伏せ込み促成栽培における遮光フィルム資材を用いたホワイトアスパラガス生産(栽培管理・作型)  [in Japanese] White Asparagus Production with Opaque Film in Rootstock Planting Forcing Culture(Crop Production & Cropping Type)  [in Japanese]

冬期間にホワイトアスパラガスを生産するために伏せ込み促成栽培における若茎の軟白化に関する試験を実施した.1年養成株の根株生重と収量性には強い正の相関関係が認められた.収穫時の光条件は収量性にほとんど影響を与えなかったが,若茎のアントシアニン発生に影響を与えた.遮光フィルム被覆による暗黒条件で収穫された場合,若茎にアントシアニン発生は認めらなかった.休眠打破に必要な低温遭遇量が品種よって異なることから収量性には品種間差が認められた.これらの結果から,休眠性が浅い品種('UC-157F_1','GrandeF_1)の1年養成株を用いた伏せ込み促成栽培において遮光フィルム被覆よる暗黒条件で若茎が収穫された場合,アントシアニン発生がないホワイトアスパラガスの生産が可能であることが示唆された.

To facilitate the production of white asparagus (Asparagus officinalis L.) spears in winter, we studied spear blanching in rootstock planting forcing culture. A strong correlation was observed between the fresh weight of one-year-old rootstocks and their yields. Light conditions during the harvesting time had little influence on the yield, but, they influenced anthocyanin pigmentation in the spear. When asparagus spears were harvested under darkness maintained by an opaque film covering, anthocyanin pigments in the spears disappeared. There were differences between cultivar yields; these were caused by the differences in the extent of chilling exposure, which is necessary for each cultivar to break the dormancy of its rootstock. These results suggested that white asparagus spears can be produced with no anthocyanin pigment in forcing culture by using one-year-old rootstocks of cultivars with a low level of dormancy ('UC-157 F_1', 'GrandeF_1'), if spears are harvested under dark conditions maintained by opaque film covering.