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Comparison of Estimates of First-Year Dairy Manure Nitrogen Availability or Recovery Using Nitrogen-15 and Other Techniques

^a Department of Soil Science, University of Wisconsin-Madison, 1525 Observatory Dr., Madison, WI 53706
^b USDA Dairy Forage Research Center, University of Wisconsin-Madison, 1925 Linden Drive West, Madison, WI 53706

View larger version (25K): [in a new window]   Fig. 1. Corn whole-plant nitrogen uptake (WPNU) at various fertilizer and manure N rates after initial manure applications, 1998. Solid line represents the regression (p < 0.001) of WPNU against fertilizer N rate (primary x axis). Secondary x axis shows manure N rate. Dashed lines and bold numbers illustrate the calculation of fertilizer equivalents.