gentiana davidii/potassium

OBJECTIVE To find the best fertilizer formula of yield-quality-fertilizer effect, and to establish a new comprehensive evaluation-fertilizer effect method. METHODS Grey related degree analysis and DTOPSIS method were combined to comprehensive evaluate the 11 indexes of 14 fertilizer formulas of

To study the effect of phosphorus( P) and potassium( K) fertilization on four iridoids in axial and lateral root of Gentiana crassicaulis. Field experiment was conducted based on phosphorus and potassium,and the content of four iridoids was analyzed in the axial and lateral root of Gentiana