Circumference classes (cm)		Pf (Kg DM/ha)
[10-20]	min	1.45
[10-20]	max	3.95
[20-30]	min	4.31
[20-30]	max	6.61
[30-40]	min	9.75
[30-40]	max	13.02
[40-50]	min	7.02
[40-50]	max	8.74
[50-60]	min	13.40
[50-60]	max	15.98
[60-70]	min	14.91
[60-70]	max	17.27
[70-80]	min	8.77
[70-80]	max	9.95
[80-90]	min	8.25
[80-90]	max	9.21
[90-100]	min	11.91
[90-100]	max	13.14
[100-150]	min	36.38
[100-150]	max	54.80
> 150	min	28.22
> 150	max	58.77