文章摘要
Compositions of Latex and Properties of Raw Rubber for Yunyan 77-4 Rubber Trees Tapped during Winter and Dry Season
Received:October 10, 2024  Revised:October 10, 2024
DOI：10.12136/j.issn.1000-890X.2025.09.0666
Key Words: Yunyan 77-4 rubber tree；winter and dry season tapping；composition of latex；property of raw rubber
Author NameAffiliationE-mail
ZHANG Gui-mei Yunnan Key Laboratory of Sustainable Utilization Research on Rubber Tree/Yunnan Institute of Tropical Crops zgm1027@163.com 
XU Yingguang Hainan Academy of Inspection and Testing  
QI Long Yunnan Key Laboratory of Sustainable Utilization Research on Rubber Tree/Yunnan Institute of Tropical Crops  
KONG Zhen Meteorological Bureau of Xishuangbanna Prefecture  
YANG Yaowen Yunnan Key Laboratory of Sustainable Utilization Research on Rubber Tree/Yunnan Institute of Tropical Crops  
YANG Chunxia Yunnan Key Laboratory of Sustainable Utilization Research on Rubber Tree/Yunnan Institute of Tropical Crops  
LI Mingqian* Yunnan Key Laboratory of Sustainable Utilization Research on Rubber Tree/Yunnan Institute of Tropical Crops 123233907@qq.com 
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Abstract:
      Yunyan 77-4 rubber tree was fast-growing and cold resistant triploid clonal rubber tree variety，which was prone to exhibit obstacles of latex flow under high tempertures in the regular tapping reason of summer and autumn.Taking 10-year-old and 19-year-old Yunyan 77-4 rubber trees as objects，the two tapping methods of Ethephon stimulation and non Ethephon stimulation were adopted to study the compositions of latex and the properties of raw rubber tapped during the winter and dry season（September to April of the next year），and compared with latex and raw rubber tapped during the regular season.The results showed that，the dry rubber content of latex tapped during the winter and dry season decreased first and then increased with tapping time change，while the nitrogen and manganese contents of latex and ash content of raw rubber increased first and then decreased.Ethephon stimulation tapping could decrease the dry rubber content of latex，initial plasticity value（P0） and Mooney viscosity of raw rubber，but increase the nitrogen and copper contents of latex.The effect of tree age on the compositions of latex and properties of raw rubber was greater than those of Ethephon stimulation.The dry rubber content of latex and P0 and Mooney viscosity of raw rubber from 19-year-old trees were greater than those from 10-year-old trees.The compositions of latex and the properties of raw rubber tapped during the winter and dry season from the 19-year-old trees had relatively small viaration.For cold resistance triploid clonal rubber tree variety that was prone to exhibit obstacles of latex flow under higher temperatures，the winter and dry season tapping may become a new tapping method.
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