| Summary: | 碩士 === 國立臺灣大學 === 植物病理與微生物學研究所 === 95 === Organic compounds are the most important pollutants in water and soil. This research was aimed to determine the effects of four organic compounds on growth of vegetable plants. Experiments were carried on both hydroponic cultivation and soil cultivation experiments. Four organic compounds including glucose-glutamic acid solution, soybean oil, mineral oil and phenol were applied to tomato, head mustard, cabbage, water convolvulus and lettuce to investigate their effects on these plants.
Glucose-glutamic acid solution was applied to plants at 0, 3750, 7500, 11250 and 15000 mg/L in the hydroponic cultivation experiment, respectively. Results showed that glucose-glutamic acid solution over 3750 mg/L significantly affected the shoot growth, root elongation, fresh weight and dry weight, and caused wilting and root browning symptoms. In the soil cultivation experiment, glucose-glutamic acid solution was applied to plants at 0, 7500 and 15000 mg/L, respectively. When the glucose-glutamic acid solution concentration was higher than 7500 mg/L, the height, root length, fresh weight, dry weight and chlorophyll content were significantly decreased. The symptoms induced by glucose-glutamic acid solution treatment include dwarf, leaf chlorosis, sparse root and root browning.
Soybean oil was applied to plants at 0, 0.5, 0.75, 1, 1.5 ％ in the hydroponic cultivation experiment. When the soybean oil concentration was higher than 0.75 ％, the shoot growth, root elongation, fresh weight and dry weight were significantly reduced. In the soil cultivation experiment, soybean oil was applied to plants at 0, 0.75 and 1.5 ％. The growth of head mustard had no significantly difference compared with control, and the root length was longer at 0.75 ％. At 1.5 ％, the plant growth was significantly inhibited, but the chlorophyll content was not influenced.
Mineral oil was applied to plants at 0, 0.5, 0.75, 1, 1.5 ％ in the hydroponic cultivation experiment. When the mineral oil concentration was higher than 0.5 ％, the shoot growth, root elongation, fresh weight and dry weight were significantly reduced. The leaves of tomato, head mustard, cabbage and lettuce exhibited translucent and oil-soaking symptoms after 2 days treatment, suggesting that the mineral oil could enter plant tissue via root or stem base and then moved into leaves. In the soil cultivation experiment, mineral oil was applied to plants at 0, 0.75 and 1.5 ％, respectively. When the mineral oil concentration was higher than 0.75 ％, the height, root length, fresh weight, dry weight and chlorophyll content were significantly reduced, and caused severe root browning. At concentration of 1.5 ％, the yield loss of tomato, head mustard, and cabbage were up to 90 ％.
Phenol was applied to plants at 0, 50, 100, 200 and 300 mg/L in the hydroponic cultivation experiment. Results showed that phenol over 50 mg/L significantly affected the shoot growth, root elongation, fresh weight and dry weight, and caused root browning. The root browning was more serious when the phenol concentration increased. In the soil cultivation experiment, mineral oil was applied to plants at 0, 100 and 300 mg/L, respectively. When the phenol concentration was higher than 100 mg/L, the height, root length, fresh weight and dry weight were significantly decreased, but chlorophyll content was not influenced.
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