SSSAJ -- Bohlen et al. 63 (4): 882 Figure IG9

Fig. 9 Accumulation of ¹⁵N in earthworm tissue in cores treated with ¹⁵N-labeled rye (•—•), manure ( ${blacksquare}$ – – – – ${blacksquare}$ ), or potassium nitrate ( ${blacktriangleup}$ ····· ${blacktriangleup}$ ). Error bars are standard errors