Table 1 Phenology in 2017 and 2018.

From: Optimizing planting density and nitrogen application to enhance profit and nitrogen use of summer maize in Huanghuaihai region of China

N rate

Planting density

Tasselling (days)

Silking (days)

Physiological maturity (days)

2017

2018

2017

2018

2017

2018

N1

D1

47.0b

48.0cd

49.0c

50.0de

100.7d

101.3d

D2

47.0b

49.0b

49.0c

51.3bc

101.3bcd

102.7bc

D3

48.7a

49.7a

51.0a

52.7a

101.0cd

102.7bcd

N2

D1

47.0b

47.7d

49.0c

49.7ef

101.7abcd

101.3d

D2

47.3b

48.3c

49.7bc

50.3de

101.7abcd

102.3cd

D3

47.7b

49.0b

50.3ab

51.7b

102.7a

104.0ab

N3

D1

47.0b

47.0e

49.0c

49.0f

101.7abcd

102.0cd

D2

47.3b

48.0cd

49.7bc

50.7cd

102.0abc

103.3bc

D3

47.3b

48.3c

50.0b

51.3bc

102.3ab

105.0a

Significance

N rate (N)

ns

**

ns

***

ns

*

Density (D)

*

***

***

***

ns

***

  1. The three N rates are 120 (N1), 180 (N2), and 240 (N3) kg ha−1. The three planting density levels are 60,000 (D1), 75,000 (D2), and 90,000 (D3) plants ha−1.
  2. ns no significant difference.
  3. Means within a column followed by the different letter are not significantly different at P < 0.05 as determined by the LSD test.
  4. *, **, and *** indicate significant difference at 0.05, 0.01 and 0.001 level, respectively.
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