Macon type soyybean which was recommended by Karadeniz Agricultural Research Institute was used. Plant yield was recorded during two years and in addition to this interested parmeters such as plant length, height of the first pod, the number of pods per plant, thousand seed mass, seed yield, and the number of secondary branches on the main stem were measured. This research plan was setup in approximately o.o5 ha for two different area with five repetitions for completely randomized design on Karadeniz Agricultural Research Institute in Samsun-Turkey for two years. Subsoiling application was accomplished only one of the areas. The penetration resistance was measured with a soil penetrometer. The results show that the effect of subsoiling application was found statistically significant at p