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Comparison of Nitrate Accumulation in Lettuce Grown under Chemical Fertilizer or Compost Applications
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 Title & Authors
Comparison of Nitrate Accumulation in Lettuce Grown under Chemical Fertilizer or Compost Applications
Lee, Yoon-Jung; Chung, Jong-Bae;
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Accumulation of nitrate in green vegetables is undesirable due to potential risks to human health. Lettuce was cultivated in pots under greenhouse conditions with compost applications of 2,000 and 4,000 kg/10a, and the growth and nitrate accumulation of lettuce were compared with those found in the lettuce cultivated with chemical fertilizers of recommended levels. Content of in the soils of compost applications were much lower than those found in the soil of chemical fertilizer application. Two weeks after lettuce transplant was not found in the soils of compost applications, and in the soils of chemical fertilizers application was not found three weeks after lettuce transplant. One week after lettuce transplant content of was much higher in the soils of compost applications, and the contents were rapidly decreased. While, the content of in the soil of chemical fertilizers application was rapidly increased due to the nitrification of released from the applied urea. At the time of harvest contents of in the soils of compost applications were less than 1.4 mg/kg, but in the soil of chemical fertilizers application the content of was 54.2 mg/kg. Contents of in lettuce were about 20 mg/kg FW and were not much different among the treatments. However, contents of in lettuce were significantly different between the treatments of chemical fertilizer and compost. There were significant differences in fresh and dry weights, and growth of lettuce in the compost treatment of 4,000 kg/10a was highest among the treatments. These results indicate that the cultivation with compost only as N source can produce higher yield of lettuce and significantly reduce nitrate accumulation as compared to the conventional cultivation with chemical fertilizers.
lettuce;compost;chemical fertilizer;nitrate;nitrate accumulation;
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HPLC-UV를 이용한 농산물의 질산염 함량분석,조성애;김은희;한성희;육동현;김정헌;박석기;

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