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| Registros recuperados: 11 | |
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| Deuner,Sidnei; Nascimento,Ronaldo do; Ferreira,Ladislau Soares; Badinelli,Pablo Gerson; Kerber,Romel Silva. |
| Considerado o nutriente mais importante, tanto no incremento da produção de grãos como no teor protéico destes, o nitrogênio (N) é também o elemento que mais onera a cultura do milho. Neste trabalho, objetivou-se verificar se a aplicação foliar de nitrogênio influencia o acúmulo de proteínas e parâmetros de crescimento de plantas jovens de milho em comparação com a aplicação de uréia via solo. Para tanto, plantas jovens do híbrido de milho BR 206 receberam aplicações de uréia como fonte de N via foliar e via solo nas concentrações de zero; 0,5% e 1,0%. As plantas foram cultivadas em casa-de-vegetação sendo realizadas três aplicações de N, a primeira aos seis dias após a emergência (DAE) num volume de 10 mL por planta e as duas seguintes aos 10 e 14 DAE com... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Uréia; Fertilização foliar; Zea mays L. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542008000500001 |
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| Nascimento,Ronaldo do; Mosquim,Paulo R.. |
| Os prováveis hormônios vegetais envolvidos no crescimento e acúmulo de proteínas de reserva em sementes de soja foram avaliados por meio do cultivo artificial dos frutos. Explantes de frutos de soja apresentando o pericarpo completamente expandido e sementes com aproximadamente 100 mg de massa fresca foram cultivados in vitro com várias concentrações de ácido naftaleno-acético (ANA), ácido giberélico (GA3), benziladenina (BA) e ácido abscísico (ABA). Esses fitorreguladores foram utilizados inicialmente isolados nas concentrações de 10-7, 10-6, 10-5 e 10-4 mol.L-1 cada um. Em seguida, foram combinados dois a dois, sendo as concentrações determinadas em função dos maiores incrementos na massa seca das sementes observados nos experimentos iniciais. O ANA foi... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ácido giberélico; Explantes; Fitoreguladores. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000300016 |
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| Vicensi,Marcelo; Müller,Marcelo Marques Lopes; Kawakami,Jackson; Nascimento,Ronaldo do; Michalovicz,Leandro; Lopes,Christian. |
| ABSTRACT Applications of phosphogypsum (PG) provide nutrients to the soil and reduce Al3+ activity, favoring soil fertility and root growth, but allow Mg2+ mobilization through the soil profile, resulting in variations in the PG rate required to achieve the optimum crop yield. This study evaluated the effect of application rates and splitting of PG on soil fertility of a Typic Hapludox, as well as the influence on annual crops under no-tillage. Using a (4 × 3) + 1 factorial structure, the treatments consisted of four PG rates (3, 6, 9, and 12 Mg ha-1) and three split applications (P1 = 100 % in 2009; P2 = 50+50 % in 2009 and 2010; P3 = 33+33+33 % in 2009, 2010 and 2011), plus a control without PG. The soil was sampled six months after the last PG... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcium sulfate; Calcium/magnesium ratio; Grain yield. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100515 |
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| Silva,André A. R. da; Veloso,Luana L. de S. A.; Nascimento,Ronaldo do; Nascimento,Elka C. S.; Bezerra,Carlos V. de C.; Pereira,Márcia C. de A.. |
| ABSTRACT Indication of salt-tolerant cotton cultivars can make the agricultural exploitation with saline water irrigation feasible in the Brazilian semi-arid region. Thus, this study aimed to evaluate the gas exchanges and growth of cotton cultivars irrigated with saline water. The study was conducted in pots adapted as drainage lysimeters under greenhouse conditions, using a sandy loam Entisols as substrate. Treatments were distributed in completely randomized design, in 5 x 2 factorial arrangement, relative to five levels of irrigation water electrical conductivity - ECw (1.5, 3.0, 4.5, 6.0 and 7.5 dS m-1) and two cotton cultivars (BRS 368 RF and BRS Safira). Increase in irrigation water salinity inhibits the vegetative growth and gas exchanges of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum L.; Tolerance; Cultivar BRS Safira. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000600393 |
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| Medeiros,Reinaldo F.; Pereira,Walter E.; Rodrigues,Rummenigge de M.; Nascimento,Ronaldo do; Suassuna,Janivan F.; Dantas,Tony A. G.. |
| ABSTRACTStrawberry (Fragaria x ananassa) is a crop that has rapid growth and is highly influenced by fertilization. Due to its development speed, the plant needs to absorb sufficient macronutrients in order to meet its demand. The objective of this research was to evaluate growth and yield of strawberry under different doses of nitrogen (N), phosphorus (P) and potassium (K) fertilization. The treatments, using Box's central composite design, were distributed in randomized blocks with four replicates and consisted of five N doses (0.16, 0.37, 0.88, 1.4 and 1.6 g plant-1) and five P doses (0.3, 0.58, 1.2, 1.8 and 2.1 g plant-1), in the presence (1.67 g plant-1) and absence of K. Seedlings of the cultivar 'Oso Grande' were cultivated in 10-L pots. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fragaria x ananassa Duch.; Nitrogen; Phosphorus; Potassium. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000900865 |
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| Campos,Allan R. F.; Lima,Rosiane L. S. de; Azevedo,Carlos A. V. de; Nascimento,Ronaldo do; Silva,Sonivagno S.. |
