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Studies on winter hardiness in triticale in Hokkaido, Japan II. Influence of sowing time on freezing tolerance in early winter and winter survival of triticale, wheat and rye



Studies on winter hardiness in triticale in Hokkaido, Japan II. Influence of sowing time on freezing tolerance in early winter and winter survival of triticale, wheat and rye



Journal of Rakuno Gakuen University Natural Science 21(1): 109-113



The influence of sowing time on freezing tolerance (as measured by LT-50) in early winter and survival index (five classes: 100, 75, 50, 25, 0) after snow melt were investigated using triticale ( times Triticosecale Wittmack cv. Presto), wheat (cv. Hokushin), and rye (cv. Warko) at Hitsujigaoka, in Sapporo. Each variety was shown in five times (2/Sep., 24/Sep., 3/Oct. and 14/Oct). The decreasing order of freezing tolerance (LT-50 values) in early winter was from rye (-26.0 - -22.5 degree C), to wheat (-19.5 apprx -20.7 degree C), to triticale (-16.1 - -18.7 degree C) at each sowing time. Survival index of wheat (92-75) was higher than those of rye (76-56) and triticale (37-66) at each sowing time. Freezing tolerance and survival index of rye were higher on earlier sowing time, while those of wheat and triticale were highest on the 14th Sep, the optimum sowing date for wheat. Considering from only experimental results, the optimum sowing time of winter triticale in which winter survival index was best, a little earlier than that of wheat in central district of Hokkaido.

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