Abstract
Linseed (Linum usitatissimum L.) and fi bre hemp (Cannabis sativa L.) can be used as raw materials in various applications. In this study, microbiological quality and meteorological measurements were made during the growing seasons and harvesting periods of 2001 and 2002. The microbiological analyses were carried out with Hygicult® TPC and Y&F dipslides, and with a surface spreading method using Plate Count and Potato Dextrose agars. During the growing season of 2001 the conditions were mostly humid, whereas the growing season of 2002 was rather dry and warmer than that of 2001. The lack of water during the growing season of 2002 affected the growth of the plants. In the case of both hemp and fl ax, the mould and bacterial contents (cfu gdw-1) increased markedly at the end of the growing season of 2001. During the growing season of 2002 the increase in mould and bacterial contents was noticeable but more constant throughout the whole growing season. At the end of the growing seasons, the mould and bacteria contents were higher in 2001 than in 2002. The genera of moulds identifi ed included Cladosporium, Fusarium, Penicillium, Mucor and Alternaria. The microbiological safety should be controlled during the whole production chain, beginning with the cultivation and harvesting periods.;
Highlights
Linseed (Linum usitatissimum L.) and fibre hemp (Cannabis sativa L.) can be used as raw materials in various applications
Hemp (Cannabis sativa L.) is an annual bast fibre plant ranging in height from 1.2 to 5 m and with a diameter from 4 to 20 mm
By comparing the dry weights of hemp in the years 2001 and 2002 it can be seen that the dry conditions during the growing season of 2002 affected the dry weight content of the matured stalk
Summary
Linseed (Linum usitatissimum L.) and fibre hemp (Cannabis sativa L.) can be used as raw materials in various applications. Microbiological quality and meteorological measurements were made during the growing seasons and harvesting periods of 2001 and 2002. The lack of water during the growing season of 2002 affected the growth of the plants. In the case of both hemp and flax, the mould and bacterial contents (cfu gdw-1) increased markedly at the end of the growing season of 2001. At the end of the growing seasons, the mould and bacteria contents were higher in 2001 than in 2002. During retting the components that bind the fibre bundles to the other plant tissues are broken down by the action of enzymes. In the dry-line method seeds are harvested in autumn and the rest of the plant is left in the field to be stand-retted and dried during the winter
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