Application of magnetic treatment technology for saline irrigation water in agriculture is very limited. Therefore, field experiment was conducted to investigate the influence of magnetic field treatment on the quality of saline groundwater for irrigation and in turn impacts of irrigation by magnetized water on sandy soil properties and maize production under desert conditions in Sinai, Egypt. Magnetic field treatment of irrigation water caused leaching salts below root zones, reduced sodium and chloride accumulation, decreased Na/Cl ratio from 1.01 to 0.89 which mitigated the negative impacts on maize plants in the root zone. Results showed high significant decreases in soil salinity (EC, and SAR) and levels of soil soluble cations and anions in the root zone of soils irrigated with magnetically treated saline water compared to control. Also, sandy soil irrigated with magnetized water had a higher moisture content, available water and soil field capacity compared to control. Irrigation with unmagnetized water induced wetted soil volume of 2575.68 cm3 reflecting low drip irrigation application efficiency of 64.07 %, while wetted soil volume was 2919.24 cm3 reflecting high water application efficiency of 72.62% for irrigation with magnetized water. Results of this research demonstrated significant beneficial effects of magnetic field treatment on saline water quality, sandy soil properties and maize crop yield confirming the possibility of using low quality water for irrigation under water scarcity and arid conditions.

Dual use of water for fish and crop production could be a promising approach to improve irrigation under arid conditions. A watercress pot study was carried out to assess the effects of irrigation by catfish and tilapia aquaculture water on the sandy soil properties as well as the growth parameters of watercress with various combinations of artificial NPK fertilizers at El-Minia Governorate of Egypt (28°18′16″ N latitude and 30°34′38″ E longitude). Catfish aquaculture water had the greatest phytoplankton abundance at 83,762 units (×10⁴/L), while the minimum number of phytoplankton existed in tilapia aquaculture water, recorded at 14,873 units (×10⁴/L). There were significant average changes that varied from 120 to 237 (×10⁴ cfu/mL⁻¹) in total bacterial counts in tilapia and catfish waters. Watercress growth quality parameters closely paralleled at all NPK application rates, indicating that the highest quality plants were produced in pots receiving 25% of the recommended levels and irrigated with catfish aquaculture water. Nitrate concentrations of watercress plants were determined under pollution levels established by the European Commission for leafy and tuber vegetables. In conclusion, the use of microbial and phytoplankton-rich aquaculture water to irrigate vegetables and as fertilizer can maintain a balanced soil ecosystem.

Enhancing Florida Prince peach cultivars' quality, yield, and fruiting in the face of water scarcity was the aim of this study, which was carried out in 2021 at a private orchard in the Wadi Al Natrun district of the Behera Governorate, Egypt. The effects of magnetic fields (MF) on peach production, the quality of irrigation groundwater, and the properties of irrigated sandy soil in arid environments were also investigated. The study found no discernible differences in the water compatibility standards for irrigation between magnetized water (MW) treated with an MF and non-magnetized water. However, using MW for irrigation greatly improved the productivity and efficiency of using fertilizer and water. When compared to irrigation with non-magnetized water (NMW), this resulted in a significant improvement in peach crop output. The results of the study showed that the amount of soil moisture in the root zone of crops increased significantly when MW irrigation was applied. More precisely within the first 200 m of irrigation from the (MF) device, the moisture content rose from 9.61% in the control treatment to 14.24%. When irrigation was extended from 200 to 400 and 600 m, the amount of moisture in the root zone drastically decreased. This illustrates that the effect of magnetizing irrigation water decreases with increasing distance between the irrigation region and the magnetic device at the field's beginning. Moreover, the results showed that the application of (MW) for irrigation resulted in improvements to the soil chemical properties. Consequently, this resulted in increased accessibility to water and improved uptake of fertilizers, ultimately leading to enhanced growth and production of peach trees as compared to irrigation with NMW. However, additional research is necessary to comprehend the elusive mechanism of the (MF) and transform it into a viable technique for sustainable agriculture.

Irrigation with magnetized water can be a propitious technology in agriculture under arid conditions. Field experiment was carried out to investigate impacts of magnetic treatment on irrigation groundwater quality and in turn impacts of magnetized water on irrigated sandy soil properties and peach crop production under desert conditions. Results of this study indicated that there were no significant changes in water suitability criteria for irrigation with magnetized water from unmagnetized significantly were observed by magnetic field treatment. However, irrigation with magnetized water increased water and fertilizer use efficiency and productivity and consequently increased peach crop yield over irrigation with unmagnetized water. Results of this significantly study showed that when sandy soil were irrigated with magnetized water, soil moisture content in root zone increased from 9.45% for control treatment to 12.03 % in the first 200 m irrigation distance from the magnetic field device. Moisture content in root zone was significantly decreased as the irrigation distances increased from 200 to 400 and 600 m distances. This indicates that the effect of magnetizing irrigation water decreases with increasing the irrigation distance from the magnetic device at the head of the field. It could be concluded that, using magnetic technology for groundwater treatment in arid regions would increase the possibility of using saline water for safe irrigation on the long-run.