Innovative irrigation practices for water resource optimization in agriculture

Irrigation in large-scale farming involves high fixed costs and long-term commitments, with strategic decisions on crop rotation and planning significantly affecting tactical irrigation scheduling. System inertia, with cycles of 3–15 days (commonly 7–8 days), demands early anticipation of water needs. In Midi-Pyrénées, irrigation capacity (4.3 mm/day) falls short of peak maize demand (5.5 mm/day), and equipment is often outdated, with an average age of 11 years. Costs average €360/ha, or 20–25% of total maize production costs. Decision-making is constrained by water availability, equipment, labour, and regulations, with key choices made in autumn and spring. Tools like LORA, IRMA, COGITO, and IRRINOVA® support irrigation management, but farmer adoption remains limited. IRRINOVA® focuses on block-level irrigation using tensiometry and crop stage timing, with growing use by advisory services. Despite proven benefits in dry years, uptake is hindered by lack of consensus and demonstrated impact.