RT Journal Article SR Electronic T1 China's Push to Add by Subtracting Fertilizer JF Science JO Science FD American Association for the Advancement of Science SP 801 OP 801 DO 10.1126/science.327.5967.801 VO 327 IS 5967 A1 Hvistendahl, Mara YR 2010 UL http://science.sciencemag.org/content/327/5967/801.abstract AB