Understanding the effects of grazing management on tillering dynamics of forage grasses may help identify management practices that optimize pasture production, stability, and ultimately, persistence. The objective of this research was to evaluate the effects of two grazing frequencies (regrowth interrupted when the canopy was 70 cm tall or at 95% canopy light interception [LI]) and two grazing intensities (reduction of 29 [lenient] or 57% [standard] of initial canopy height) in ‘BRS Zuri’ guineagrass [Megathyrsus maximus (Jacq.) B.K. Simon & S. W. L Jacobs (syn. Panicum maximum Jacq.)], under rotational stocking and on herbage accumulation rate (HAR), tiller appearance rate, tiller mortality, tiller survival rate, tiller stability index (SI), tiller population density (TPD), tiller mass (TM), apical meristem height, and tiller half-life during two summer rainy seasons in Piracicaba, Brazil. The experimental design was randomized complete block, with a 2 × 2 factorial arrangement. The HAR was not affected by treatments in the first year, averaging 100 kg dry matter ha⁻¹ d⁻¹, but was greater under lenient than standard grazing (146 and 81 kg dry matter ha⁻¹ d⁻¹, respectively) in the second year. In both years, there were no treatment effects on TPD and TM. The use of 95% LI associated with standard defoliation increased the variability in SI. Great tiller population renewal indicated by short tiller half-life, varying from 31 to 75 d, classifies Zuri as an exploitative cultivar. Zuri guineagrass maintained tiller SI under the grazing treatments imposed but had greater HAR under lenient grazing.

中文翻译：

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轮播条件下'Zuri'麦草的牧草积累和分蘖动态

了解放牧管理对牧草分蘖动态的影响可能有助于确定优化牧场生产、稳定性和最终持久性的管理实践。本研究的目的是评估两种放牧频率（当树冠高 70 厘米或树冠遮光率 [LI] 为 95% 时再生中断）和两种放牧强度（减少 29 [宽松] 或 57% [标准] 的初始冠层高度）在 'BRS Zuri' 几内亚草 [ Megathyrsus maximus (Jacq.) BK Simon & SW L Jacobs (syn. Panicum maximJacq.)]、轮作放养和牧草积累率 (HAR)、分蘖出现率、分蘖死亡率、分蘖存活率、分蘖稳定性指数 (SI)、分蘖种群密度 (TPD)、分蘖质量 (TM)、顶端分生组织巴西皮拉西卡巴两个夏季雨季的高度和分蘖半衰期。实验设计为随机完整区组，采用 2 × 2 因子排列。HAR 在第一年不受处理的影响，平均 100 kg 干物质 ha ^-1 d ^-1，但在宽松条件下比标准放牧（146 和 81 kg 干物质 ha ^-1 d ^-1）更大，分别）在第二年。在这两年中，对 TPD 和 TM 都没有治疗效果。使用与标准落叶相关的 95% LI 增加了 SI 的可变性。分蘖半衰期短，从 31 到 75 天不等，表明分蘖种群更新大，将 Zuri 归类为剥削性品种。Zuri 豚草在施加的放牧处理下保持分蘖SI，但在宽松放牧下具有更高的HAR。