Abstract
ABSTRACTGreenhouse experiments were conducted to determine the effects of nitrogen (N), phosphorus (P), and potassium (K) fertilizer on biomass yield and flavonoid content of American skullcap (Scutellaria lateriflora). Each experiment was carried out two times and consisted of six levels of each nutrient. The regressions gave maxima for dry matter, baicalein yield, and chrysin yield at 446, 412, and 351 kg N/ha for N fertilizer, respectively. Dry matter yield exhibited linear response to P application. The yield of scutellarein, baicalin, baicalein, and chrysin increased with addition of P. The regression gave maximum for dry matter at 208 kg K/ha for K fertilizer. A linear response to K fertilization was observed for scutellarein concentration. P application had the greatest effect on the flavonoids analyzed, whereas K had least, which may be attributed in part to the presence of K in the fritted clay medium.
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