Irrigation Frequency Effects on Turgor Pressure of Creeping Bentgrass and Soil Air Composition
Irrigation Frequency Effects on Turgor Pressure of Creeping Bentgrass and Soil Air Composition
复制标题
DOI：
10.21273/hortsci.40.1.232
复制
发表时间：
2005-02
期刊：
影响因子：
1.9
通讯作者：
J. Jordan;R. White;James C. Thomas;T. C. Hale;D. Vietor
中科院分区：
文献类型：
--
作者：
J. Jordan;R. White;James C. Thomas;T. C. Hale;D. Vietor
适当的水资源管理是在炎热潮湿的南部各州种植爬行折叠草的管理者的主要责任。浅根系统、沙基根区、高温和高蒸发量的共同作用，经常导致草地早熟禾(Agrostis Palustris Huds)遭受严重的干旱胁迫。绿党。本研究旨在确定灌溉频率对弯曲草蠕变膨胀压力的影响，以及对沙基根区混合物中O2和CO2浓度的影响。共建立81个样地，每个样地1.5×1.5m，建立在USGA类型的根区混合体上，分为9组，每组9个样地。每组都可以单独灌溉。每组一块地种植‘A-4’、‘Crenshaw’、‘Mariner’、‘L-93’或‘Penncross’杂草。对三组分别进行1天、2天和4天更换既往PET的灌溉频率处理。在建立后，在1到2年的时间里测量了叶水势、渗透势、土壤氧浓度和土壤二氧化碳浓度。1997年，与每4天灌溉一次的草坪相比，每1-2天灌溉一次的折尾草在0600小时时的草坪压力显著增加(P=0.05)。由于更干燥的环境条件，1998年没有看到任何差异。土壤空气中O2和CO2的浓度在所有处理中都保持在最适范围内，这表明频繁灌溉导致根区氧气不足可能不是高渗透沙基混合根区基质上生长的斑茅生根深度降低的主要原因。
Proper water management is a major responsibility of managers of creeping bentgrass grown on putting greens in the hot and humid southern states. The combination of shallow root systems, sand-based root zones, high temperatures, and high evaporative demands frequently results in severe drought stress on bentgrass (Agrostis palustris Huds.) greens. This study was initiated to determine the effects of irrigation frequency on creep- ing bentgrass turgor pressure and on the O 2 and CO 2 concentrations in a sand-based root zone mixture. In total, 81 plots, 1.5 × 1.5 m each, were established on a USGA-type root zone mixture and organized into 9 groups of 9 plots each. Each group could be irrigated individually. One plot in each group was planted to either 'A-4', 'Crenshaw', 'Mariner', 'L-93', or 'Penncross' creeping bentgrass. Irrigation frequency treatments of 1-, 2-, and 4- day replacement of historical PET were imposed on three groups each. After establishment, measurements of the leaf water potential, osmotic potential, soil oxygen concentration, and soil carbon dioxide concentrations were made over a 1- to 2-year period. Bentgrass irrigated every 1 or 2 days had significantly (P = 0.05) greater turgor pressures at 0600 hr as compared to turf irrigated every 4 days in 1997. No differences were seen in 1998 due to drier environmental conditions. Concentrations of O 2 and CO 2 in the soil air remained in the optimal range for all treatments, indicating that lack of O 2 in the root zone as a result of frequent irrigation may not be the primary cause for reduced rooting depth of bentgrass grown on highly permeable sand-based root zone mixtures.