Sustainable Technology for Agriculture at Extreme Altitudes: Design and Evaluation of a Sprinkler Irrigation System in a Peruvian High Andean Community

In high-altitude agroecosystems, erratic rainfall patterns and steep topography severely constrain crop productivity by exposing plants to soil water deficits during critical phenological stages. This study aimed to enhance the productivity of eleven staple and horticultural crops corn (Zea mays), tomato (Solanum lycopersicum), cucumber (Cucumis sativus), eggplant (Solanum melongena), lettuce (Lactuca sativa), carrot (Daucus carota), barley (Hordeum vulgare), celery (Apium graveolens), bean (Phaseolus vulgaris), onion (Allium cepa), and pea (Pisum sativum) through the design and implementation of a sprinkler irrigation system in the San Carlos district of the Peruvian High Andes. The system was designed to accommodate the region's climatic, edaphic, hydrological, and topographic variability across 20.05 hectares, divided into 14 irrigation sectors with slopes ranging from 2% to 53%. Soil characterization revealed sandy loam as the predominant texture (32.14%), with favorable physical properties real density (2.21–2.77 g cm⁻³), bulk density (1.22–1.35 g cm⁻³), and porosity (40.15–53.60%) that facilitated adequate water infiltration and retention. The total irrigation requirement was 20.80 L s⁻¹ (748.80 m³ day⁻¹), with a 10-day interval and 10-hour daily irrigation periods tailored to crop phenological stages. Implementation of the sprinkler system resulted in statistically significant (*p* < 0.05) yield increases across all crops, ranging from 20% (barley, bean, onion, pea) to 133% (eggplant). Horticultural crops particularly eggplant, cucumber, and lettuce exhibited the strongest responses, reflecting their heightened sensitivity to moisture deficits during flowering and fruit set. Economic analysis confirmed the project's viability, with a social Internal Rate of Return (IRR) of 95% and a Benefit–Cost ratio of 5.07. These findings demonstrate that carefully designed sprinkler irrigation can substantially improve agricultural productivity in high-altitude, water-limited environments by alleviating phenological-stage water stress. The system offers a replicable model for sustainable intensification in Andean agroecosystems, contributing to food security, economic resilience, and reduced rural out-migration. Strengthening community participation and water governance is essential to ensure long-term sustainability and regional development impact.