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

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