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| Montes,Rafael Marangoni; Parent,Léon Étienne; Amorim,Daniel Angelucci de; Rozane,Danilo Eduardo; Parent,Sergie-Étienne; Natale,William; Modesto,Viviane Cristina. |
| ABSTRACT Soil fertility evaluation through soil analysis traditionally does not consider interaction among elements. To include the interaction effect in interpretation of soil analyses, an experiment was conducted to evaluate the effect of nitrogen fertilization (0, 0.5, 1.0, and 2.0 kg N per plant per cycle) with urea (45 % N) and potassium fertilization (0, 0.55, 1.1, and 2.2 kg K2O per plant per cycle) with potassium chloride (60 % K2O) on soil cationic balance. The experiment was carried out in an irrigated commercial production area of ‘Paluma’ guava, for five consecutive cycles, 2009 through 2012, using the concept of isometric log ratio (ilr) to evaluate soil cationic balance through [K, Ca, Mg | H+Al], [K | Ca, Mg] and [Ca | Mg] balances. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compositional analysis of data; Isometric log ratio (ilr); Psidium guajava L.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100539 |
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| Montes,Rafael Marangoni; Parent,Léon Étienne; Amorim,Daniel Angelucci de; Rozane,Danilo Eduardo; Parent,Sergie-Étienne; Natale,William; Modesto,Viviane Cristina. |
| ABSTRACT Guava response to fertilization can be monitored through plant tissue analysis. Correct interpretation of these results, based on standard levels, is of great importance for correct nutrient management of the crop. However, standard levels are constantly criticized for not considering interactions among elements. To improve the nutritional diagnosis of ‘Paluma’ guava (Psidium guajava L., Myrtaceae), an experiment was conducted using nitrogen fertilization (0, 0.5, 1.0, and 2.0 kg per plant per cycle of N, with urea as a source with 45 % N), and potassium fertilization (0, 0.55, 1.1, and 2.2 kg per plant per cycle of K2O, with potassium chloride as a source with 60 % K2O) in an irrigated commercial area for five consecutive cycles, 2009 through... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Isometric log ratio (ilr); Mineral nutrition; Nutrient balance; Compositional analysis. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100534 |
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| Marchand,Sébastien; Parent,Serge-Étienne; Deland,Jean-Pierre; Parent,Léon-Étienne. |
| Fertilizer recommendations for cranberry crops are guided by plant and soil tests. However, critical tissue concentration ranges used for diagnostic purposes are inherently biased by nutrient interactions and physiological age. Compositional data analysis using isometric log ratios (ilr) of nutrients as well as time detrending can avoid numerical biases. The objective was to derive unbiased nutrient signature standards for cranberry in Quebec and compare those standards to literature data. Field trials were conducted during 3 consecutive years with varying P treatments at six commercial sites in Quebec. Leaf tissues were analyzed for N, P, K, Ca, Mg, B, Cu, Zn, Mn and Fe. The analytical results were transformed into ilr nutrient balances of parts and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compositional Nutrient Diagnosis (CND); Isometric log ratio (ilr); Aitchison distance; Nutrient balance ranges. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452013000100034 |
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