Strong creeping red fescue (Festuca rubra L. spp. rubra Gaudin) is a cool-season perennial turfgrass widely used in temperate and subalpine regions around the globe. Although creeping red fescue turf is tolerant of shade, low fertility acidic soils, and drought conditions, creeping red fescue seed crops grown in optimal growing environments can lodge, ultimately reducing yield in regions where this important turfgrass is grown for seed. To address this issue, we investigated the effects of two plant growth regulators (PGRs), chlormequat chloride (CCC) and trinexapac-ethyl (TE), on plant height, lodging, and seed yield of strong creeping red fescue over 9 site-years in the Peace River region of western Canada. The study encompassed 6 site-years with first-year stands and 3 site-years with second-year stands. The PGRs were applied alone and in a TE + CCC mixture at the two-node (BBCH 32–33, where BBCH is Biologische Bundesanstalt, Bundessortenamt and Chemische Industrie) and early head emergence (BBCH 51–52) growth stages in first- and second-year stands, respectively. The application of TE, CCC, and their mixture resulted in a differential decrease in lodging and an increase in seed yield in first-year stands. However, PGRs applied at BBCH 51–52 on second-year stands had no effect on seed yield but reduced plant height and lodging. This study found a negative correlation between seed yield and lodging. Among the PGR treatments, the CCC + TE mixture was the most effective in reducing lodging and increasing seed yield of strong creeping red fescue.

中文翻译：

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植物生长调节剂对不同生产环境下红羊茅种子作物的影响


强壮的匍匐红羊茅 （Festuca rubra L. spp. rubra Gaudin） 是一种凉爽季节的多年生草坪草，广泛用于全球温带和亚高山地区。尽管匍匐红羊茅草坪耐阴、低肥力酸性土壤和干旱条件，但在最佳生长环境中生长的匍匐红羊茅种子作物可以停留，最终降低种植这种重要草坪草作为种子的地区的产量。为了解决这个问题，我们研究了两种植物生长调节剂 （PGR），矮壮素氯化物 （CCC） 和三环太平洋乙基 （TE） 对加拿大西部和平河地区强匍匐红羊茅的株高、倒伏和种子产量超过 9 年的影响。该研究包括 6 个第一年林分和 3 个第二年林分。PGR 单独施用，并在 TE + CCC 混合物中施用在二节点（BBCH 32-33，其中 BBCH 是 Biologische Bundesanstalt、Bundessortenamt 和 Chemische Industrie）和早期头出苗 （BBCH 51-52） 生长阶段分别在第一年和第二年林分。TE、CCC 及其混合物的应用导致第一年林分的倒伏减少和种子产量增加。然而，在二年级林分施用 BBCH 51-52 的 PGR 对种子产量没有影响，但降低了植物高度和倒伏。本研究发现种子产量和倒伏之间存在负相关。在 PGR 处理中，CCC + TE 混合物在减少强壮匍匐红羊茅倒伏和提高种子产量方面最有效。