Factors Affecting the Yield of Industrial Hemp – Experimental Results from France - Hemp: Industrial Production and Uses - page 91

(a)

10

8

6

4

2

0

1992 1993 1994 1995 1996 1997 1998 1999 2001
Year

12-Sept 20-Sept

(b) 45

40

35

30

25

20

15

10

5

0

1992 1993 1994 1995 1996 1997 1998 1999 2001

Year

12-Sept 20-Sept

(c) 16

14

12

10

8

6

4

2

0

1992 1993 1994 1995 1996 1997 1998 1999 2001

Year

12-Sept 20-Sept

Fig. 5.18. Hurd yield (a), fibre content (b) and seed yield (c) of the intermediate variety, F34, harvested
on two different dates: 12 and 20 September (FNPC results, 1992-2001).

5.5.2 Weeding

trials will allow these observations to be con-
firmed. It was also possible to observe that seed
treatments did not improve hurd and seed yields
directly but permitted an improvement in germi-
native vigour, and therefore stand establishment.

The main weeds identified in hemp crops are
sinapis, chenopodiums, mercurials, linarias,
fallopias and poaceaes.