| ABSTRACT Nitrogen (N) fertilization associated with planting density is a practice that can improve the physiological aspects and consequently increase the yield of a crop. Thus, this study aimed to evaluate the effects of planting density and N levels on the physiological aspects of jatropha in the ‘Agreste’ region of Paraíba. Treatments consisted of four planting densities (833, 1,111, 1,666 and 2,500 plants ha-1) representing the plots and five N doses (0, 40, 80, 120 and 180 kg ha-1) corresponding the subplots. The effects of treatments on CO2 assimilation rate, internal CO2 concentration, transpiration, stomatal conductance, water use efficiency, instantaneous carboxylation efficiency and SPAD index were analysed. Except for stomatal conductance, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Jatropha curcas; Gas exchange; Nitrogen fertilizer; Water use efficiency. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001201112 |
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| Soares,Lauriane Almeida dos Anjos; Fernandes,Pedro Dantas; Lima,Geovani Soares de; Brito,Marcos Eric Barbosa; Nascimento,Ronaldo do; Arriel,Nair Helena Castro. |
| Abstract: The objective of this work was to evaluate the effects of irrigation management strategies, using low (0.8 dS m-1) and high (9.0 dS m-1) salinity water, on the physiological processes, production variables, and fiber productivity of naturally-colored cotton (Gossypium hirsutum) genotypes during different phenological stages. Three naturally-colored cotton cultivars (BRS Rubi, BRS Topázio, and BRS Safira) were subjected to seven irrigation management strategies, in a 3x7 factorial arrangement, in a randomized complete block design with three replicates. Plants were cultivated in pots in a protected environment. Gas exchange, chlorophyll a fluorescence, fiber production, and productivity and yield variables were evaluated. Salt stress causes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum; Fiber productivity; Quantum yield; Salinity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000600746 |
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| Suassuna,Janivan F.; Fernandes,Pedro D.; Nascimento,Ronaldo do; Oliveira,Ana C. M. de; Brito,Kalyne S. A. de; Melo,Alberto S. de. |
| Devido à importância dos porta-enxertos no sucesso da citricultura e sua influência na tolerância a fatores de estresse, desenvolveu-se este estudo com o objetivo de avaliar a tolerância de porta-enxertos de citros ao estresse hídrico. Estudaram-se dois fatores: manejo hídrico ('sem estresse' e 'com estresse', neste último caso, com irrigação baseada em 50 e 25% da capacidade de campo) e porta-enxerto (10 genótipos de citros fornecidos pelo Programa de Melhoramento Genético de Citros da Embrapa Mandioca e Fruticultura Tropical). Adotou-se o delineamento em blocos casualizados com três repetições e 15 plantas por parcela; avaliaram-se as fitomassas da parte aérea, das folhas, do caule, da raiz e total, além da relação raiz/parte aérea, razão de peso foliar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus spp; Híbridos; Deficiência hídrica; Tolerância. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662012001200007 |
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| Michalovicz,Leandro; Müller,Marcelo Marques Lopes; Foloni,José Salvador Simoneti; Kawakami,Jackson; Nascimento,Ronaldo do; Kramer,Luiz Fernando Machado. |
| Annual crop yield and nutrition have shown differentiated responses to modifications in soil chemical properties brought about by gypsum application. The aim of this study was to evaluate the effect of gypsum application rates on the chemical properties of a Latossolo Bruno (Clayey Oxisol), as well as on the nutrition and yield of a maize-barley succession under no-till. The experiment was set up in November 2009 in Guarapuava, Parana, Brazil, applying gypsum rates of 0.0, 1.5, 3.0, 4.5, and 6.0 Mg ha-1 to the soil surface upon sowing maize, with crop succession of barley. Gypsum application decreased the levels of Al3+ and Mg2+ in the 0.0-0.1 m layer and increased soil pH in the layers from 0.2-0.6 m depth. Gypsum application has increased the levels of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphogypsum; Calcium saturation; Sulfur; Zea mays; Hordeum vulgare. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000500015 |
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| Kramer,Luiz Fernando Machado; Müller,Marcelo Marques Lopes; Tormena,Cássio Antônio; Michalovicz,Leandro; Nascimento,Ronaldo do; Vicensi,Marcelo. |
| Soil management influences the chemical and physical properties of soil. Chemical conditions have been thoroughly studied, while the role of soil physical conditions regarding crop yield has been neglected. This study aimed to analyze the wheat yield and its relationship with physical properties of an Oxisol under no-tillage (NT). The study was carried out between 2010 and 2011, in Reserva do Iguaçu, State of Paraná, Brazil, on the Campo Bonito farm, after 25 years of NT management. Based on harvest maps of barley (2006), wheat (2007) and maize (2009) of a plot (150 ha), zones with higher and lower yield potential (Z1 and Z2, respectively) were identified. Sampling grids with 16 units (50 x 50 m) and three sampling points per unit were established. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil physical quality; Wheat yield; Correlation. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000500011 |
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| Registros recuperados: 11 | |
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