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KMID : 0903619970380020137
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Journal of the Korean Society for Horticultural Science
1997 Volume.38 No. 2 p.137 ~ p.141
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Effect of Subsoil - Breaking Impact on Some Soil Physical Properties and Fruit Quality of Apples
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김기열/Kim, Ki Yeol
임명순/박진면/노희명/Yiem, Myoung Soon/Park, Jin Myeon/Ro, Hee Myoung
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Abstract
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We observed the 2-year effect of subsoil-breaking impact on some soil physical properties, shoot growth and fruit quality of apples. We initiated field experiments in 1994 on the apple orchards where subsoil-breaking treatments were coducted in either spring, autumn, or both of each year by exploding the compressed air (10 kgf·㎝^(-2)) in subsoil at every 3-m spacing along the trees. Two field experimental sites were sandy loam and clay loam, respectively. Saturated hydraulic conductivities obtained at the fields treated in spring and autumn were 6.5 times higher in clay loam and 12 times higher in sandy loam soils compared to those of untreated fields. On the other hand, bulk densities of subsoils decreased by 0.11 to 0.27 Mg m^(-3) and the corresponding porosities increased by 4.2 to 10.1% in spring and autumn treatment compared to those of untreated fields, while those of surface soils remained unaffected. The results showed subsoil-breaking impact of spring and autumn treatment was the most effective regardless of soil texture but such influence on soil physical properties was greater on sandy loam soil. Subsoil-breaking impact was effective on shoot growth of apple trees in clay loam but adversely effective in sandy loam soils. The average fruit weight and the score of visible fruit color increased with subsoil-breaking treatments in the clay loam while no statistical difference was observed in the sandy loam. Since favorable influence on major fruit characteristics was observed even though less improvement of soil physical properties of clay loam was attained, we considered a subsoil-breaking practice on such soils at least once a year (in spring) was favorable.
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