　‘はるしずく’は福岡県農業総合試験場において，早生，多収，高ビール醸造品質，オオムギ縞萎縮病抵抗性およびうどんこ病抵抗性をもったビール大麦品種の育成を目標に，‘九州二条11号’を母，‘栃系225’を父とした組合せに由来する。

　‘はるしずく’は本県における食糧用二条大麦の標準品種である‘ニシノチカラ’と比較して，出穂期は１日早く，成熟期は同じ早生である。稈長および穂長は短く，穂数は多い。千粒重は大きく，整粒歩合はやや低い。収量性は優れ，検査等級は同程度である。オオムギ縞萎縮病に対しては‘ニシノチカラ’と異なる単因子劣性の抵抗性遺伝子 rym3を持ち，オオムギ縞萎縮ウイルス系統Ⅰ型およびⅢ型に抵抗性である。また，うどんこ病にも抵抗性である。精麦品質は‘ニシノチカラ’と比較して，搗精時間が短く，白度は優れ，澱粉含量は多い。焼酎用としての評価は同等かやや優れる。適地は九州の平坦地帯であり，早生，多収でオオムギ縞萎縮病抵抗性が優れる食糧用二条大麦品種として2004年に熊本県で認定品種，2005年に福岡県で準奨励品種に採用され，同年に‘はるしずく’（二条大麦農林23号）として命名登録された。品種名の意味は，春の光をうけて輝く雫のようにきれいな大麦であることを表す。

　A New Two-rowed Barley Cultivar 'HARUSHIZUKU'. FURUSHO Masahiko, Osamu YAMAGUCHI, Yosuke UCHIMURA, Morihiro TSUKAZAKI, Hiroomi KAI, Takahide BABA, Ryo YOSHIKAWA, Kazue MIZUTA and Minoru YOSHINO (Fukuoka Agricultural Research Center, Chikushino, Fukuoka 818-8549, Japan) Bull. Fukuoka Agric. Res. Cent. 25: 11-15 (2006)

　'HARUSHIZUKU' was a two-rowed spring barley (Hordeum vulgare L.) cultivar developed by the Fukuoka Agricultural Research Center by using the pedigree breeding method and released in 2005. 'HARUSHIZUKU',　tested as 'KYUSHU NIJO 17', was derived from the cross of 'KYUSHU NIJO 11'/'TOCHIKEI 225'. The heading time of 'HARUSHIZUKU' was one day earlier than standard cultivar 'NISHINOCHIKARA' and maturing was same to 'NISHINOCHIKARA'. Culm and spike length were shorter than 'NISHINOCHIKARA' and exceeded 'NISHINOCHIKARA' and 'NISHINOHOSHI' in producing spike number .'HARUSHIZUKU' was inferior to 'NISHINOCHIKARA' in lodging resistance and similar to 'NISHINOCHIKARA' in 1000-grain weight. Percentage of plump grains was slightly less than 'NISHINOCHIKARA'. Grain yield　exceeded 'NISHINOCHIKARA' and　inspection grade was similar to 'NISHINOCHIKARA'. 'HARUSHIZUKU' had good resistance to barley yellow mosaic virus (BaYMV) type I, III by single recessive gene of rym3 and powdery mildew, and moderately resistant to scab. The resistances to wet injury and pre-harvest sprouting were higher than 'AMAGI NIJO'. The overall pearling quality of 'HARUSHIZUKU' was superior to 'NISHINOCHIKARA' and is suitable as a material for Japanese spirit, “Shochu". Based on yield trials performed in several prefectural experiment station, 'HARUSHIZUKU' was expected to be adapted to plain land of the Kyushu areas in Japan. This cultivar has been registered as a recommended cultivar for Fukuoka Prefecture since 2005 and for Kumamoto Prefecture since 2004.