. 2018 Apr 4;9:634. doi: 10.3389/fmicb.2018.00634

Table 1.

Shannon indices (mean ± standard deviation) of microbial communities in triplicate soil samples.

Urea (μg N g^-1)	Day	Becker	Crookston	Lamberton	Waseca	Rosemount (tilled)	Rosemount (non-tilled)	St. Paul (corn)	St. Paul (soybean)
0	0	7.24 ± 0.19^A	6.78 ± 0.03^A-K	6.77 ± 0.08^B-K	6.94 ± 0.01^A-I	7.04 ± 0.04^∗,A-F	7.09 ± 0.05^A-D	7.06 ± 0.03^A-F	7.09 ± 0.04^A-E
0	4	6.97 ± 0.21^A-I	6.83 ± 0.07^A-K	6.65 ± 0.07^C-K	6.94 ± 0.01^ABC	7.01 ± 0.04^A-F	6.96 ± 0.05^A-I	6.94 ± 0.08^A-I	6.98 ± 0.05^A-I
0	14	7.22 ± 0.06^AB	6.80 ± 0.06^A-K	6.85 ± 0.10^A-K	6.93^†,A-F	6.99 ± 0.05^A-H	6.98 ± 0.07^A-I	7.01 ± 0.00^A-F	6.97 ± 0.02^A-I
0	21	7.14 ± 0.01^A-I	6.80 ± 0.01^C-K	6.78 ± 0.07^A-K	6.87 ± 0.04^∗,A-I	7.07 ± 0.06^A-F	6.97 ± 0.05^A-F	6.93 ± 0.04^B-K	6.99 ± 0.03^A-F
100	4	7.00 ± 0.05^A-H	6.80 ± 0.01^A-K	6.69 ± 0.03^C-K	7.04 ± 0.10^A-F	6.89 ± 0.04^A-K	6.90 ± 0.08^A-J	6.89 ± 0.01^A-K	6.95 ± 0.03^A-I
100	14	7.03 ± 0.11^A-F	6.85 ± 0.01^A-K	6.69 ± 0.03^C-K	6.87 ± 0.01^A-I	6.98 ± 0.02^A-I	6.98 ± 0.03^A-I	6.91 ± 0.02^A-J	6.95 ± 0.04^∗,A-I
100	21	7.09 ± 0.06^A-I	6.77 ± 0.05^C-K	6.76 ± 0.08^A-K	6.94 ± 0.17^A-K	7.00 ± 0.06^A-G	6.91 ± 0.04^A-F	6.88 ± 0.01^C-K	6.96 ± 0.05^A-F
500	4	6.63 ± 0.07^A-K	6.78 ± 0.04^F-K	6.63 ± 0.04^C-K	6.87 ± 0.01^A-K	6.92 ± 0.03^A-J	6.97 ± 0.08^A-I	6.88 ± 0.09^D-K	6.96 ± 0.02^A-I
500	14	6.85 ± 0.14^B-K	6.55 ± 0.02^IJK	6.69 ± 0.06^E-K	6.81 ± 0.05^C-K	6.86 ± 0.02^A-K	6.89 ± 0.09^A-K	6.23 ± 0.08^G-K	6.92 ± 0.05^A-K
500	21	6.46 ± 0.11^C-K	6.10 ± 0.02^K	6.67 ± 0.07^H-K	6.77 ± 0.09^F-K	6.65 ± 0.30^C-K	6.88 ± 0.05^B-K	6.20 ± 0.07^JK	6.86 ± 0.06^B-K

^A-KSamples sharing the same superscript did not differ significantly by Tukey’s post hoc test (P > 0.05). ^∗Only two samples returned sufficient sequence reads for analysis. ^†Only one sample returned sufficient sequence reads for analysis.