Agriculture Reference
In-Depth Information
•
ensure a constant supply, maintaining
Fields sown for hemp stock seed are sown
at a very low density, of the order of 1.2 kg of
seed/ha. This yields an average harvest of
1.25 t seed/ha (an increase of ×1000). In addi-
tion to this multiplication factor, the low sow-
ing density also allows the fields to be inspected
and the crop further refined manually by culling
in order to obtain optimal quality.
Refinement consists of the:
removal of plants that do not conform to
both quantity and quality.
Different production schemes exist for hemp.
They are adapted to the variety used and the
qualitative objectives being sought.
Multiplication of varieties
The multiplication of certified monoecious
hemp seed (Fig. 4.16) has a distinct advantage:
the multiplication factor improves with each
generation and allows the industry to be
supplied by a small number of seed-producing
crop cycles.
•
the variety at the vegetation stage
elimination of male plants (residual dioe-
•
cious) at the flowering stage to remove
their gametes, which would effect a rapid
return to the dioecious state
SEED PRODUCTION OF
MONOECIOUS VARIETIES
Monoecious plants
seed selection
work: manual removal of
residual male plants and any
undesirable monoecious plants
subsequent tests:
male purity (2 - 3 years)
THC content (control)
degree of monoecy
variety purity
monoecious plants
seed pre-stock
work: manual removal of
residual male plants and any
undesirable monoecious plants
subsequent tests:
male purity (2 - 3 years)
THC content (control)
degree of monoecy
variety purity
monoecious plants
seed stock
work: manual removal of
residual male plants and any
undesirable monoecious plants
subsequent tests:
male purity (2 - 3 years)
THC content (control)
degree of monoecy
variety purity
commercial seed
monoecious variety
work: manual removal of
residual male plants
subsequent tests:
male purity (2 - 3 years)
THC content (control)
Fig. 4.16.
Organization of the production of monoecious seed stock.
