Although phosphorus owns the lowest amount between essential elements in the plant, but due to its important role in the vital processes of the plant, its supply during the growing period of wheat is essential. This study was conducted to investigate the response of wheat to the use of phosphorus in different stages of its growth and in different conditions of water salinity in pots and in soilless culture system. This experiment were performed in the factorial experiment in a completely randomized design with three factors of irrigation water quality (2 and 8 dS / m), phosphorus concentration (30 and 45 mg/l) and the stage of growth of wheat that receives phosphorus (seedling stage, tillering stage, elongation stage of Stem, flowering and seed filling) and three replications. Plants were harvested at the end of the physiological maturation phase. Root and shoot dry weight, shoot phosphorus concentration, chlorophyll and catalase and peroxidase enzymes were measured. Increased salinity decreased 48% phosphorus concentration of shoots, 40% dry weight of roots and shoots and 100 and 50% increase of catalase and peroxidase, respectively. Increasing the concentration of phosphorus from 30 to 45 mg/l caused 10 and 36% increase in dry weight of roots and shoots, respectively. The highest amount of chlorophyll, root and shoot dry weight due to the use of phosphorus was observed in the stem elongation stage and the lowest values were related to the application of phosphorus in the seedling stage. Based on this research, it seems that fertilization is necessary during the wheat growth period, especially in the stage of elongation of the stem and flowering.

Keywords: Salinity, Phosphorus, Wheat, Growth stages

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