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KMID : 1024520120210030289
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Journal of the Environmental Sciences
2012 Volume.21 No. 3 p.289 ~ p.296
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Computation of Irrigation Interval and Amount as affected by Growing Substrate and Soil Depth Planted with Zoysia japonica in Green Roof during a Dry Summer
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Ju Jin-Hee
Bae Gyu-Tae
Kim Won-Tae
Yoon Yong-Han
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Abstract
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The purpose of this study was to identify the irrigation intervals and the amount of suitable growing substrate needed to achieve the desired shallow-extensive green roof system during a dry summer in Korea. In terms of treatment, three types (SL, P 6 P 2 L 2 , P 4 P 4 L 2 ) with varying soil mixture ratios and two types (15 cm, 25 cm) with varying soil depths were created.
The results have been analyzed after measuring growth and soil water contents. The difference of growth by treatment was significant in terms of green coverage, height, leaf width and photosynthesis. In measurement of chlorophyll content, no difference was detected when measured against soil depth. According to the growth measurement of Zoysia japonica with respect to differing soil mixture ratios in the 15 cm-deep treatment, a statistical difference was detected at the 0.05
significance level in photosynthesis. In case of green coverage, height, chlorophyll content and leaf width, no statistical significance was observed. In case of the 25 cm-deep treatment, a statistical significance was observed in height and photosynthesis. In terms of green coverage, chlorophyll content and leaf width, no statistical significance was detected. In comparisons of soil moisture tension and soil water contents, the irrigation interval and amount were 8 days and 14.9 L in the SL (15 cm) treatment, respectively. The irrigation interval showed for 10 days a 1.3-fold increase, and the irrigation amount was 27.4 L 1.8-fold more than SL (25 cm), respectively. For P 6 P 2 L 2 (15 cm) treatment, the irrigation interval and amount were 12 days and 20.7 L, respectively. However, an irrigation interval under P 6 P 2 L 2 (25 cm) was for 15 days 1.3 times longer than P 6 P 2 L 2 (15 cm), and an irrigation amount of 40 L was 1.9 times more than that under P 6 P 2 L 2 (15 cm). In P 4 P 4 L 2 (15 cm) treatment, it was indicated that the irrigation interval was 15 days, and the irrigation amount was 19.2 L. It was not needed to
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KEYWORD
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Soil moisture tension, Water management, Zoysia japonica
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