Predictive value of soil exchangeable potassium in mycorrhiza-inoculated banana under organic-mineral fertilization in Cuban Cambisols
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| Autoren: | , , |
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| Format: | artículo original |
| Status: | Versión publicada |
| Publikationsdatum: | 2026 |
| Beschreibung: | Introduction. Banana is a multi-cycle crop, with a high potassium (K) demand, and soil K analysis guides fertilization. Mycorrhizal inoculation reduces fertilizer K needs, yet soil-based K recommendations for inoculated systems remain undefined. Objective. To establish a soil potassium threshold for guiding fertilization in arbuscular mycorrhizal fungi (AMF)-inoculated banana crops under organic mineral fertilization. Materials and methods. Two experiments were conducted in Santo Domingo, Cuba, on Eutric Cambisols using the FHIA-18 cultivar. Both followed a randomized block design with four replicates. The first evaluated five organic-mineral fertilization (OMF) doses, with or without Rhizoglomus irregulare inoculation across mother plant and first ratoon cycles, and included measurements of yield, mycorrhizal indicators, foliar NPK concentrations, and soil fertility. The second, conducted across three crop cycles, involved combinations of OMF doses, Canavalia ensiformis as green manure, AMF inoculation, and mineral fertilization. In this experiment, only information about soil fertility and relative yield was used. Statistical analyses included ANOVA, while critical thresholds were identified using Cate-Nelson successive partitioning. Results. Banana yield increased with OMF dose, and AMF inoculation reduced the OMF requirement by 25 %, associated with higher colonization and improved K uptake. Soil exchangeable K allowed the establishment of soil K-based fertilization thresholds. Inoculation reduced the critical soil K thresholds relative to non-inoculated banana, which reflects enhanced mycorrhizal K acquisition efficiency. The canavalia reduced OMF requirements in inoculated banana but did not alter the soil K index, which remained consistent across inoculated treatments regardless of fertilizer sources. The index functioned as a sufficiency index for K fertilization. Conclusions. The soil K-based index established for AMF-inoculated banana defines the soil K threshold and provides a practical tool for assessing K fertilization sufficiency and guiding input adjustments under the tested edaphic conditions. |
| Land: | Portal de Revistas UCR |
| Institution: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Sprache: | Inglés Español |
| OAI Identifier: | oai:portal.revistas.ucr.ac.cr:article/4632 |
| Online Zugang: | https://revistas.ucr.ac.cr/index.php/ragromeso/article/view/4632 |
| Stichwort: | arbuscular mycorrhizas Canavalia ensiformis fertilizer application Musa spp. soil test values aplicación de fertilizantes micorrizas arbusculares valores de análisis de suelo |