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Int. J. Environ. Res. Public Health 2014, 11(4), 4427-4440; doi:10.3390/ijerph110404427
Article

Effects of Nitrogen Fertilizers on the Growth and Nitrate Content of Lettuce (Lactuca sativa L.)

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Received: 18 February 2014; in revised form: 8 April 2014 / Accepted: 14 April 2014 / Published: 22 April 2014
(This article belongs to the Special Issue IJERPH: 10th Anniversary)
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Abstract: Nitrogen is an essential element for plant growth and development; however, due to environmental pollution, high nitrate concentrations accumulate in the edible parts of these leafy vegetables, particularly if excessive nitrogen fertilizer has been applied. Consuming these crops can harm human health; thus, developing a suitable strategy for the agricultural application of nitrogen fertilizer is important. Organic, inorganic, and liquid fertilizers were utilized in this study to investigate their effect on nitrate concentrations and lettuce growth. The results of this pot experiment show that the total nitrogen concentration in soil and the nitrate concentration in lettuce increased as the amount of nitrogen fertilizer increased. If the recommended amount of inorganic fertilizer (200 kg·N·ha−1) is used as a standard of comparison, lettuce augmented with organic fertilizers (200 kg·N·ha−1) have significantly longer and wider leaves, higher shoot, and lower concentrations of nitrate.
Keywords: inorganic fertilizer; lettuce; liquid fertilizer; nitrate; organic fertilizer inorganic fertilizer; lettuce; liquid fertilizer; nitrate; organic fertilizer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Liu, C.-W.; Sung, Y.; Chen, B.-C.; Lai, H.-Y. Effects of Nitrogen Fertilizers on the Growth and Nitrate Content of Lettuce (Lactuca sativa L.). Int. J. Environ. Res. Public Health 2014, 11, 4427-4440.

AMA Style

Liu C-W, Sung Y, Chen B-C, Lai H-Y. Effects of Nitrogen Fertilizers on the Growth and Nitrate Content of Lettuce (Lactuca sativa L.). International Journal of Environmental Research and Public Health. 2014; 11(4):4427-4440.

Chicago/Turabian Style

Liu, Cheng-Wei; Sung, Yu; Chen, Bo-Ching; Lai, Hung-Yu. 2014. "Effects of Nitrogen Fertilizers on the Growth and Nitrate Content of Lettuce (Lactuca sativa L.)." Int. J. Environ. Res. Public Health 11, no. 4: 4427-4440.



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