. 2018 Mar 22;9:385. doi: 10.3389/fpls.2018.00385

Table 2.

Cumulative NH₃ volatilization (g m^-2) at different stages of N application under different treatments.

Treatments	2013					2014
	Basal	Tillering	Jointing	Earing	Total	Basal	Tillering	Jointing	Earing	Total
N0	0.33 ± 0.05	0.45 ± 0.09	0.11 ± 0.01	0.10 ± 0.01	0.99 ± 0.10	1.32 ± 0.15	0.38 ± 0.06	0.25 ± 0.02	0.13 ± 0.02	2.08 ± 0.15
IF	2.81 ± 0.28	0.92 ± 0.12	0.22 ± 0.07	0.19 ± 0.06	4.14 ± 0.33	3.34 ± 0.30	1.18 ± 0.13	0.48 ± 0.05	0.17 ± 0.04	5.16 ± 0.32
OF	1.09 ± 0.10	0.62 ± 0.03	0.25 ± 0.09	0.15 ± 0.05	2.11 ± 0.15	2.58 ± 0.38	0.45 ± 0.08	0.32 ± 0.09	0.14 ± 0.02	3.49 ± 0.33
NFIF	2.19 ± 0.13	0.79 ± 0.07	0.22 ± 0.06	0.17 ± 0.04	3.38 ± 0.18	2.74 ± 0.29	1.06 ± 0.06	0.37 ± 0.04	0.16 ± 0.01	4.33 ± 0.22
SRIF	1.27 ± 0.07	0.62 ± 0.13	0.15 ± 0.02	0.16 ± 0.05	2.20 ± 0.13	2.23 ± 0.31	1.00 ± 0.11	0.46 ± 0.14	0.16 ± 0.04	3.86 ± 0.32
NT	1.61 ± 0.97	0.65 ± 0.23	0.19 ± 0.06	0.37 ± 0.06	0.15 ± 1.24	2.60 ± 0.77	0.78 ± 0.36	0.36 ± 0.09	0.15 ± 0.03	3.89 ± 1.16
CT	1.47 ± 0.85	0.71 ± 0.14	0.19 ± 0.09	0.41 ± 0.05	0.16 ± 1.05	2.28 ± 0.67	0.85 ± 0.34	0.40 ± 0.13	0.16 ± 0.03	3.69 ± 0.32
F-value
N source	446.55^∗∗	28.98^∗∗	4.76^∗∗	3.23^∗	355.26^∗∗	58.34^∗∗	97.10^∗∗	7.87^∗∗	2.26^ns	112.22^∗∗
Tillage practice	12.25^∗∗	3.62^ns	0.10^ns	0.70^ns	1.31^ns	14.04^∗∗	4.76^∗	1.81^ns	1.78^ns	4.30^ns
N source × Tillage practice	3.18^∗	2.59^ns	0.40^ns	0.83^ns	4.03^∗	0.95^ns	0.31^ns	0.12^ns	0.70^ns	0.91^ns

Different letters between N fertilizer treatments under the same tillage practice indicate significant differences at the 5% level. N0, no N fertilizer; IF, inorganic N fertilizer; OF, organic N fertilizer; SRIF, slow-release N fertilizer combined with inorganic N fertilizer; OFIF, organic N fertilizer combined with inorganic N fertilizer; NT, no-tillage; CT, conventional intensive tillage. “^∗” and “^∗∗” mean P < 0.05 and P < 0.01, respectively; ns, not significant.