RESPONSE OF SOME QUALITY INDICATORS OF GRAIN YIELD OF BREAD WHEAT CULTIVARS TO SPRAYING WITH NANO-POTASSIUM FERTILIZER

A field experiment was conducted in plot numbered 95 affiliated to Al-Mahaweel district, north of Babylon, during the seasons 2020-2021 and 2021-2022. In order to know the response of three bread wheat cultivars to the stages and concentrations of nano-spraying potassium. A randomized complete block design (RCBD) was used in a split-split plot with three replicates, where the cultivars(Abu Ghraib, Hawler, Aras) occupied the main plot, and the spraying stages (tilleting, elongation, booting) occupied the sub plot, while potassium nano-fertilizer concentrations occupied ( 2,1,0 g/L) for sub-sub-plot. The results showed that the Abu Ghraib cultivar had the highest values for traits of harvest index and for both seasons, with averages reaching (36.45 and 37.29), respectively, while the Aras cultivar excelled in trait of the percentage of carbohydrates in the grains and for the two seasons, with averages reaching (66.21% and 66.90%), and the Hewler cultivar excelled in trait of the percentage of nitrogen in the grains for both seasons, with an average of (1.97% and 2.02%), respectively, and the percentage of phosphorus in the grains, for the two seasons, with an average of (0.43% and 0.49%), respectively, and the percentage of potassium in the grains, for both seasons, with an average of (2.73%, 2.89%), respectively. The spraying treatment of nano potassium at a concentration of 2 gm L-1 was excelled and recorded the highest averages of (31.18 and 32.34) for the harvest index, (62.05% and 62.85%) for the carbohydrate percentage, (1.74% and 1.79%) for the nitrogen percentage, and (0.40% and 0.47%). ) for the phosphorus percentage and (2.60% and 2.77%) for the potassium percentage, respectively, for both seasons.