Nitrogen, phosphorus and potassium supply capacity in four organic amendments
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| Autores: | , , |
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| Formato: | artículo original |
| Estado: | Versión publicada |
| Fecha de Publicación: | 2008 |
| Descripción: | Nitrogen, phosphorus, and potassium supply capacity was measured in 4 organic amendments. Analysis of total nutrient content, microbial bioassay, and greenhouse nutrient extraction methodologies were used and compared. The greenhouse assay was carried out using pure materials and a mixture 4:1 soil-organic amendment. Organic amendments were 1 vermicompost (cattle manure) and 3 composts (coffee, sugar cane, and orange wastes). The total nutrient content varied from 0.9-2.12% for N, 0.36 3.02% for P and 0.94-2.21% for K. With the microbial bioassay availability for N varied from 12-30%, 6-23% for P and 5-9% for K. The authors consider that the methodology makes a good estimation of N and P availability, but underestimates that fraction of K. With the greenhouse nutrient extraction, using pure materials, availability of N was 4-15%, 1-4 % for P and 6-49% for K. A high correlation between total nutrient content analysis and microbial bioassay was found and a good one between both laboratory methodologies and the greenhouse nutrient extraction, with mixtures but not for pure materials. Results of this study provide quantitative estimations of N, P and K availability for organic materials which could be used as a reference for future experiments. |
| 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/6733 |
| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/agrocost/article/view/6733 |
| Palabra clave: | Suplemento de nutrimentos abonos orgánicos bioensayo microbiano análisis total de nutrimentos extracción de nutrimentos en invernadero Nutrient supply organic amendments microbial bioassay total nutrient content greenhouse nutrient extraction |