3.Results
Field experiments
The precipitation during late summer and autumn 1997 was
unusally low (Fig. 1). Especially August and September
were comparatively dry with 41.8 and 70.9 mm rain per
month. The temperature was in the mean range.
Figure 1 Mean daily temperature and precipitation of
the trial location during harvest time
Harvest time experiment
Figure 2 shows the amount essential oils in relation to
the harvest time, expressed in l/ha. Yields of all four
strains have been more or less continously increasing up
to a maximum value at the stage when about 50% of the
seeds had reached maturity. In October during senescence
the yields decreased.
Figure 2 Essential oil yield of hemp depending on
harvest time
The pattern of essential oil quality, depending on the
harvest time, was different. In our classification the
best quality of the strains Kompolti, Futura 77 and
Félina 34 was allways obtained before the highest yields
were reached (Fig. 3). In the case of Kompolti and Futura
77 qualitiy was highest 4 days earlier the yield maximum
was reached. The best quality of essential oil from the
strain Félina 34 was gained 17 days before the highest
quantity. At the stage of the highest yield the quality
was moderate (for Kompolti and Futura 77) or even bad
(Félina 34).
Figure 3 Quality of the essential oil of hemp
depending on the harvest date
The results of the chemical analysis showed no
significant relationship between any detected compound
and the relative quality marks or the harvest dates.
Table 2 gives an example of the chemical composition of
the essential oil of the strain Kompolti depending on the
harvest date.
Table 2 Chemical composition of essential oils of the
strain Kompolti depending on harvest date
Figure 4 summarises the course of the mean values of
yield and quality of all strains in time.
Figure 4 Yield and quality rating of essential oil of
hemp (mean yield values of Kompolti, Félina 34, Futura
77
and Swissmix and mean quality ratings of Kompolti,
Félina 34 and Futura 77)
Seed density experiment
In all three tested strains the seed density of 5 kg/ha
lead to significant higher bud yields compared with
sowing densities of 2, 10, 30 and 60 kg/ha (Fig. 5). At
harvest time the sowing density of 5 kg/ha showed a plant
density of about 15 plants per square metre.
Figure 5 Bud yields of hemp depending on seed density
Greenhouse experiment
The yields of essential oils gained from non-pollinated
plants were more then twice higher than of pollinated
ones (Tab. 3). The scent tests did not result in a
significant difference between the two different oil
types. On a ordinale ranking scale from bad to excellent
all tested oils from Kompolti were rated „very
good“ or even „excellent“. The scent of
oils from non-pollinated plants was judged as being more
intensive and more powerful. The scent originating from
pollinated plants seemed to be more of a typical
"hemp odour".
Table 3 Essential oil yields from pollinated and
non-pollinated plants (Kompolti)
Titel
Abstract
1.Introduction
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2.Material&Methods | 4.Discussion | 5.Conclusions
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6.References | 7.Acknowledgements
Contact
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