关键词: 党参；密度；施肥量；品质；浸出物；农残；重金属；病害率

Abstract:

This paper studied on the roots grade, extractum, pesticide residue, heavy metal, disease infection rate under the effects of different transplanting density and fertilizing amount, in order to get the best combinations of density and fertilizer amount. Then high quality and good commercial products will be produced.  The results showed that the first grade roots are focused on the density of 0.6 million roots/hm2. The second grade is mainly produced by the combination of 0.9 million roots/hm2 density and 360 kg/hm2 fertilizer amount. The different rate order of second grade is 0.6 million roots/hm2＞0.9 million roots/hm2＞0.75 million roots/hm2＞1.05 million roots/hm2. The whole products are occupied by the third grade roots. All extractums are higher than the standard value, and 4 combination values are more than 70.0%. The content of heavy metals is lower than the standard. Under the same density, the maximum contents of As and Cu have been checked out from the fertilizer of 360 kg/hm2, Pb checked out from zero fertilizing, Cd almost being equal to 0.01%, but Hg changing irregularly. The rate of root disease appears reducing with the increase of fertilizer amount under the same density, and the combination of 0.75 million roots/hm2 and 360 kg/hm2 fertilizer gets the minimum 1.48%. Density and fertilizer amount have played very important roles and the excellent combinations are able to produce high quality roots. It is very important for quality and commercial characters of Codnopsis pilosula（Franch.）Naff, when the combination of density and fertilizer amount reaches an ideal level.

Key words: Codnopsis pilosula（Franch.）Naff, density, fertilizing amount, quality, extractum, pesticide residue, heavy metal, disease infection rate