Analysis of soil fertility and its anomalies using an objective model
| Autor: | Francisco J. Rebollo, J. M. Terrón, Francisco J. Moral |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Journal of Plant Nutrition and Soil Science. 175:912-919 |
| ISSN: | 1522-2624 1436-8730 |
| DOI: | 10.1002/jpln.201100361 |
| Popis: | In this work, the use of an objective method, the formulation of the Rasch measurement model, which synthesizes data with different units into a uniform analytical framework, is considered to get representative measures of soil fertility potential in an experimental field. Thus, two types of information about the soil were obtained from soil samples taken at 70 locations: first, the textural components were determined, and, secondly, deep (ECa-90) and shallow (ECa-30) soil apparent electrical conductivity, approximately 0–90 and 0–30 cm depths, respectively, were measured. A latent variable, denominated soil fertility potential, was defined. It is supposed, and later it is verified, that all soil properties previously indicated have a marked influence on the latent variable. The adequate assignment of categorical values across properties measures and the good fit of the data are checked as a previous phase to properly compute the Rasch measures. After applying the Rasch methodology, it was obtained that both electrical conductivities are the most influential properties on soil fertility potential, getting moreover a ranking of all soil samples according to their fertility potential and the unexpected behaviors, called misfits, of some soil samples, which constitute a very useful information to better match soil and crop requirements as they vary in the field, being a rational basis for a site-specific crop management. |
| Databáze: | OpenAIRE |
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