Macronutrient absorption and N uptake efficiency, in maize promising hybrid. Patricia Pilar, Ecuador
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| Autores: | , , , , |
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| Formato: | artículo original |
| Estado: | Versión publicada |
| Fecha de Publicación: | 2017 |
| Descripción: | When new genetic materials are released to the market, it is necessary to study their nutrient requirements, the dynamics of nutrient absorption and evaluate their profitability; thus, the objective of this research was to determine the efficiency of nitrogen fertilization and the variation in macronutrient uptake due to 4 doses of nitrogen in a promising maize hybrid, during the dry season, in Patricia Pilar, in the province of Los Ríos, Ecuador. Nitrogen doses of 0, 66, 132 and 198 kg.ha-1 were studied in a randomized complete block design with 4 replicates and the means separated by Tukey’s test (p<0.05). Plants were sampled every 15 days in order to evaluate total dry matter (DM) production and nutrient concentration. N recovery efficiency was evaluated at 110 days (physiological maturity) and grain yield at 120 days. Results showed that for the promissory maize hybrid, application of 132 kg of N.ha-1 increased uptake of N, P, K, Mg and S; but not Ca. The rate of absorption varied according to the nutrient; K was absorbed to a greater extent in the vegetative stage (80%), followed by N (50%); while P absorption was higher (60%) in the reproductive stage. Absorption of Ca, Mg and S followed the trend of DM production. With N application of 132 kg.ha-1, N uptake efficiency (0.5 kg.kg-1) was higher and absorption of CaO and MgO were increased (20.4 kg.ha-1, 18,4 kg.ha-1, respectively). With application 198 kg of N.ha-1, extraction of P2O5, K2O and S were improved (39.1; 35.8 and 3.0 kg.ha-1, respectively), in addition, the promissory hybrid responded to doses of N greater than 132 kg.ha-1 |
| País: | Portal de Revistas UCR |
| Institución: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Lenguaje: | Español |
| OAI Identifier: | oai:portal.ucr.ac.cr:article/31303 |
| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/agrocost/article/view/31303 |
| Palabra clave: | Absorption curves nitrogen recovery efficiency fertilization increase of absorption Curvas de absorción nitrógeno eficiencia de recuperación fertilización incremento de absorción |