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Effect of High-Humidity and High Temperature at Kentucky Bluegrass Growth in Summer  

Lee, Jeong-Ho (Dept. of Biological Resources and Technology, Yonsei Univ.)
Choi, Jun-Yong (Dept. of Biological Resources and Technology, Yonsei Univ.)
Lee, Song-Ho (L-green Co. Ltd)
Joo, Young-Kyoo (Dept. of Biological Resources and Technology, Yonsei Univ.)
Publication Information
Asian Journal of Turfgrass Science / v.22, no.2, 2008 , pp. 133-140 More about this Journal
Abstract
The growth of root and shoot normally decline dramatically in mid-summer of Korea, moreover the cool-season turfgrassgrass eventually wither to death over $30^{\circ}C$. The increase of air temperature also drives the heat of soil, that makes stress on root system. The heat stress affects physiological mechanisms of hormonal unbalance that stimulates shoot growth, photosynthesis, and transpiration. To solve those problems, many studies have been carried out to control soil moisture and OM content to decrease soil temperature for dissolving the growth retardant by heat stress. This study initiated to analyze the change of soil temperature with soil moisture, and the effect of soil depth and moisture content on heat transmit and thermal changes on turfgrass growth(productivity, green color, and damage by dryness and high temperature). Kentucky bluegrass plots prepared with 25%, 33%, 40% soil moisture treatments. Soil temperature was measured every five min. with four thermo-sensors at 12 and 2 cm soil depth. The most acceptable growth showed at 33% soil moisture, but the worst result showed at 40%. The soil moisture seriously affected on the growth of Kentucky bluegrass, however the quality of turfgrass may acceptable if we can control soil moisture down to 33% when the flooding season of monsoon.
Keywords
Kentucky bluegrass; high temperature; high-humidity;
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