Effects of Interruption Layer for Capillary Rise on Salt Accumulation and Kentucky Bluegrass (Poa pratensis L.) Growth in Sand Growing Media over the Reclaimed Saline Soil

다국어 초록 (Multilingual Abstract)

This research was conducted to determine the effect of interruption layer for capillary rise on the sand based growing media when growing Kentucky bluegrass on soil reclamation and saline water irrigation. Growing media profile consists of three layers as top soil of 30 cm, 20 cm of the interruption layer for capillary rise and 10 cm of reclaimed paddy soil. Growing media profile was packed in 30 cm diameter column pots. The top soil was a mixture of sand dredged up from Lake Bhunam Tae Ahn, Korea and peat at the ratio of 95:5 by volume. Bottom part of column was covered with plastic net and the pots were soaked into 5 cm depth saline water reservoir with salinity 3-5 dS m-¹.
Kentucky bluegrass was established by sod and irrigated using 2 dS m-¹ saline water (5.7 mm day-¹) in 3 days interval.
The results showed that the largest accumulation of salt in the spring with electrical conductivity in saturated extract (ECe) of 5.4 dS m-¹ and sodium absorption ratio (SAR) 34.0 in growing media without the interruption layer for capillary rise and ECe of 4.6 dS m-¹ and SAR 8.24 at growing media using gravel as the interruption layer for capillary rise material. The interruption layer for capillary rise of gravel and coarse sand reduced the accumulation of Na by 16%and 25%, ECe by 7% and 13% in the growing media. Visual quality of Kentucky bluegrass was higher in growing media with the interruption layer for capillary rise of gravel than no interruption layer by 8.3 compared to 7.9 in rates.
The interruption layer for capillary rise of gravel and coarse sand enhanced the visual quality by 4.1 and 4.0%, root length by 50 and 38%, and root dry weight by 35 and 17% of Kentucky bluegrass, and reduced the accumulation of Na by 16% and 25%, ECe by 7% and 13% in the growing media.

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