The effect of foliar application of paclobutrazol at different levels of nitrogen on yield and quality of super wheat seeds

Paclobutrazol is a plant growth regulator that reduces gibberellin in plants. In this research, paclobutrazol and nitrogen foliar application was investigated on the yield and grain quality of superwheat hybrid cultivar in Karaj region, in the form of split plots in the form of randomized complete block design with three replications in the crop year 2017-2018. The main factor in this experiment included three different levels of nitrogen (60, 105 and 150 kg/ha) from the urea source, the second factor included two levels of paclobutrazol (zero and 200 mg/liter). The results showed that the application of paclobutrazol increased the grain yield and grain quality of wheat, and with the increase in the amount of nitrogen, the yield, yield components and quality of wheat grain increased. The highest amount of seed yield was 14.05 ton/ha, the number of seeds per spike was 89.35 seeds, the harvest index was 43.41% and the seed protein was 12.44% related to the mutual effects of nitrogen 150 kg per hectare and the application of paclobutrazol. Therefore, in order to increase the yield and quality of wheat grain, it is recommended to use paclobutrazol along with nitrogen at 150 kg per hectare.