[Influences of Base Fertilizer Dosage and Root Size on Quality and Yield of Gentiana crassicaulis Root].

Objective: In order to optimize the base fertilizer dosage and root size of Gentiana crassicaulis in Ludian,Yulong, Yunnan,the differences in yield and quality of Gentiana crassicaulis caused by different base fertilizer dosage and root size were investigated.

Methods: The variation in fresh weight, dry weight, drying rate, length, diameter, branches as well as the contents of gentiopicroside, loganin acid, alcohol-soluble extract and total ash were determined. The ideal distance grey relational degree comprehensive evaluation method was applied to make a comprehensive evaluation on the quality and yield of Gentiana crassicaulis.

Results: There were big differences in yield and quality of Gentiana crassicaulis among different base fertilizer dosage and root size. 2 000 kg/667 m2 of manure, 20 kg/667 m2 of superphosphate, 100 kg/667 m2 of plant ash and mix size of transplanting roots showed the best comprehensive quality and the highest yield.

Conclusion: 2 000 kg/667 m2 of manure, 20 kg/667 m2 of superphosphate,100 kg/667 m2 of plant ash, high quality transplanting roots and stagger certain depth to transplant are highly recommended to produce high quality and high yield of Gentiana crassicaulis in Ludian, Yulong, Yunnan.