Nitrous oxide emissions and maize yield as influenced by nitrogen fertilization and tillage operations in upland soil

Applied Biological Chemistry

Table 9 Grain yield amended with different tillage operations (T), nitrogen fertilizations (N), and years (Y)

Year	Year 1			Year 2			Y mean¹
Tillage operations	CT	NT	N mean	CT	NT	N mean	CT	NT	T × Y mean²
Nitrogen fertilizations				Grain yield (Mg ha⁻¹)
WOU	3.93^b (0.86)	6.02^a (0.56)	4.97^A (0.62)	2.85^a (0.22)	1.50^b (0.04)	2.17^B (0.28)	3.39^a (0.46)	3.76^a (0.89)	3.57^B (0.42)
WU	5.41^a (1.01)	5.96^a (0.49)	5.68^A (0.56)	6.63^a (0.20)	4.87^b (0.67)	5.75^A (0.47)	6.02^a (0.56)	5.41^a (0.44)	5.72^A (0.57)
N mean³⁾	4.67^a (0.70)	5.99^a (0.35)		4.74^a (0.73)	3.18^b (0.71)		4.70^a (0.45)	4.59^a (0.57)
T × N mean⁴⁾	5.33^a (0.41)			3.96^b (0.53)

Standard error in brackets. Different lower- and upper-case letters denote significant differences at p < 0.05 in column and row comparisons, respectively
¹Y mean: mean value across years
²T × Y: mean value across tillage operations and years
³N mean: man value across N fertilizations
⁴T × N: mean value across tillage operations and N fertilizations