Effects of Different Methods of Tillage on Vicia (Maragheh Variety) Yield in Rotation with Cereal in Dryland Condition

This study carried out in RCBD with 6 treatments and 3 replication in dry land agricultural research institute during 4 years (2003-2007). In automn tillage treatments and in spring sowing of seeds were completed. Treatments were: T1= Sweep in fall + planting by seed drill in spring, T2= Removing stubble in fall + direct planting by seed drill in spring, T3= Semi-moldboard plow in fall + disk harrow and planting by seed drill in spring, T4= Chisel plow in fall + disk harrow and planting by seed drill in spring, T5= Fertilizer and seed broadcasting by hand and moldboard plow in spring, T6= Chisel plow in fall + fertilizer and seed broadcasting by hand and disk harrow in spring. The results showed that wet and dry forage yields were different among treatments, T4 with 5393 and 3190 kg/ha had the highest forage yield and T5 with 4643 and 2646 kg/ha had the lowest forage yield. This trend was abserved in stubble and grain yield T4 with 3245 and 1121 kg/ha had highest yield and T5 with 2749 and 707 kg/ha had lowest yield. The effect of year on wet and dry forage and grain yields was significantly different (1%) but the intraction of year on treatments was not significant. soil moisture was differ among treatments. moistuer comparison in 3 soil depths showed that T4 treatment was better than other treatments and had 24. 90, 26. 67 and 28. 04 درصد soil moisture and T6 treatment had 18. 92, 19. 18 and 20. 87% soil moisture.