TRIFLURALIN LEACHING IN SOILS CULTIVATED WITH SUGARCANE IRRIGATED BY SUB-SURFACE DRIP SYSTEM
DOI:
https://doi.org/10.15809/irriga.2012v17n1p39Resumen
1 ABSTRACT
In order to assess the movement of trifluralin in soils, used as root intrusion inhibitor in sub-surface drip irrigation system (SDI), its concentration at effluent from lysimeters was measured. The lysimeters with sugarcane (Sacharum officinarum L.) under natural weather conditions and supplementary irrigation were filled with two Oxisols and an Ultisol. Three lysimeters with undisturbed soil were used as replicates for each treatment; the columns were one meter in diameter and 45cm deep. The SDI system consisted of drippers installed at 20cm depth, with 10.5mm internal diameter tubing with 6 emitters per lysimeter spaced 50cm between them. A moisture sensor was installed in each lysimeter to monitor the soil water tension. A weather station was installed besides the lysimeters, in order to supply weather information. Precipitation, volume of leachate, and trifluralin concentration in the effluent were measured during 65 days. There was no change on the SDI system flow rate. The LVA presented the highest amounts of leached compound, which was above the EPA limit and lower than the allowed by Brazilian law.
Keywords: Sub-surface drip irrigation system, contamination, percolation, leaching, herbicide.
Descargas
Publicado
Cómo citar
Número
Sección
Licencia
Esta revista proporciona acceso público a todo su contenido, siguiendo el principio de que el libre acceso a la investigación genera un mayor intercambio de conocimiento global. Dicho acceso está asociado con una lectura y cita cada vez mayores del trabajo de un autor. Los derechos de autor de los artículos publicados en Revista Irriga son propiedad de los autores, con los primeros derechos de publicación de la revista. Debido a que aparecen en esta revista de acceso público, los artículos son de uso gratuito, para sus propios fines, con fines educativos y no comerciales. Se pueden obtener más detalles en http://creativecommons.org/licenses/by-nc-nd/4.0