Effects of hairy vetch, rye, and alternating cultivation of rye-vetch cover crops on soil nutrient concentrations and the production of red pepper ( Capsicum annuum L. ) - Sang-Min, Lee; Hong-Bae, Yun; Mengmeng, Gu; Jwa-Kyung, Sung; Nan-Hee, An; Byung-Mo, Lee; Jeong-Rae,Cho; Seok-Kyun, Jung; Hyun-Sug, Choi