Nitrogen

(Kg∙N∙ha⁻¹)

Fresh biomass at harvest

Stem

Total (Stem + Leaves)

2014

2015

2014

2015

Mg∙ha⁻¹

0

40.4^c†

54.8^c

45.7^c

61.8^c

40

67.1^b

60.5^bc

73.3^b

67.0^bc

80

73.3^ab

70.0^a

79.7^ab

77.7^a

120

77.3^a

63.4^ab

84.7^a

71.6^ab

P-value

<0.0001

0.0054

<0.0001

0.0045

Linear

<0.0001

0.0045

<0.0001

0.0037

Quadratic

<0.0001

0.0399

<0.0001

0.0850

Cubic

0.0793

0.1555

0.0772

0.1454