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KMID : 0903619950360040493
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Journal of the Korean Society for Horticultural Science
1995 Volume.36 No. 4 p.493 ~ p.499
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Effect of Dissolved Oxygen on the Leaf Water Potentials , leaf Nutrient Compositions , Root Activities of ´ Tsugaru ´ Apple Tree and the Chemical Environment of Rhizosphere
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Abstract
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We periodically investigated the effect of dissolved oxygen on the leaf water potentials, leaf nutrient compositions and root activities of ´Tsugau´ apple tree and the surrounding soil chemical environments to grasp a clue to the induction mechanism of early defoliation. We conducted a completely randomized pot experiment of 2-year old ´Tsugaru´ /M26 apple tree under the translucent plastic roof during the period from July 22 to October 9 in 1992.
Prior to treatment, soil water content of each pot was controlled to that of a field capacity (-30 ㎪). The soil employed was sandy loam. Four treatments of water status were performed in three replicates each: (A) waterlogging; (B) waterlogging with continuous aeration; (C) exchanging with continuously flowing tap water; (D) drought; and (E) a control treatment. Control treatment was referred to as a soil water status of field capacity. Tap water was circulated around each control pot to minimize the physiological stress due to abrupt increase in soil temperature.
Oxygen deficit in rhizosphere caused the increase in water-extractable Fe^(+2) and Mn^(+2) by reducing soil environment. Reduced chemical environment of rhizosphere induced a nutritional unbalance and subsequently decreased root activities to which physiological activities of tree was closely related. With root activity measured, oxygen environment of rhizosphere would provide a good indication of physiological status of the tree.
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