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| Zavaschi,Eduardo; Faria,Letícia de Abreu; Vitti,Godofredo Cesar; Nascimento,Carlos Antonio da Costa; Moura,Thiago Augusto de; Vale,Diego Wyllyam do; Mendes,Fernanda Latanze; Kamogawa,Marcos Yassuo. |
| A form of increasing the efficiency of N fertilizer is by coating urea with polymers to reduce ammonia volatilization. The aim of this study was to evaluate the effect of polymer-coated urea on the control of ammonia volatilization, yield and nutritional characteristics of maize. The experiment was carried out during one maize growing cycle in 2009/10 on a Geric Ferralsol, inUberlândia, MG, Brazil. Nitrogen fertilizers were applied as topdressing on the soil surface in the following urea treatments: polymer-coated urea at rates of 45, 67.5 and 90 kg ha-1 N and one control treatment (no N), in randomized blocks with four replications. Nitrogen application had a favorable effect on N concentrations in leaves and grains, Soil Plant Analysis Development (SPAD)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen; Polymer-coated urea; N fertilizer; Ammonia volatilization; Zea mays; SPAD reading. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400016 |
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| 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 |
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| 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 |
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| Bertol,Ildegardis; Zoldan Junior,Wilson Antonio; Fabian,Evandro Luiz; Zavaschi,Eduardo; Pegoraro,Rafael; González,Antonio Paz. |
| O preparo do solo altera as suas condições físicas de superfície e subsuperfície e, conseqüentemente, influencia os valores de propriedades que se relacionam com a erosão hídrica. O trabalho, realizado entre junho de 2005 e março de 2006 em um Nitossolo Háplico alumínico típico, objetivou estudar o efeito de uma escarificação e da erosividade de chuvas sobre algumas variáveis relacionadas à erosão hídrica do solo nos sistemas de manejo: (a) preparo convencional sem cultivo do solo (SCE); (b) preparo convencional (PCE); (c) semeadura direta em solo nunca preparado e com resíduos queimados (SQE); e (d) semeadura direta tradicional (STE). Nos tratamentos PCE, SQE e STE, cultivaram-se aveia-preta, soja, ervilhaca-comum, milho, feijão preto, nabo forrageiro, em... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chuva simulada; Rugosidade; Enxurrada; Perda de solo. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000200029 |
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| Bertol,Ildegardis; Barbosa,Fabricio T.; Fabian,Evandro L.; Pegoraro,Rafael; Zavaschi,Eduardo; González,Antonio P.; Vázquez,Eva V.. |
| O preparo mecânico do solo influencia o seu manejo e danifica a estrutura, diminui a porosidade e a infiltração de água e aumenta o escoamento superficial. Utilizando-se simulador de chuvas, estudaram-se os tratamentos, preparo convencional (PC); semeadura direta em resíduo queimado (SQ); semeadura direta em resíduo dessecado (SD); e semeadura direta tradicional em resíduo dessecado (ST), cultivados, além de um preparo convencional sem cultivo do solo (SC - testemunha) e de um campo nativo (CN), em um Nitossolo Háplico no Planalto Sul Catarinense, entre março de 2001 e fevereiro de 2004, com o objetivo de quantificar o escoamento superficial. Ao milho e feijão se aplicaram três testes de chuva em cada um e à soja cinco testes. Quantificaram-se os tempos de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Taxa de equilíbrio de enxurrada; Volume de enxurrada; Coeficiente C da Equação Racional. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662008000300004 |
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| 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 |
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| Faria,Italo Kaye Pinho de; Vieira,José Luís Vilela; Tenelli,Sarah; Almeida,Rodrigo Estevam Munhoz de; Campos,Leonardo José Motta; Costa,Rodrigo Veras da; Zavaschi,Eduardo; Almeida,Risely Ferraz de; Carneiro,Leandro de Mello e Silva; Otto,Rafael. |
| ABSTRACT: Integrating plant density and nitrogen (N) management is a strategy for improving corn yields, especially for off-season corn production in the tropics. This study tested the hypothesis that increasing plant densities and N rates promotes yield gains for off-season corn production in high-yielding environments. The aim of the study was to investigate the yield performances of two hybrid versions (DKB PRO and DKB PRO3) submitted to three plant densities (55,000; 65,000 and 75,000 plants ha−1) and four N rates (control, 60, 120 and 180 kg ha−1 N). Field trials were undertaken at Uberlândia-MG (site1 and 2) and Pedro Afonso-TO (site 3), Brazil from which data on corn yield parameters were collected and analyzed. Multivariate analysis separated the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Hybrid; Population; Corn yield; Second-crop. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400344 |
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| Zoldan Junior,Wilson Antonio; Bertol,Ildegardis; Pegoraro,Rafael; Fabian,Evandro Luiz; Zavaschi,Eduardo; Vázquez,Eva Vidal. |
| A rugosidade superficial do solo é influenciada, entre outros fatores, pelo efeito residual de manejo do solo, pelo tipo de preparo e pela erosividade da chuva e, juntamente com a cobertura do solo por resíduos vegetais, influencia a erosão hídrica. O objetivo deste trabalho foi determinar, entre junho de 2005 e março de 2006, em um Nitossolo Háplico alumínico típico, o efeito de uma operação de escarificador e da erosividade de chuvas sobre a rugosidade superficial, nos seguintes sistemas de manejo do solo: preparo convencional sem cultivo do solo (SCE), preparo convencional com cultivo do solo (PCE), semeadura direta em solo nunca preparado e com resíduos queimados (SQE) e semeadura direta tradicional (STE). Nos tratamentos PCE, SQE e STE, cultivaram-se... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microrrelevo superficial; Decaimento da rugosidade; Chuva simulada. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000100033 |
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| Altarugio,Lucas Miguel; Loman,Marcos Harm; Nirschl,Matheus Gomes; Silvano,Rafael Gil; Zavaschi,Eduardo; Carneiro,Leandro de Mello e Silva; Vitti,Godofredo Cesar; Luz,Pedro Henrique de Cerqueira; Otto,Rafael. |
| Abstract: The objective of this work was to evaluate the effect of magnesium foliar spray on yield performance of soybean (Glycine max) and corn (Zea mays) cultivated in soil with adequate levels of base saturation and magnesium content in Brazil. The field trials were conducted on a Typic Hapludox cultivated with soybean and corn in the 2013/2014 and 2014/2015 crop seasons, respectively. Treatments consisted of Mg rates (50, 100, 250, 500, 1,000 and 1,500 g ha-1 and a control without Mg) applied during the V4, R1, and R5.1 (soybean) or V4 and R2 (corn) phenological growth stages as magnesium sulfate heptahydrate (MgSO4∙7H2O). The SPAD index, leaf Mg content, grain yield, and 100-grain weight were evaluated. The Mg foliar spray increased the SPAD index in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Zea mays; Foliar fertilization; Magnesium sulfate. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001201185 |
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