عنوان مقاله [English]
This research in the form split plot in format of random complete block design in three replays was implemented. The main plots consist of three levels of potassium sulfate fertilizer, 1- no potassium sulfate, 2- 70 kg/ha pure potassium 3- 140 kg/ha pure potassium, from the source potassium sulfate fertilizer, and subplots inclusive three levels of super absorbent polymer with amounts: 1- no super absorbent, 2- 50 kg/ha super absorbent, 3- 100 kg/ha super absorbent. The results showed Increased potassium sulfate up to 140 kg/ha and super absorbent up to 100 kg/ha cause improvement and increase total dry matter process, leaf area index, crop growth rate and net assimilation rate were. The difference between levels of potassium sulfate fertilizer was also significant in terms of number of pods per plant, number of seeds per pod, 1000 seed weight, grain yield, biological yield at 1% probability level and harvest index at 5% level. The difference between super absorbent polymer surfaces in all measured traits was significant at 1% probability level. In the interaction between potassium sulfate and super adsorbent, 1000 seed weight, grain yield, biological yield at 1% probability level and harvest index were significant at 5% probability level, but In the remaining traits no significant difference was observed. The highest grain yield with 140 kg/ha of potassium sulfate and 100 kg/ha of super absorbent polymer with 4336 kg/ha and the lowest grain yield in control treatment (without application of potassium sulfate and superabsorbent) with 1334 kg/ha. According to the results, application of 140 kg ha-1 of potassium sulfate and 100 kg ha-1 of super absorbent polymer in terms of physiological indices and yield the results are acceptable and can be recommended in the region.