شماره مطلب: 418

Agronomy of fibre hemp (Cannabis sati6a L.) in Europe

نویسنده: 
P.C. Struik
انتشارات: 
elsevier
تعدات صفحات: 
12
Fibre hemp may yield up to 25 t above ground dry matter per hectare (20 t stem dry matter ha1) which maycontain as much as 12 t ha1 cellulose, depending on environmental conditions and agronomy. Its performance isaffected by the onset of flowering and seed development. Effects of cultivar and management on yield and qualitywere tested at three contrasting sites in Italy, the Netherlands and the UK in three years, making use of standardisedprotocols for experimental design and research methodology. Highest yields (up to 22.5 t dry matter ha1) wereobtained in Italy when later cultivars were used. Attainable yields proved slightly lower in the Netherlands and muchlower in the UK. The quality of the cellulose was relatively stable over the growing season, but lignification mayproceed rapidly some time after flowering. Crop development was very rapid and crops maintained green leaf area fora long time, thus radiation interception was considerable. The radiation use efficiency changed during development.It was lower after flowering (about 1.0 g MJ1 PAR) than before (about 2.2 g MJ1 PAR). Growing earlier cultivarsto obtain some seed set advanced the reduction in radiation use efficiency. Nitrogen proved to affect yield onlyslightly. A relatively small amount of fertiliser will be adequate to cover the crop’s needs. Plant density declinedduring growth in a site-specific manner when it was high initially. Very low plant densities may not show thisself-thinning but reduced yield and (especially) quality. Final plant densities were proven to depend more on initialplant stands than expected from literature. This was true at all three contrasting sites and in the different years.Nitrogen and plant density hardly interacted within one site. Results suggest that hemp can yield large quantities ofuseful cellulose when ecologically adapted cultivars are sown in proper plant densities. The cultivation is environmentallyfriendly with little harmful accumulation or emission of chemical inputs. More research on ideotyping is requiredand breeding efforts should be broadened. © 2000 Elsevier Science B.V. All rights reserved.
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