This experiment was to study the effect of N fertilization levels (basal, additional and annual) on the dry matter (DM) and total nitrogen (TN) yields of orchardgrass varieties when up to 400 ㎏ of N fertilization per Nectar was applied under the hay-type management. 1. Maximum yields of the first cutting were obtained at about the 200 ㎏/㏊ level of the basal N fertilization for Kitamidori and Latar. There may be a limiting basal N application level for the DM and TN yields in these varieties. But the yields of S143 increased quadratically up to the 300 ㎏/㏊ level. 2. Absorption ability of the basal N fertilizer may be continued until the early heading stage and available soil N may be absorbed even at the end of the heading stage. 3. Vertical distribution of the DM and TN yields were different between the N fertilization levels and the varieties. Particularly, the distribution of TN yields on the plant height were different among the varieties. In Kitamidori, a large amount of TN yield distributed in the medium layer (30-70 ㎝), and in Latar and S143 it was distributed in the basal layer (0-30 ㎝) at less N application levels than 150 ㎏/㏊. 4. The DM and TN yields in each growth stage of the second cutting increased until the middle of September(9/09). Results may indicate that regrowth season of the middle of September was an optimum time for the second cutting in all varieties. 5. The limiting annual N fertilization levels were different between the varieties and it was due to different absorption ability of the soil nitrogen in the non-fertilized plot. Latar variety with a high absorption ability of the soil nitrogen and with a higher yield of DM in the non-fertilized plot, attained the highest yield at lower levels of N fertilization than the varieties with a low absorption ability in the non-fertilized plot. It was estimated that the highest yields could be obtained at about 300-350 ㎏ N application per Nectar in Latar, 350-400 ㎏ in Kitamidori and 400-450 ㎏ level in S143, respectively.