EFFECT OF IRRIGATION SCHEDULING UNDER SURFACE AND SUB-SURFACELOCALIZED IRRIGATION SYSTEMS ON BEAN PRODUCTIVITY

The sustainable agricultural development strategy relies on optimizing field irrigation water use through modern systems that align with Egypts goal of efficient water utilization. Given limited water resources and the governments push for modern irrigation in existing farmland, this approach promises improved economic returns and better irrigation management regarding timing and quantity. To enhance water resource utilization for local bean crops in Egyptian conditions, our research aims to improve both subsurface and surface localized irrigation systems. Addressing water scarcity, especially in older farmlands, calls for transitioning from traditional surface localized irrigation to modern methods. We conducted a 2022-2023 open field experiment on clay soil at Giza Governorate. The research objectives were studying the impact of two irrigation methods surface localized irrigation method and subsurface localized irrigation method with three different levels of irrigation water applications, on moisture distribution, water productivity and some physiological indicators of crop plant length, number of branches, number of horns, number of seeds, plant weight and productivity. The results showed no significant difference between the treatment of surface localized irrigation with 100% water requirements and subsurface localized irrigation with 80% water requirement. Consequently, using subsurface localized irrigation with only 80% of irrigation requirements will achieve almost the same results with less irrigation water consumption. On the same regard, results showed that, the highest water productivity was obtained in the treatments A80 (4.7 kg/m³) compared to the treatments B80, C80 and A100where the water productivity were 4.5 kg/m³ 4.4 kg/m³ and 4.3 kg/m³ respectively, meanwhile the lowest water productivity was obtained in the treatment C100 which was 3.5 kg/m³.