The evaluation of two promising rainfed wheat cultivars as affected by different seeding rate in conventional and conservation tillage systems

This experiment was conducted to evaluate of two promising rainfed wheat cultivars as affected by different seeding rate in conventional and conservation tillage systems in the research field of the Dryland Agriculture Research Institute (DARI), Sararood branch, Kermanshah, Iran. The experiment layout designed as strip-split plot in a randomized complete block design with 3 replications during two consecutive growing seasons 2017-18 and 2018-19. The tillage systems were placed next to each other as a separate site at two levels: conventional tillage and conservation tillage (no tillage). Wheat cultivars were performed horizontally at two levels (Baran and Rijaw) and the seeding rate was carried out vertically with eight levels (75, 100, 125, 150, 175, 200, 225, 250 kg/ha). The combined results indicated that no-tillage increased soil organic carbon by 0.18% but decreased non-significant grain yield by 18.2% via reducing yield components. In this experiment, a significant difference was observed between cultivars in terms of yield components, but the grain yield was not significant. Comparison of different seeding rate also showed a significant difference between all studied traits except the number of seeds per spike and grain yield. Also the maximum protein content achieved in conventional tillage, Baran cultivar and seeding rate of 75kg/ha. Finally, based on the results of interactions, the maximum grain yield was obtained by conventional tillage, Rijaw cultivar and seeding rate of 175 kg/ha as 2293.7 kg/ha, while the low yield was achieved in the no tillage, Baran cultivar and the seed rate of 75 kg/ha as 1323.02 kg/h