Effects of nitrogen fertilizers on the growth and nitrate content of lettuce (Lactuca sativa L.).
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.
Department of Post-Modern Agriculture, MingDao University, Changhua 52345, Taiwan. chad888@mdu.edu.tw.
Cheng-Wei
CW
Liu
Department of Horticulture, National Chung Hsing University, Taichung 40227, Taiwan. yusung@dragon.nchu.edu.tw.
Yu
Y
Sung
Department of Post-Modern Agriculture, MingDao University, Changhua 52345, Taiwan. bcchen@mdu.edu.tw.
Bo-Ching
BC
Chen
Department of Post-Modern Agriculture, MingDao University, Changhua 52345, Taiwan. soil.lai@mdu.edu.tw.
Hung-Yu
HY
Lai
D000383:Agriculture / Q000379:methods*; D004553:Electric Conductivity; D005308:Fertilizers; D006863:Hydrogen-Ion Concentration; D018545:Lactuca / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D009566:Nitrates / Q000378:metabolism*; D009584:Nitrogen / Q000494:pharmacology*; D018515:Plant Leaves / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D018520:Plant Shoots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D012987:Soil / Q000737:chemistry
D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D009584:Nitrogen