9[3]GERALD K.Quality control and use of composed organic wasters as components of growing media in the Federal Repuplic of Germany[J].Acm Hort,1991,294:89-99.
10[4]BENOIT C.Polyurethane ether foam(PUR)an ecological substrate for soilless growing[J].Polymer-Recycling,1996,2:109-116.