In April 2005,two investigation sites were selected in Yuanlin Proving Ground of Academy of Agriculture and Forestry Sciences of Ningxia and Tiantan of Zhongning County,respectively.A method with field investigation and chemical analysis in lab was carried out to study the roots distribution of different aged wolfberry and soil nutrients in wolfberry orchard.The wolfberry species was Ningqi No.1,and we chose wolfberry trees with different age to investigate their root distribution,at the same time,soil samp...