Level of fertilization (kgN/ha)

Ash

Crude proteins

F₁

F₂

F₃

F₄

Means

F₁

F₂

F₃

F₄

Means

0

10.61^a

13.78^a

13.79^a

16.98^a

13.79^a

8.31^a

13.18^a

13.05^a

10.87^a

11.35^a

100

12.51^ab

13.32^a

18.39^ab

15.41^a

14.9^ab

13.08^b

16.93^b

15.67^a

14.66^b

15.10^a

200

14.55^b

18.34^a

19.72^b

16.94^a

17.39^b

13.71^b

20.04^b

19.77^b

14.60^b

817.02^b

SEM

0.63

1.38

0.85

0.74

0.83

0.23

1.01

1.02

0.70

0.75

p

0.017

0.137

0.039

0.656

0.022

0.001

0.005

0.008

0.016

0.001