共 4 条
[1]
Characteristics of conventional and organic apple productionin the United States. Edward Slattery,Michael Livingston,Catherine Greene,etal. . 2011
[2]
A brief overview of the history andphilosophyoforganic agriculture. Geoge Kuepper. WorkingPaper ofKerrCenter for Sustainable Agriculture . 2010
[3]
The world of agriculture 2012. Gilles Weidmann,Lukas Kilcher,Salvador Garibay. . 2012
[4]
USDA accomplishments 2009-2011:organicagriculture. Tom Vilsack. . 2012