Korea depends almost entirely on imports for malt, the main ingredient in beer. However, the consumer market for domestic malt has not developed in Korea because of the prejudice that the quality of domestic malt is inferior to that of imported malt. This study aimed to analyze the quality of malt from Gwangmaeg (GM) and Hopum (HP), representative domestic beer barley varieties cultivated under varying nitrogen fertilizer application rates (standard fertilizer application, 50% increase in application, and 50% decrease in application), and use the findings as primary data to promote domestic malt consumption. GM’s crude protein and starch contents were significantly (Ρ<0.05) higher and lower, respectively, than those in HP. With decreased fertilizer application (GM: 14.0±0.8% and HP: 11.4±0.4%), the protein content was significantly lower than that with increased fertilizer application (GM: 15.5± 0.3% and HP: 13.1±1.3%). Although there was no difference in -glucan content, starch content tended to increase, indicating quality improvement. Acrospire length, yield, and enzyme titer, quality indicators of malt, increased with further fertilizer application, whereas friability and Kolbach index increased with decreased fertilizer application. For wort qualities, filtration time decreased from 36 to 34 minutes in GM and 55 to 42 minutes in HP, with the wort extraction rate increasing with decreased fertilizer application. These findings showed that decreased nitrogen fertilizer application improves the qualities of malt and wort.

본 연구는 6조 보리를 이용하여 양조한 맥주의 발효 중여러 특성의 변화를 측정하여 6조 보리 맥주의 제품 가능성을 확인해 보았다. 실험은 2조 보리 1종과 6조 보리4종을 이용하여 제맥, 당화, 발효 공정을 통해 맥주를 제조하였으며, 제조 공정 중 발효 특성의 변화를 확인하였다. 발효 특성 항목으로 효모의 생육, 비중, 색도, 거품 안정성,free amino acid, 13개의 관능 속성 변화를 측정하였고, 최종 제품인 맥주의 알코올 함량, 쓴맛, 탁도, diacetyl을 측정하였다. 결과적으로 6조 보리인 다향이 2조 보리인 진양과 발효 kinetics 특성이 가장 유사하게 나타나 맥주 제조에 적합한 것으로 나타났다.

We developed new two-rowed covered barley ‘Gwangmaeg’ superior to ‘Hopum’ that has been widely cultivated in Korea for using beer-materials. ‘Gwanngmaeg’ was related from the line named as ‘Iksan149’ in 2010 after yield trials test in conducted for three years from 2008. And then it was registered to ‘Plant protection right, No. 5847’ in 2016 after field experiment by KSVS(Korea Seed & Variety Service). ‘Gwangmaeg’ has distinct characteristics in winter type (IV) and mid-tall culm length which makes reduce damage by off-season heading and lodging comparing to those of ‘Hopum’. ‘Gwangmaeg’ have characteristics of cold tolerance and disease resistance to BaYMV(Barley yellow mosaic virus) and Net blotch(Pyrenophora teres). Yield of ‘Gwangmaeg’ was about 611kg/10a and 524kg/10a in upland and paddy field condition, respectively, which higher 2-4% than ‘Hopum’, however, it has no significant difference. In quality examination for beer usage, ‘Gwangmaeg’ has lager grain and higher assortment ratio than those of ‘Hopum’. In malt quality, ‘Gwangmaeg’ showed higher and better quality in malt extract rate and diastatic power than those of ‘Hopum’. ‘Gwangmaeg’ would be suitable for the area above –4℃ of daily minimum temperature in January in Korean peninsula.