Effects of Different Tillage Systems on Soil Physical Properties and Dryland Wheat Grain Yield in Spring Forage–Wheat Rotation

Effects of tillage on wheat yield in forage-wheat rotation are still unknown in Iran. So, this study was performed in order to investigate the effects of different methods of tillage on soil physical properties and yield of dryland wheat in rotation with spring forage hay. This experiment was carried out with 6 treatments and 3 replications for 3 years in RCBD statistical design in Maragheh region. The results showed significant differences for yield components in spring planted forage-wheat rotations affected by the treatments.T1 treatment (chisel plough + cyclotiller + wheat grain driller) had the highest stubble (4.320 ton/ha), grain (2.398 ton/ha) and biologic yield (6.720 ton/ha) and also harvesting index (33.89 %). Soil moisture was significantly different in 3 soil depths between treatments, and T1 treatment had the highest soil moisture in all depths. Bulk density differences was significant in 3 depths andT1 treatment had the lowest bulk density in three depths The results of this study suggest the application of "chisel plough + cyclotiller + wheat grain driller” for wheat production in rotation with winter and spring vetch forage.