Affiliation: | SONG Zi-lin1,3, YAG Gai-he2,3, FENG Yong-zhong2,3, REN Guang-xin2,3 and HAN Xin-hui2,3 1 College of Forestry, Northwest A&F University, Yangling 712100, P.R.China 2 College of Agronomy, Northwest A&F University, Yangling 712100, P.R.China 3 Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province, Yangling 712100, P.R.China |