This project aims to conduct original research bridging irrigation science - agronomy- soil science and participatory processes, within the framework of a collaboration between the two research units Eco&Sols and Geau, bringing together soil scientists specialized on nutrient cycles and soil biota, systemic and practice-oriented agronomists and irrigation fluid mechanics specialists. Taking the opportunity of various ongoing projects (described in a following section) and the current call, the team aims at initiating a PhD-level research work on characterizing and co-experimenting with farmers improvement pathways of a locally existing innovative agroecological practice of artisanal manure-based tea extracts in irrigated agriculture in North Africa.