This research was conducted during the 2021-2022 agricultural season a private farm in Kafr-ElSheikh Governorate to evaluate the impact of using a renewable energy source (solar energy) for developed irrigation system in old lands by comparing it to using non -renewable energy sources (electric and diesel) for the same developed irrigation system and the traditional irrigation system to achieve sustainable agricultural development, in addition to the effect of deficit irrigation on plants to improve crop productivity and rationalize irrigation water, which leads to improving the agricultural environment.The research depends on the economic evaluation like total costs of irrigation, energy, agricultural costs also the water unit productivity for winter crops (wheat), the research also depends on data collected from the National Irrigation Development Project in cultivating the wheat crop in Kafr El-Sheikh Governorate.The use of solar energy with developed irrigation system has proved to be better than electric and diesel energy, in addition to being clean energy that does not pollute the environment, inexpensive and available.Deficit irrigation by a ratio 80% of full irrigation, as the decrease in productivity and costs can be overlooked in exchange for the saving in water.The return on water unit, the total revenue and the net return were greater under developed irrigation systems with solar energy (100% water applied) which were 11.74 LE/m3, 18310.6 LE/fed and 10120.6 LE/fed respectively. In addition to saving water and land as a result of using the developed irrigation system.