Long-Term Impact of N, P, K Fertilizers in Different Rates on Yield and Quality of <i>Anisodus tanguticus</i> (Maxinowicz) Pascher.

Biomass accumulation and alkaloid content showed a trend of increasing and then decreasing with the application of nitrogen, phosphorus, and potassium, and the biomass accumulation was the highest at the application levels of nitrogen and phosphorus in T6 and T9 and at the application levels of medium and low potassium.

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The alkaloid content showed an increasing trend between October of the first year and June of the second year and a decreasing trend in the second year with the increase in the harvesting period.

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