Research on improvement of retting and extraction of roselle, kenaf and jute fibre
1998
Srisuda Thippayarugs | Chalaem Martwanna | Thongpoon Paenghakit | Woothisak Boothanoo | Chairoj Wongwiwatchi (Department of Agriculture, Bangkok (Thailand). Khon Kaen Field Crops Research Centre)
Research on improvement of retting and extraction of roselle, kenaf and jute fibre was grouped into three topics; 1) survey on farm practices, 2) study on major factors that affect retting and extraction process, and 3) development of small retting ponds. Farm practices on retting of fibre crops were found in ditch along roadside, in rice field, in farm pond and in natural water resources. These ponds contained 10*[4)-10*[5) colonies of microorganisms per one millilitre of water. Retting in farm pond water took shorter duration (5-6 days) than in rainfall or underground water. Optimum retting temperature ranged between 30-40 deg C with the optimum pH of 4-6. Major microorganisms for retting process were released from crop stem. Fresh bark retting shortened retting duration as same as application of urea at the rate of 0.01 percent of fresh stem weight. However, retting duration and water ratio greatly depended on crop species and varieties. Repeat retting in the same pond decreased fibre quality. Fibre quality improvement was obtained when extracted fibre was washed in clean water. N deficiency plant resulted in delayed retting process or even not completed the process but stayed green and rooting. A rectangular pond of 36 square m was sufficient for retting of one rai crop. Recommended retting was fresh bark retting with application of urea 0.01 percent and covering with water-hyacinth.
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