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| Juárez Hernández, Ma. de Jesús. |
| En invernadero se evaluaron diferentes tratamientos de la solución nutritiva universal Steiner para determinar el efecto sobre la concentración de nutrimentos de Lilium híbrido Asiático ‘Brunelo’ en hidroponía. La solución se abasteció diariamente, con un pH entre 5.0-5.5, el sustrato de cultivo fué tezontle rojo con partículas de 1 a 7 mm de diámetro. El diseño de tratamientos fue un factorial 3x3x3. Los factores de estudio fueron: 1) potencial osmótico de la solución nutritiva (-30, -50 y -70 KPa), 2) relación de N-NH4+ cationes (0, 12.5 y 25 % del total de la concentración de cationes) y 3) relación de H2PO4- -aniones (80, 120 y 160 % con respecto a la concentración de este ión en la solución nutritiva Steiner). Se realizaron análisis de... |
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Palavras-chave: Hidroponía; Cationes; Aniones; Solución Steiner; Hydroponics; Cations; Anions; Steiner solution; Doctorado; Edafología. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/262 |
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| Nava,Gilberto; Ernani,Paulo Roberto; Sá,Alessandra Aparecida de; Pereira,Adilson José. |
| Gypsum does not affect the soil negative charges and maintains sulfate in the soil solution, making it one of the cheapest products to increase Ca activity in soil solution, especially in the deeper soil layers. Higher Ca levels in the soil solution can increase the uptake of this nutrient by apple trees, reducing the risk of physiological disorders caused by Ca deficiency. This study assessed the effect of long-term gypsum application on some soil properties and on the chemical composition of leaves and fruits of an apple cultivar susceptible to fruit disorders associated with low Ca. The experiment was conducted in São Joaquim, in the South of Brazil, from 2001 to 2009. Gypsum rates of 0, 1.0, 2.0 and 3.0 t ha-1 were annually broadcast over the soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Downward movement; Cations; Nutritional status; Calcium. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100022 |
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| Silva,Ivo Ribeiro; Corrêa,Tarcísio Fernando Cortes; Novais,Roberto Ferreira; Smyth,T. Jot; Rufty,Thomas; Silva,Eulene Francisco; Gebrim,Fabrício Oliveira; Nunes,Flancer Novais. |
| The protective effect of cations, especially Ca and Mg, against aluminum (Al) rhizotoxicity has been extensively investigated in the last decades. The mechanisms by which the process occurs are however only beginning to be elucidated. Six experiments were carried out here to characterize the protective effect of Mg application in relation to timing, location and crop specificity: Experiment 1 - Protective effect of Mg compared to Ca; Experiment 2 - Protective effect of Mg on distinct root classes of 15 soybean genotypes; Experiment 3 - Effect of timing of Mg supply on the response of soybean cvs. to Al; Experiment 4 - Investigating whether the Mg protective effect is apoplastic or simplastic using a split-root system; Experiment 5 - Protective effect of Mg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soybean; Cations; Calcium; Rhizotoxicity; Soil acidity. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000100007 |
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