Comparison of conventional and conservation tillage systems and different seeding rates on the response of new rainfed wheat cultivars in rainfed conditions of Kermanshah

This experiment was carried out in order to investigate the conventional and conservation tillage systems and different seeding rates on the response of new wheat cultivars in rainfed conditions during two consecutive growing years of 2016-18 in Sararood Dryland Agricultural Research Center, Kermanshah. The experiment was performed in the form of strip blocks based on a randomized complete block design with three replications at two adjacent sites as conservation tillage and conventional tillage. The first factor was wheat cultivars (Baran and Rijaw) horizontally and the second factor was seed rate: 75, 100, 125, 150, 175, 200, 225 and 250 kg / ha vertically. The results of the combined analysis showed that among the studied traits, Normalized difference vegetation index, SPAD index, leaf area index, plant growth rate, grain yield and harvest index in the first year showed a significant increase. Grain yield as the most important trait was increased 28.7% compared to the second year of the experiment. Conventional tillage operations also increased all the studied traits in comparison. So that grain yield increased by 22.25% in conventional tillage. The application of different amounts of seeds also significantly affected the Normalized difference vegetation index, leaf area index and plant growth rate, and the maximum values of these traits were obtained in 250 kg and the maximum SPAD index in 75 kg/ha. Finally, by applying seed densities of 150 kg/ha the grain yield increased by 15.42%, compared to 75 kg / ha.