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KMID : 0380119990220020079
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Korean Journal of Ecology
1999 Volume.22 No. 2 p.79 ~ p.83
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Effects of Ozone on Crops and Protective Effects of Ethylenediurea as an Anti-Oxidant
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Yun Myoung-Hui
Lee Woong-Sang
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Abstract
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Phytotoxic effects of ozone and ethylenediurea (EDU) on soybean (Glycine max) and spinach (Spinacia oleracea) were observed by using open-top field chamber system (OTC). Gas exchange rates (photosynthesis, stomatal conductance and transpiration rates) of soybean plants were decreased by 20% to 30% by ambient ozone and resulted in 30% reductio of seed yields. In OTC, ambient ozone and 0.12 ㎕/ℓ O_3 decreased gas exchange rates of spinach by 25% to 40% and by 50%, respectively. The protective effect of EDU against ozone induced injury was obtained at 100 ㎎/ℓ on soybean, and at 250 ㎎/ℓ on spinach, respectively. The excessive application of EDU, however, inhibited photosynthesis, transpiration, and stomatal conductance without any specific visible damage.
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