ABSTRACT

Frost injury is a concern in early-sown spring wheat (Triticum aestivum) in the Tokai region of Japan. To assess the efficacy of ground rolling as a technique for avoiding frost injury, we investigated its effects on the apical development and yield of ‘Ayahikari’ spring wheat. In both 2018–19 and 2019–20, rolling delayed spikelet initiation by 4–5 days, the start of internode elongation by 5–12 days, and jointing by 3–9 days, but did not affect the apical development rate, which depended on the thermal time. Ground rolling prevented frost injury in 2018–19 but not in 2019–20, probably because the warmer-than-average winter promoted earlier jointing, and so plants were exposed to later low temperatures in February. These results suggest that ground rolling is an effective method for avoiding frost injury in spring wheat during cold winters.

摘要

霜害是早播春小麦（Triticum aestivum ）的一个问题) 在日本的东海地区。为了评估碾压作为一种避免霜害技术的功效，我们研究了它对‘Ayahikari’春小麦顶端发育和产量的影响。在 2018-19 和 2019-20 年，滚动延迟小穗起始 4-5 天，节间伸长开始延迟 5-12 天，拔节延迟 3-9 天，但不影响顶端发育率，这取决于在热时间。碾压在 2018-19 年防止了霜冻伤害，但在 2019-20 年却没有，这可能是因为比平均水平温暖的冬季促进了更早的拔节，因此植物在 2 月份暴露在较晚的低温下。这些结果表明，在寒冷的冬季，碾压是避免春小麦冻害的有效方法。