Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Efecto de la aplicación de enmiendas orgánicas en un sistema de cosecha de agua con Acacia saligna en laderas degradadas de la Región de Coquimbo

Auteur : Navarro Álvarez, Andrés Javier ;

Université de soutenance : Universidad de Chile

Grade : Ingeniero Agrónomo 2014

Résumé
In order to diversify amendments and nutrient sources for a sustainable management of soil and water, a field experiment was conducted on a hillslope with Acacia saligna plants distributed in 18 stone half-moons amended with goat manure and/or organic emulsion (15 to 30 Mg ha -1 and 100 to 200 L ha -1 , respectively). Changes in the chemical properties of the soil surface were assessed by a preliminary measurement first, another at the moment of application and a third one a year later. The amendments had an impact on the properties, but only pH showed an increasing temporal trend in all the treatments. Electrical conductivity increased mostly in treatments with goat manure, not exceeding 4,0 dS m . Organic matter proved to be erratic, due to the extreme aridity of the zone. In general terms, a temporary increase in available macronutrients and total nitrogen was observed after amendment application, all of which decreased later due to plant uptake. It is concluded that more frequent applications of these amendments are required, and also that commercial application rates are very far from inducing changes in arid zones and in these small engineered areas, so they must be conceptually replaced by reclamation rates, according to the extreme degradation conditions that prevail.

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