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Chemical priming to improve annual bluegrass survival of ice encasement
Agronomy Journal ( IF 2.1 ) Pub Date : 2020-08-20 , DOI: 10.1002/agj2.20420
Kevin Laskowski 1 , Emily Merewitz 1
Affiliation  

Broadly applicable management strategies to prepare turfgrasses for overwintering are lacking. This research aimed to investigate whether chemical priming in the field may improve the survival of the perennial form of annual bluegrass (Poa annua L.) after ice encasement. Annual bluegrass field plots were treated in the summer and fall of 2017 and 2018 with salicylic acid (SA), jasmonic acid (JA), trinexapac‐ethyl (TE), Civitas (active ingredient: mineral oil), and combinations of each chemical or were not treated. Civitas and Civitas + TE‐treated plants had the highest level of turfgrass quality throughout the summer and fall. Normalized difference vegetative index (NDVI) and dark green color index (DGCI) indicated that JA + TE and Civitas + TE had consistently higher values than controls on many dates. Plant plugs were transferred from the field to a low temperature growth chamber (–4°C) for ice encasement or no ice treatment. Following ice encasement for 40 or 80 d, all treatments except for TE alone showed some significant improvements in annual bluegrass recovery. Treatment of annual bluegrass in the summer and fall with Civitas, TE + Civitas, JA, and TE + JA preceding ice encasement may improve recovery from prolonged ice encasement and be useful turf management practices. Without ice encasement at low temperature, Civitas was the only treatment that improved recovery. The chemical treatments that improved ice encasement recovery may alter annual bluegrass fatty acid ratios, such as by increasing the unsaturated fatty acid, linoleic acid.

中文翻译:

化学底漆可提高冰套的年度蓝草存活率

缺乏为越冬准备草皮草的广泛适用的管理策略。这项研究旨在调查该领域的化学引发是否可以改善一年生多年生蓝草(Poa annua)的生存。L.)冰封后。在2017年的夏季和秋季以及2018年的夏季和秋季,使用水杨酸(SA),茉莉酸(JA),抗倒酯(TE),Civitas(有效成分:矿物油)以及每种化学物质或没有得到治疗。在整个夏季和秋季,Civitas和Civitas + TE处理过的植物的草皮草质量最高。归一化植物营养指数(NDVI)和深绿色指数(DGCI)表明,在许多日期,JA + TE和Civitas + TE的值始终高于对照。将植株从田间转移到低温生长室(–4°C)中进行冰封或不进行冰处理。覆冰40或80天后,除单独使用TE外,所有其他处理均显示蓝草的年回收率显着提高。在冰袋装填之前,在夏季和秋季使用Civitas,TE + Civitas,JA和TE + JA对一年生禾本科草进行处理可以改善长期装冰的恢复,并且是有用的草坪管理方法。没有低温下的冰封,Civitas是提高回收率的唯一方法。改善冰套回收率的化学处理方法可能会改变年度蓝草脂肪酸的比例,例如通过增加不饱和脂肪酸亚油酸。
更新日期:2020-08-20
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