Table 1 Total N content and nitrogen use efficiency under different treatments in 2019 and 2020

2019

CK

113.20 ± 2.14f

/

/

/

/

A0

200.25 ± 1.24d

44.64 ± 0.47d

14.45 ± 0.83c

32.37 ± 1.26c

52.54 ± 0.26d

A2

204.23 ± 0.65c

46.68 ± 0.41c

15.86 ± 0.09c

33.98 ± 0.46bc

53.95 ± 0.13c

A3

186.89 ± 0.85e

37.79 ± 0.40e

12.84 ± 0.16d

33.97 ± 0.28b

50.92 ± 0.20d

IA2

210.58 ± 2.32b

49.93 ± 0.71b

17.02 ± 1.02b

34.09 ± 0.90c

55.11 ± 0.80b

IA3

217.86 ± 0.59a

53.67 ± 0.80a

20.77 ± 0.41a

38.71 ± 0.42a

58.86 ± 1.30a

IA4

203.50 ± 3.11 cd

46.31 ± 1.30 cd

15.48 ± 0.97bc

33.42 ± 1.38bc

53.56 ± 0.62c

2020

CK

104.79 ± 2.51f

/

/

/

/

A0

180.41 ± 1.87d

38.78 ± 0.54d

12.94 ± 0.86c

33.36 ± 0.49c

45.90 ± 0.31d

A2

186.51 ± 2.34bc

41.91 ± 1.15bc

15.40 ± 0.36b

36.75 ± 1.78b

48.36 ± 0.47b

A3

169.39 ± 1.24e

33.13 ± 0.70e

12.27 ± 0.48c

37.04 ± 1.74b

45.23 ± 0.17e

IA2

190.18 ± 2.04b

43.79 ± 0.78b

15.50 ± 1.28b

35.40 ± 0.31b

48.46 ± 0.57b

IA3

197.64 ± 2.39a

47.61 ± 0.12a

19.53 ± 0.93a

41.01 ± 0.42a

52.49 ± 0.42a

IA4

183.66 ± 2.06 cd

40.45 ± 0.32c

14.36 ± 1.35b

35.50 ± 0.58b

47.32 ± 0.23c

Year

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*

ns

**

Treatment

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**

**

**

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Year * Treatment

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*

*