Level of fertilization (kgN/ha)

Ash

Crude proteins

F1

F2

F3

F4

Means

F1

F2

F3

F4

Means

0

10.61a

13.78a

13.79a

16.98a

13.79a

8.31a

13.18a

13.05a

10.87a

11.35a

100

12.51ab

13.32a

18.39ab

15.41a

14.9ab

13.08b

16.93b

15.67a

14.66b

15.10a

200

14.55b

18.34a

19.72b

16.94a

17.39b

13.71b

20.04b

19.77b

14.60b

817.02b

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