Determining optimum sowing date for linseed (Linum usitatissimum L.)
2019
Nakamoto, T. (Kyoto Institute of Technology, Kyoto (Japan). Center for Bioresource Field Science)
Effects of sowing date on yield and yield components of linseed (Linum usitatissimum L.) were studied. Seeds of variety Lirina were sown at one-week intervals from February to December in 2015 and 2016. At least 40 days and 600 growing degree days (based on 5℃) from sowing were needed for flowering. It was possible to produce seeds by spring, summer, and autumn sowing. In spring sowing and in summer sowing, later sowing reduced yield and three yield components, namely, the number of capsules per unit area, the number of seeds per capsule, and single seed weight. In autumn sowing (harvest in the next spring), on the contrary, later sowing increased the yield and the three yield components. The decrease in yield in late spring sowing was considered to have been caused by the high temperature after flowering and that in late summer sowing by the low temperature during maturity. Plants sown early in autumn were vulnerable to lodging and resulted in low yield. It is concluded that the optimal sowing dates for linseed production lie between mid-February and mid-April (spring sowing), between late July and early August (summer sowing), and between middle October and late November (autumn sowing).
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