Impacts of Nitrogen and Phosphorus Fertilization on Biomass, Polyphenol Contents, and Essential Oil Yield and Composition of Vitex negundo Linn

Li-Chen Peng and Lean-Teik Ng
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Li-Chen Peng: Department of Agricultural Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
Lean-Teik Ng: Department of Agricultural Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

Agriculture, 2022, vol. 12, issue 6, 1-13

Abstract: Nutrient management has increasingly become important in producing quality medicinal plant materials. Vitex negundo is an important perennial medicinal plant widely distributed in tropical Asia and Africa. This study aimed to examine the effects of nitrogen (N) and phosphorus (P) fertilization on the biomass, polyphenol contents, and essential oil yield and composition in field cultivated V. negundo . Two field experiments were conducted; one was performed on three different rates of N fertilizer (50, 100, and 200 kg-N ha −1 ), and the other was on different P fertilizer rates (50, 100, and 200 kg-P ha −1 ), with their respective control groups receiving no fertilization under field conditions. The results showed that at 200 kg-P ha −1 , V. negundo had the highest biomass and essential oil yield, the highest number of volatile components (45 compounds), and the content of bioactive ingredients ( β -caryophyllene and eremophilene). Polyphenol contents were not significantly different between treatments. This study indicates that 200 kg-P ha −1 (NPK ratio of 1:2:1) treatment positively affects the yield of biomass, essential oils, and bioactive compounds in field cultivated V. negundo .

Keywords: medicinal plant; nutrient management; bioactive compounds; ?-caryophyllene; eremophilene (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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