Comparison of Nitrate Accumulation in Lettuce Grown under Chemical Fertilizer or Compost Applications
2006
Lee, Y.J. (Daegu University, Gyeongsan, Republic of Korea) | Chung, J.B. (Daegu University, Gyeongsan, Republic of Korea), E-mail: jbchung@daegu.ac.kr
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. Contents of NH₄-N in the soils of compost applications were much lower than those found in the soil of chemical fertilizer application. Two weeks after lettuce transplant, NH₄-N was not found in the soils of compost applications, and in the soils of chemical fertilizers application NH₄-N was not found three weeks after lettuce transplant.
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