo; Otto,Rafael; Trivelin,Matheus Olivetti; Tovajar,João Gabriel. |
| O experimento foi realizado em canavial comercial, com a variedade SP81 3250, na Usina São Martinho (Pradópolis-SP), em Latossolo Vermelho-Escuro de textura argilosa, com o objetivo de avaliar a mineralização da palha de cana-de-açúcar e sua composição após um ciclo de desenvolvimento da cultura. Foi utilizado um delineamento experimental de blocos completos casualizados, com quatro repetições. Sacos de telas que continham palha marcada em 15N (1,07 % de átomos de 15N), em quantidades equivalentes a 9 t ha-1 de matéria seca, foram colocados entre as fileiras de cana-planta, em todos os tratamentos (0, 40, 80 e 120 kg ha-1 de N). Após 14 meses (de junho 2005 a agosto 2006), foram retirados os sacos para a quantificação do material seco remanescente e para... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Nitrogênio; Técnica isotópica. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000700020 |
| |
|
|
| Almeida,Rodrigo Estevam Munhoz de; Favarin,José Laércio; Otto,Rafael; Franco,Henrique; Reis,André Froes Borja; Moreira,Lílian Angélica; Trivelin,Paulo. |
| ABSTRACT Intercropping corn and palisade grass is a technique to increase straw production, soil C contents, nutrient cycling and crop yield. However, concerns arise from nitrogen (N) uptake by the intercropping crop causing reduction in the yield of the corn. Our objective was to evaluate N recovery efficiency (NRE), and the N dynamics in the soil-plant system in corn intercropped with palisade grass. A field trial was carried out in Bahia, Brazil, evaluating two cropping systems: corn (monoculture) and corn intercropped with palisade grass sowed between rows on the same day as the corn crop, with four replicates in a completely randomized block design. Nitrogen (150 kg∙ha–1of 15N-urea) was applied at sowing to determine NRE, which means the amounts of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urochloa ruziziensis; Urea; 15N isotope technique; No-till system; Brazilian Cerrado. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000400557 |
| |
|
|
| Vitti,André Cesar; Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze; Ferreira,Danilo Alves; Otto,Rafael; Fortes,Caio; Faroni,Carlos Eduardo. |
| O objetivo deste trabalho foi avaliar a recuperação, pela cana-planta, do nitrogênio (15N) proveniente da ureia e de resíduos culturais da palhada e do sistema radicular da cultura da cana (Saccharum spp.) incorporados ao solo. O experimento foi instalado na safra de 2005/2006, com a cultivar SP81-3250. No plantio, foram instaladas microparcelas de 1,5x2 m, em que aplicaram-se doses equivalentes a 80 kg ha-1 de N (ureia com 5,05% de 15N) e 14 Mg ha-1 de resíduos culturais, dos quais 9 Mg ha-1 de palhada (PA) e 5 Mg ha-1 de sistema radicular (SR), marcados com 15N (1,07 e 0,81% de 15N, respectivamente). Durante o ciclo da cultura, determinou-se o acúmulo total de N da planta. Embora o aproveitamento do N oriundo da mineralização dos resíduos culturais (PA e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum; Cana-de-açúcar; 15N; Raízes; Ureia. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000300009 |
| |
|
|
| Vieira,José Luís Vilela; Nardi,Kaue Tonelli; Silva,Gabriel Rodrigues Anastácio; Moreira,Lílian Angélica; Zavaschi,Eduardo; Moura,Thiago Augusto; Otto,Rafael. |
| ABSTRACT: Determining nutrient uptake and accumulation rates by cotton crops is important to define management strategies, especially for transgenic varieties, which are cultivated using high-technology approaches that require substantial investment to maximize yield. Currently in Brazil, the states of Bahia and Mato Grosso are responsible for 84.4 % of the total cotton growing area. In the present study, two trials were conducted in 2013, one that involved planting FM 940 GLT, FM 980 GLT, and FM 913 GLT varieties in the state of Bahia and the other which involved FM 940 GLT and FM 980 GLT varieties in the state of Mato Grosso. The aim of the two trials was to represent the two regions that currently encompass the largest areas of cotton cultivation.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum; Nutrient accumulation; Cotton nutrition; Uptake rate. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100506 |
| |
| Registros recuperados: 30 | |
|
|
|
