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Effects of perennial ryegrass competition on bermudagrass and hybrid bermudagrass cover, biomass, and total nonstructural carbohydrate accumulation
Crop Science ( IF 2.3 ) Pub Date : 2021-05-26 , DOI: 10.1002/csc2.20554
John M. Peppers 1 , Tyler L. Mittlesteadt 2 , Shawn D. Askew 1
Affiliation  

To extend golf play in early summer or hasten athletic field preparation in late summer, turf managers often desire to allow perennial ryegrass (Lolium perenne L.) to persist and compete with overseeded bermudagrass (Cynodon dactylon L. Pers.) or hybrid bermudagrass (Cynodon dactylon × C. transvaalensis Burtt Davy) during optimal growing conditions. Understanding how competition-free growing degree-days (CFGDD) influence bermudagrass total nonstructural carbohydrates (TNC), biomass, and visual green cover may aid in turf-use scheduling. Twenty-four weekly treatments of foramsulfuron eliminated perennial ryegrass competition in replicate plots and allowed assessment of competition-free bermudagrass coverage, biomass, and TNC as related to cumulative heat and light units. Results from this study indicate that bermudagrass coverage is a function of cumulative CFGDD and competition-free daily light integral (CFDLI) but is dependent on locations or years where cultivars or seasonal legacy are variable. At three locations, ‘Patriot’ and ‘Midiron’ hybrid bermudagrass and ‘Riviera’ bermudagrass required 603, 709, and 959 CFGDD and 2,447, 3,271, and 4,556 mol m–2 CFDLI to reach 97% coverage, respectively. Trends of TNC per unit area, however, continued to increase after full coverage was achieved and up to the point at which no more heat or light units were accumulated in fall. Absence of a clear asymptote in the trends suggests that heat or light units that were seasonally accumulated in Blacksburg, VA, were insufficient to achieve maximum bermudagrass carbohydrate reserves before winter dormancy.

中文翻译:

多年生黑麦草竞争对狗牙根和杂交狗牙根覆盖度、生物量和非结构性碳水化合物总积累的影响

为了在初夏延长打高尔夫球的时间或在夏末加快运动场准备,草皮管理者通常希望让多年生黑麦草 ( Lolium perenne L.) 继续存在并与交割的狗牙根 ( Cynodon dactylon L. Pers. ) 或杂交狗牙根 ( Cynodon Dactylon × C. transvaalensisBurtt Davy)在最佳生长条件下。了解无竞争生长度日 (CFGDD) 如何影响百慕大草的总非结构碳水化合物 (TNC)、生物量和可见的绿色覆盖,可能有助于草皮使用计划。每周 24 次的甲磺隆处理消除了重复样地中多年生黑麦草的竞争,并允许评估与累积热量和光照单位相关的无竞争百慕大覆盖率、生物量和 TNC。这项研究的结果表明,百慕大覆盖率是累积 CFGDD 和无竞争日光积分 (CFDLI) 的函数,但取决于品种或季节性遗产可变的地点或年份。在三个位置,“Patriot”和“Midiron”混合百慕大草和“Riviera”百慕大草需要 603、709 和 959 CFGDD 以及 2,447、3,271 和 4,–2 CFDLI 分别达到 97% 的覆盖率。然而,在实现全面覆盖后,单位面积的 TNC 趋势继续增加,直到秋季不再累积热量或光单元。趋势中缺乏明确的渐近线表明,弗吉尼亚州布莱克斯堡季节性积累的热量或光单位不足以在冬季休眠前达到最大的百慕大碳水化合物储备。
更新日期:2021-05-26
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