Effect of Climate and Density on Diferent popullations of Milk Thistle (Silybum Marianum L.)

The kind of population, climate and density have a significant influence on the various properties of the Milk Thistle. Therefore, the impact of two temperate and cold climate on the four native populations collected from Shush, Poldoktar, Khorramabad and Aleshtar and a cultivar were evaluated as a randomized complete block design in a few years and places. As Well as an experimental was performed in the form of Split plot includes three different densities of 6, 8 and 10 plants/m2 as subplots and populations of Milk Thistle as main plots for two years from 2014-2015. The results showed that the climate had significant impact on traits such as plant height, grain yield and Silybin. Results of the interaction effects showed that The maximum amount of Silymarin (21 mg.g) and Silybin (4.2 mg.g) was obtained in native population of Aleshtar and in the cold region. Also the highest of plant height, grain and biological yield was obtained at density of 8 plants/m2 but the density did not affect on the amount of Silymarin.