Effect of Magnetized Water and Different Levels of Water Supply on Growth and Yield of Navel Orange Trees
Water deficiency is a global dilemma that limits sustainable development plans in many countries, particularly in arid and semi-arid regions such as Egypt. Citrus is classified as one of the crops that are sensitive to water stress and low water quality, since exposing it to stress, leads to reducing its productivity. Therefore, the need arose for this study, which was carried out during 2016 and 2017 seasons on ten-years-old Washington navel orange trees (Citrus sinenses) budded on sour orange rootstock (Citrus aurantium L.) under sandy loam soil conditions at Belbeis region – El Sharkia Governorate, Egypt. The study aimed to improve water use efficiency and maximize water utilization by using magnetized water technique at different levels of water supply (100, 80 and 60% of ETc i.e. evapotranspiration) under drip irrigation system with high quality River Nile water to determine the most effective treatment. The data revealed that, the irrigation water quantity can be reduced by 20% while maintaining the production and the possibility of increasing it by using magnetic water technique. Additionally, the water use efficiency and the water unit economic return were higher even with the reduction of water quantity by 40%. The most effective treatment in the first season was achieved by magnetized water at 100% or 80% ETc that produced 2.54 and 2.57kg fruit for each cubic meter of irrigation water, respectively. In the second season, magnetized water at 100% ETc produced 3.22 kg fruit for each cubic meter of irrigation. Using magnetic water technique can maximize the utilization of high quality water and reduce the amount of irrigation water consumed.