Agriculture Reference
In-Depth Information
(a)
10
9
8
7
6
5
4
3
2
0
Control 0u
50u at
sowing
100u at
sowing
Dose of nitrogen (u/ha)
50u +
50cm
100u +
50cm
Split
(b)
40
38
36
34
32
30
Control 0u
50u at
sowing
100u at
sowing
Dose of nitrogen (u/ha)
50u +
50cm
100u +
50cm
Split
(c)
18
16
14
12
10
8
6
4
2
0
Control 0u
50u at
sowing
100u at
sowing
Dose of nitrogen (u/ha)
50u +
50cm
100u +
50cm
Split
Fig. 5.14. Comparison of the effects of different nitrogen fertilization regimens on hurd yield (a), fibre
content (b) and seed yield (c) (FNPC, 2001, 2002; ITC, 2003 (FNPC)).
for longer before falling. Earlier harvests have a
much shorter period during which fibre content
remains constant. Harvests as early as the end of
July have next to no such period. These results
suggest that lignification of the stems renders
them more resistant to breakdown, although this
remains to be confirmed experimentally.
the variables that affected processing of fibre
from hemp stalks.
Different processing regimes were
scored according to the cleanliness of the
fibres, as indicated by the number of passes
through the rollers required to obtain the
lowest possible residual hurd content. The
quicker this level was reached (correspond-
ing to the lowest number of passes through
the milling/rolling process), the easier the
processing.
The variables explored so far are: (i) length
of retting; (ii) nitrogen fertilization; (iii) seeding
rate; (iv) date of harvest; and (v) variety.
5.4.8 Crop cultivation factors and
their influence on fibre processing
Between 1999 and 2002, the FNPC and Le
Chambre d'Agriculture de l'Eure investigated
 
 
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