2. Material and Method.The present research work investigates rhizosphere soil samples and plant samples of three medicinal plant spe-cies. The. Samples were collected from different habitats of Uttarakhand state of India. The study was started in December 2005 and,, Soil samples were initially collected during January-February 2006. After initial collection the samples, were collected. Regularly at an interval of 2 - 3 months.2.1. Sites.The soil samples for the present investigation were col-lected from different parts of Uttarakhand state viz. Pauri, Garhwal. ,, Haridwar Dehradun Almora and Udham Singh Nagar. The collection sites were chosen such that the samples represented the. Complete state in terms of its major division of Garhwal and Kumaon region; and the different height of Himalayan ranges.The collection sites chosen from district Pauri were.
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