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Use of Nitrogen-15 Isotopic Techniques to Estimate Nitrogen Cycling from a Mustard Cover Crop to Potatoes

^a USDA-ARS, Vegetable and Forage Research Unit, 24106 N. Bunn Rd., Prosser, WA 99350
^b USDA-ARS, Soil Plant Nutrient Research Unit, 2150 Centre Ave., Bldg. D, Suite 100, Fort Collins, CO 80526

View larger version (25K): [in this window] [in a new window]   Fig. 1. Average monthly precipitation and air temperatures for years 2002 through 2004.

View larger version (36K): [in this window] [in a new window]   Fig. 2. Plot layout for the (A) 15N labeled microplots in Study I and Study II and residue exchange (B) for Study II.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Amount of N mineralized from mustard residues during a 35-d laboratory incubation. Values are averages of four replicates, bars are standard error at p = 0.05.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Change in 15N atom % excess in mustard residues adjacent to labeled microplots in Exp. II.