This study was carried out from 2015 to 2016 to identify the suitable sowing and harvesting dates of summer crops in the mountain of Yeongnam, South Korea. The experimental design consisted of the different sowing and harvesting dates as follows: corn hybrid (Z. mays, Kwangpyeongok) of sowing (May 8, 19, and 27) and harvesting (August 10, 20, and 30); sorghum×sorghum hybrid (Sorghum bicolor x Sorghum bicolor, SS405) of sowing (May 27, June 19 and June 27) and harvesting (August 10, 20, and 30). In corn hybrid, ear rate and dry matter (DM) yield decreased (p<0.05) with the postponement of sowing date. Otherwise, ear rate and DM yield increased (p<0.05) with the postponement of harvesting date. Crude protein content decreased (p<0.05) with the postponement of sowing date, but neutral detergent fiber content increased (p<0.05). In sorghum×sorghum hybrid, plant length and DM yield with the postponement of harvesting date increased (p<0.05), while crude protein content with the postponement of harvesting date decreased (p<0.05). This study concluded that sowing corn hybrid in early May and sorghum×sorghum hybrid in early June then harvest in the middle of August was recommend to increase dry matter yield and feed value.

ABSTRACT
 Ⅰ. 서 론
 Ⅱ. 재료 및 방법
  1. 재배방법
  2. 조사방법
  3. 통계처리
 Ⅲ. 결과 및 고찰
  1. 옥수수의 생육 특성
  2. 옥수수의 사료가치
  3. 수수×수수 교잡종의 생육 특성
  4. 수수×수수 교잡종의 사료가치
 Ⅳ. 요 약
 Ⅴ. 사 사
 Ⅵ. REFERENCES

• 이혁준(경상대학교 응용생명과학부(BK21Plus, 농업생명과학연구원)) | Hyuk-Jun Lee (Division of Applied Life Science (BK21Plus, Institute of Agricultural and Life Science), Gyeongsang National University)
• 주영호(경상대학교 응용생명과학부(BK21Plus, 농업생명과학연구원)) | Young-Ho Joo (Division of Applied Life Science (BK21Plus, Institute of Agricultural and Life Science), Gyeongsang National University)
• 이성신(경상대학교 응용생명과학부(BK21Plus, 농업생명과학연구원)) | Seong-Shin Lee (Division of Applied Life Science (BK21Plus, Institute of Agricultural and Life Science), Gyeongsang National University)
• Dimas H. V. Paradipta(경상대학교 응용생명과학부(BK21Plus, 농업생명과학연구원)) | Dimas Hand Vidya Paradipta
• 한옥규(국립한국농수산대학 식량작물학과/국립식량과학원 중부작물부) | Ouk-Kyu Han (Department of Crop Science, Korea National College of Agriculture and Fisheries/Central Area Crop Breeding Division, NICS, RDA)
• 구자환(국립식량과학원 중부작물부) | Ja-Hwan Ku (Central Area Crop Breeding Division, NICS, RDA)
• 민형규(산청군 농업기술센터) | Hyeong-Gyu Min (Sancheong Agricultural Technology center)
• 오정식(산청군 농업기술센터) | Jung-Sik Oh (Sancheong Agricultural Technology center)
• 김삼철(경상대학교 응용생명과학부(BK21Plus, 농업생명과학연구원)) | Sam-Churl Kim (Division of Applied Life Science (BK21Plus, Institute of Agricultural and Life Science), Gyeongsang National University) Correspondingauthor