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Direct Measurement of Denitrification Using ¹⁵N-labeled Fertilizer Applied to Turfgrass

^a Dep. of Hortic. Sci., 305 Alderman Hall, 1970 Folwell Ave., Univ. of Minnesota, St. Paul, MN 55108
^b Dep. of Natural Resources and Environmental Sci., 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801

View larger version (28K): [in a new window]   Fig. 1. Daily measurements of labeled fertilizer N (LFN) and total N evolved as N2 and N2O from Kentucky bluegrass cores fertilized with 15N-labeled KNO3 during the spring field experiment. Mass spectrometric results from the three 3-h flux measurements from within each replication were summed, and values are reported as a mean of two replications. Daily atmospheric volume measurements were performed using the Ne technique during collection of N2 and N2O. Volume measurements are reported in mL as means of the two replications. Standard errors are reported for each calculated mean.

View larger version (23K): [in a new window]   Fig. 2. Daily measurements of labeled fertilizer N (LFN) and total N evolved as N2 and N2O from Kentucky bluegrass cores fertilized with 15N-labeled KNO3 during the summer field experiment. Mass spectrometric results from the three 3-h flux measurements from within each replication were summed, and values are reported as a mean of two replications. Daily atmospheric volume measurements were performed using the Ne technique during collection of N2 and N2O. Volume measurements are reported in mL as means of the two replications. Standard errors are reported for each calculated mean.

View larger version (19K): [in a new window]   Fig. 3. Average daily soil temperature readings reported from May through September 1999.

View larger version (30K): [in a new window]   Fig. 4. Daily measurements of labeled fertilizer N (LFN) and total N evolved as N2 and N2O from Kentucky bluegrass cores and bare soil cores fertilized with 15N-labeled KNO3 in the greenhouse. Values are reported as a mean of two replications. Daily atmospheric volume measurements were performed using the Ne technique during collection of N2 and N2O. Volume measurements are reported in mL as means of the two replications. Standard errors are reported for each calculated mean.

View larger version (31K): [in a new window]   Fig. 5. Daily measurements of LFN and total N evolved as N2 and N2O from creeping bentgrass cores fertilized with 15N-labeled KNO3 or urea in the field. Weekly fertilizer applications were made from 18 July through 21 Aug. 2000. Values reported are means of the two replications. Standard errors are reported for each calculated mean. Arrows indicate fertilizer applications.