Tae-Young Hwang

Crop Analysis through Growth Survey after Wintering of Winter Annual Forages Grown from 2014 to 2015

ABSTRACT In order to identify the causes of various problems related to forage crop growth, such as winter survival, coldness, rainfall, drought etc., and to provide basic data for the stable production and supply of forage year round, we performed a growth survey after the wintering of winter forage crops grown from mid-Sep. 2014 to late-Feb. 2015. The growth of winter forage crops after wintering in the country was generally bad. As shown in the regional distribution in the country, regions with 80% or higher winter survival rates comprised 66%, regions with 79 to 50% winter survival comprised 24.9% and regions with less than 50% winter survival comprised 9.1%. In conclusion, the average winter survival rate was 79% in the country. Winter survival rate and coverage rate after the wintering of winter forage crops under installed drain channels in paddy fields were good at 83% and 80%, respectively. However, the rates without installed drain channels were bad at 67% and 66%, respectively. It was predicted that the crop production of winter forage crops was reduced by 10-15% in Gangwon, Chungbuk, Chungnam, Gyeongnam and Jeonnam regions, reduced by 30% in Gyeonggi, Gyeongbuk and Jeonbuk regions and reduced overall by approximately 19% nationwide.(

Comparison of Agronomic Characteristics, Forage Production and Quality of Kenaf (Hongma 300), Maize (Kwangpyeongok) and Sorghum × Sudangrass Hybrids (Jumbo) in Middle Region of Korea

Tae-Young Hwang*, Hee Chung Ji, Ki Yong Kim, Sang-Hoon Lee, Ki-Won Lee and Gi Jun ChoiNational Institute of Animal Science, RDA, Chenonan, Chungcheongnamdo 331-801, KoreaABSTRACTThis study was conducted from 2013 to 2014 in the middle region of Korea to compare the agronomic characteristics, forage production, and quality of kenaf, maize, and a sorghum×sudangrass hybrid. The three crops used in this study were kenaf “Hongma 300,” maize “Kwangpyeongok,” and the sorghum×sudangrass hybrid “Jumbo”(headless type). The sugar contents of the kenaf, maize, and sorghum×sudangrass hybrid were 5.4%, 4.4%, and 2.5%, respectively. The emergence rates and lodgings of the three crops were sound, as they were more than 80% and 1.5, respectively. The fresh yields of kenaf, maize, and the sorghum× sudangrass hybrid were 117,521 kg/ha, 73,336kg/ha, and 133,334 kg/ha, respectively, and the dry matter(DM) yields were 28,598kg/ha, 19,951 kg/ha and 20,083 kg/ha, respectively. The DM yield of kenaf was significantly the highest among the three crops(p 0.05). However, the total digestible nutrients(TDN) contents of the kenaf, corn, and sorghum×sudangrass hybrid were 43.3 %, 72.0 %, and 54.8 %, respectively, and the in vitro digestible dry matter(IVDDM) yields were 44.4%, 73.7%, and 59.6 %, respectively; therefore, the TDN yield of the corn was 13 % significantly higher than that of the kenaf(p0.05). The TDN yields of the kenaf, corn, and sorghum×sudangrass hybrid were 12,472kg/ha, 14,350kg/ha, and 11,001kg/ha, respectively. Among the three crops, the content of neutral detergent fiber(NDF) and acid detergent fiber(ADF) were highest in the kenaf. This study shows that the kenaf had a good forage productivity but a low forage quality.(Key words :Kenaf, Dry matter, Forage production, Total digestible nutrients yield, Quality)