Table 2 N2O cumulative emission and its influencing factors.

From: Response of soil N2O emission and nitrogen utilization to organic matter in the wheat and maize rotation system

Crop

Treatmenta

Cumulative emission (kg ha−1)

EF (%)

Correlation with temperature (°C)

Correlation with moisture (%)

Winter wheat

CK

0.55d

–

0.153

0.436**

FN

2.08a

0.34a

0.094

0.534**

RN

1.47b

0.26ab

0.125

0.576**

HAN

1.11c

0.16b

0.103

0.541**

RN40% + HOM

0.95c

0.18b

0.035

0.496**

Summer maize

CK

0.75e

–

0.332

0.561**

FN

3.21a

0.40a

0.206

0.515**

RN

2.38b

0.35b

0.186

0.524**

HAN

1.76c

0.21c

0.2

0.499**

RN40% + HOM

1.32d

0.14d

0.269

0.373*

Rotation

CK

1.30e

–

0.292**

0.535**

FN

5.29a

0.38a

0.285**

0.537**

RN

3.85b

0.31b

0.272*

0.537**

HAN

2.87c

0.19c

0.273*

0.506**

RN40% + HOM

2.27d

0.15c

0.242*

0.449**

  1. aTreatment: CK (zero N), FN (farmers’ traditional inorganic N rate),RN (recommended inorganic-N rate), HAN (zinc and humic acid urea), RN40% + HOM (40% inorganic N rate of RN with homemade organic matters). Different letters in the same column within the same crop and rotation system represent significant differences of mean values at the P < 0.05 level. * and ** indicate significant correlations at 0.05 and 0.01 level, respectively (n = 82).
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