Ten kinds of Panicum virgatum originated in USA were introduced on hill slope and valley plain in the Ansai research station from 1992 to 1998.The data observed for 7 years illustrate that Panicum virga- turn in 3 to 5 year growth fastigium stage particularly requires soil moisture and gives the highest yield.In view of the change in soil water content,Panicum virgatum helps form a dried layer between 80 and 200 cm from soil surface and it can not be compensated by rainfall in growing season,as well as rain...
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