Citrus is suggested to be one of the most important fruit crops all over the world, especially in warm temperate regions, occupied the third position between fruit crops in the world after grapes and apples.
Sweet oranges the main grown citrus species in world, Valencia orange cv, ranks the first position between different Sweet oranges kinds all over the world.
Salinity of soil and irrigation water regimes and drought conditions are considered to be serious and major problems that faces Valencia orange growers in the dry regions, also, alkaline soils and mal-nutrition reduced citrus production.
Generally, natural compounds (Magnetite and humate)can be used as soil improvement products with a superior "residual effect" in the soil and cheaper in compared to other chemical substances which practically used in agricultural systems. Application will help in a lowering cost and give safety product for crops users and increasing benefits as time function than other chemical applications.
The main benefit for these materials in soil systems has been substantiated; increases nutrient availability, increased soil pH, increase cation exchange capacity (CEC) .