국내 아스파라거스 생산의 단경기인 12월 생산을 위한 가온시기를 구명코자 수행하였으며 '그린타워' 품종 16~19개월 된 근주를 사용하였다. 가온시기는 2004년 10월 25일부터 2005년 1월 20일 까지 15일 간격으로 7처리로 하였으며 수확시기, 수확량과 품질을 비교하였다. 맹아소요일은 가온시기가 늦어짐에 따라 길어져 12월 30일 가온구에서 52일 로 가장 길게 소요되었으며 이후 점차 짧아졌다. 10월 25일 가온시 11월 7일부터 수확이 가능하였으며, 11월 15일과 11월 30일에 가온할 경우 각각 12월 수확이 가능하였고, 12월 15일 이후 가온 할 경우 1월 상순 이후에 수확이 가능하였다. 주당 순수, 순중 및 총 수량은 휴면이 타파된 1월 10일 이후에 가온하는 처리에서 크게 증가되었다. 그러나 12월 수확을 위해서는 11월 15일에 가온 하는 것이 총수량 및 상품수량에서 각각 607kg/10a와 386kg/10a으로 10월 25일 가온하는 193kg/10a에 비하여 크게 증가되었다. 이상의 결과 제주에서 하우스 재배시 12월 생산을 위한 적정 가온시기는 수량과 품질면에서 11월 15일이 바람직할 것으로 판단되었다.

Background : Rehmannia glutinosa L. that is a perennial plant belonging to the family Scrophulariaceae is one of the most popular local income crops. Recently, the cultivation area of Chungnam (2017) accounts for 50.5% (106 ha) of the whole country. In July and August, which is the off-season at the highest price of R, glutinosa L. This experiment was carried out to develop early harvest cultivation technology for the improve farm income. Methods and Results : In order to investigate the growth characteristic and yield of R, glutinosa L. by using the rhizome of 'Tokang' were transplanted four times at intervals of 10 days from mid-March to mid-April 2017 and 2018. Growth characteristics of the above and under ground part were investigated by 3 repetitions for 10 ea harvested in mid-July. Regression analysis was performed on the relationship between the planting time and fresh root weight. The highest emergence rate was 88.7% in the mid-March, and the highest above ground part growth was observed in the plant height, leaf number, leaf length, leaf width, and fresh leaves weight. The number of days to flowering tended to be shortened to 60, 53, 52, and 49 days from the mid-March to the mid-April. The growth of underground part was also highest in mid-March and the total root weight per 10 a was also 1,127.4 ㎏ in mid-March. The faster the planting time, the higher the yield. The results of the linear regression on the roots weight according to the planting time showed that there was a negative correlation relation between the planting time, the marketable roots weight, rhizome weight and total roots weight. Conclusion : The total roots weight improved by 80% in the mid-March than mid-April. Therefore, mid-March is considered optimal planting time for off-season production of R. glutinosa L.

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.

An attempt is made to analyse characteristic features of heavy rainfalls which occur at the metropolitan area of the Korean peninsular the on- and off- Changma season. For this, two representative heavy rainfall episodes are selected; one is the on-Changma season wherein a torrential rain episode happened at Goyang city on 12 July 2006, and the other is the off-Changma season, a heavy rainfall event in Seoul on 21 September 2006. Both recorded considerable amounts of precipitation, over 250mm in a half-day, which greatly exceeded the amount expected by numerical prediction models at those times, and caused great damage to property and life in the affected area. Similarities in the characteristics of both episodes were shown by; the location of upper-level jet streak and divergence fields of the upper wind over heavy rainfall areas, significantly high equivalent potential temperatures in the low atmospheric layer due to the entrainment of hot and humid air by the low-level jet, and the existence of very dry air and cold air pool in the middle layer of the atmosphere at the peak time of the rainfall events. Among them, differences in dynamic features of the low-level jet and the position of rainfall area along the low-level jet are remarkable.