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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Detalles Bibliográficos
Autores: Vargas Rojas, Jorge Claudio, Navarro Flores, Juan Ramon
Formato: artículo original
Estado:Versión publicada
Fecha de Publicación:2017
Descripción: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
Institución:Universidad Estatal a Distancia
Repositorio:Portal de Revistas UNED
Lenguaje:Español
OAI Identifier:oai:revistas.investiga.uned.ac.cr:article/1689
Acceso en línea:https://revistas.uned.ac.cr/index.php/cuadernos/article/view/1689
Access Level:acceso abierto
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.