계화도 간척지에서 석고, 팽화왕겨 및 제올라이트 처리가 토양 중 양이온 함량에 미치는 영향
Influence of Gypsum, Popped Rice Hulls and Zeolite on Contents of Ca2+, Mg2+, Na+, K+ in Reclaimed Tideland Soils in Kyehwado
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초록
The effect of application of gypsum (G), popped rice hulls (PRH), and zeolite (Z) in exchangeable cations concentrations of reclaimed tideland soil in Kyehwado was investigated for 3 years from 2004 to 2006 in a pot experiment with bermuda grass (Cynodon dactylon). Treatments with three soil conditioner and with three applications were established with three replications; G1 (1,550 kg 10 a-1), G2 (3,100), and G3 (6,200) for gypsum, H1 (1,000), H2 (2,000), and H3 (3,000) for PRH, and HZ1 (200), HZ2 (400), and HZ3 (800) for co-application of zeolite with PRH at the 1,500 kg 10 a-1. At 60, 90, 120 days after treatment (DAT), exchangeable cations (K+, Na+, Mg2+, and Ca2+) were analyzed. Gypsum application significantly decreased K+, Na+, Mg2+ in the soil probably due to exchange and subsequent leaching of these cations by Ca2+ from the gypsum applied. Overall, K+ concentration was gradually decreased by continuous application of soil conditioners and was in the order of 2004>2005>2006 regardless of the kinds and application rate of soil conditioners. Comparing K+ concentrations among the soil conditioners in the same year, its concentration was in the order of gypsum<PRH<PRH+zeolite. Gypsum rather than other conditioners considerably decreased Na+ concentration; i.e. Na+ concentration was in the order of gypsum<<PRH<PRH+zeolite in 2006. Concentration of Mg2+ also showed a similar pattern to Na+. Gypsum application significantly increased Ca2+ concentration and in the gypsum treated soil Ca2+ concentration increased with years.
Abstract
The effect of application of gypsum (G), popped rice hulls (PRH), and zeolite (Z) in exchangeable cations concentrations of reclaimed tideland soil in Kyehwado was investigated for 3 years from 2004 to 2006 in a pot experiment with bermuda grass (Cynodon dactylon). Treatments with three soil conditioner and with three applications were established with three replications; G1 (1,550 kg 10 a-1), G2 (3,100), and G3 (6,200) for gypsum, H1 (1,000), H2 (2,000), and H3 (3,000) for PRH, and HZ1 (200), HZ2 (400), and HZ3 (800) for co-application of zeolite with PRH at the 1,500 kg 10 a-1. At 60, 90, 120 days after treatment (DAT), exchangeable cations (K+, Na+, Mg2+, and Ca2+) were analyzed. Gypsum application significantly decreased K+, Na+, Mg2+ in the soil probably due to exchange and subsequent leaching of these cations by Ca2+ from the gypsum applied. Overall, K+ concentration was gradually decreased by continuous application of soil conditioners and was in the order of 2004>2005>2006 regardless of the kinds and application rate of soil conditioners. Comparing K+ concentrations among the soil conditioners in the same year, its concentration was in the order of gypsum<PRH<PRH+zeolite. Gypsum rather than other conditioners considerably decreased Na+ concentration; i.e. Na+ concentration was in the order of gypsum<<PRH<PRH+zeolite in 2006. Concentration of Mg2+ also showed a similar pattern to Na+. Gypsum application significantly increased Ca2+ concentration and in the gypsum treated soil Ca2+ concentration increased with years.
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