Simulation of control strategies for decision-making regarding Digitaria sanguinalis in glyphosate-resistant soybeans

  1. Fernando H Oreja
  2. Fernando Bastida
  3. José L Gonzalez-Andújar
Revista:
Ciencia e investigación agraria: revista latinoamericana de ciencias de la agricultura

ISSN: 0718-1620

Año de publicación: 2012

Volumen: 39

Número: 2

Páginas: 299-308

Tipo: Artículo

DOI: 10.4067/S0718-16202012000200006 DIALNET GOOGLE SCHOLAR lock_openDialnet editor

Otras publicaciones en: Ciencia e investigación agraria: revista latinoamericana de ciencias de la agricultura

Resumen

Se desarrolló un modelo bioeconómico para la toma de decisión del control de pasto cuaresma (Digitaria sanguinalis), en el cultivo de soja resistente a glifosato, en la Pampa Ondulada de Argentina. Se evaluaron cuatro estrategias de control de la maleza basadas en el uso de glifosato. En ausencia de herbicida (T1), la población de semillas de la maleza aumenta hasta una densidad de equilibrio de 12.079 semillas m-2. Una única aplicación temprana del herbicida (T2), dirigida a un controlar la primera cohorte de la maleza, permite a la segunda producir la suficiente cantidad de semillas para mantener la densidad poblacional del banco del suelo. Una única aplicación tardía del herbicida (T3), dirigida a controlar la primera y la segunda cohorte, resulta en un aumento del banco de semillas a niveles similares a aquellos alcanzados sin tratamiento. Dos aplicaciones en el mismo año dirigidas a controlar ambas cohortes (T4), llevan al banco de semillas luego de 10 años a sólo un 23,17% menos que la densidad predicha para el tratamiento sin control. Las predicciones del modelo indican que en ausencia de control, hay un 93% de pérdida de rendimiento del cultivo a causa de la maleza. La menor reducción del rendimiento del cultivo (27%) fue predicha con la estrategia T2, el control más común utilizado por los productores locales. Esta estrategia lleva a reducciones en la densidad de semillas en el banco del suelo, a mayores rendimientos del cultivo y retornos económicos comparados con las otras estrategias.

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Fuente de los datos: Dialnet