Size and shape determination of an experimental unit, with the maximum curvature method, for corn (Zea mays) yield trials, Guanacaste, Costa Rica
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| Autores: | , |
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| 格式: | artículo original |
| 狀態: | Versión publicada |
| Fecha de Publicación: | 2017 |
| 實物特徵: | A study was conducted to determine the adequate size and shape of an experimental unit for corn yield trials in the canton of Santa Cruz, Guanacaste, Costa Rica. A uniformity trial was seeded and the data obtained were used to apply the method of maximum curvature. The point of maximum curvature – determined by visual inspection – where the curve, product of the association between plot size and coefficient of variation stops falling abruptly and taking an almost constant behavior, was located between 12 and 16 basic units. Through the first derivative, it was estimated that the point of maximum curvature was 12 basic units. Using the method proposed by Fairfield Smith in 1938, a value of 0.62 for the soil heterogeneity index was obtained, indicating the soil can be classified as heterogeneous (the area of this measurement scale goes from 0 to 1, where 0 indicates complete homogeneity and 1 complete heterogeneity). There was no difference between the forms associated with the size of 12 basic units; however, for practical reasons, the form of 6 X 2 was considered the most suitable. |
| País: | Portal de Revistas UNED |
| 機構: | Universidad Estatal a Distancia |
| Repositorio: | Portal de Revistas UNED |
| 語言: | Español |
| OAI Identifier: | oai:revistas.investiga.uned.ac.cr:article/1689 |
| 在線閱讀: | https://revistas.uned.ac.cr/index.php/cuadernos/article/view/1689 |
| Palabra clave: | plot size plot shape corn maximum curvature method soil heterogeneity Smith´s index. tamaño de unidad experimental forma de unidad experimental maíz curvatura máxima heterogeneidad del suelo índice de Smith. |