Sowing Depth Effects on Vetch Yield in Maragheh Dry Lands

Increases forage production and economic production in rainfed condition requires attention to agricultural issues such as determination of appropriate sowing depth. So in order to determine the effect of different sowing depths of vetch this experiment was conducted in Agricultural Research Station of Maragheh as strip plot based on randomized complete block design with three species of vetch V. sativa، V. dasycarpa-kouhak and V. narbonensis velox67 as main plots and three sowing depth as sub factor. Results showed that the effect of sowing depth on Vicia yield was significant at the 1% level and the maximum yield of wet hay، dry hay، straw and seed depth of belong to 8-10 cm depth and respectively are 5. 364، 3. 416، 4. 389 and 1. 081 ton per ha whereas the minimum yield of wet hay، dry hay، straw and seed depth of belong to 2-4 cm depth and respectively are 4. 888، 2. 318، 3. 729 and 0. 825. Among the three Vicia species the highest yield of wet hay، dry hay، straw and seed belongs to V. dasykarpa and respectively are 5. 632، 3. 532، 4. 614 and 1. 065 ton/ha. Soil moisture study in the field of these vetches at the time of 10 % vetch flowering showed water differences. V. dasycarpa had lower water depletion from soil. The amount of average soil water for species included: V. dasycarpa 26. 31، V. sativa 23. 76 and V. narbonesis 22. 5.