สืบค้นงานวิจัย
Are the Recently Introduced Chemical Formulae to Cure of Tapping Panel Dryness of Rubber Effective?
A.M.W.K. Denevirathna - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Are the Recently Introduced Chemical Formulae to Cure of Tapping Panel Dryness of Rubber Effective?
ผู้แต่ง / หัวหน้าโครงการ (EN): A.M.W.K. Denevirathna
บทคัดย่อ (EN): Some chemical formulae namely Siva’s formulation (SF), Vitex, Vitex-Plus, Mortex etc. have recently been introduced to rubber plantations in all over rubber growing countries to maximize latex production in TPD affected trees through curing dryness and also to enhance the latex production in non-TPD trees as well. Several experiments were conducted by the Rubber Research Institute of Sri Lanka for last few years to assess the effectiveness of these chemicals mainly as treatments for TPD of some Sri Lankan clones. For experiments, samples of fully dry (>90% cut length dry), partial dry (50-75% cut length dry) and healthy trees were selected from RRIC 100 and RRIC 121 fields which were being tapped on B0-2 panel at S/2d2 intensity. Selected trees were tapped for about two weeks prior to treatments and pretreatment yield (grams per tree per tapping – g/t/t) was calculated. Chemical treatments were done after that. Vitex-Plus was treated at 2.5g per tree at 10 day intervals for initial six applications and thereafter 1g at 10 days afterwards up to 23 rounds of application. Siva’s formulation (SF) was treated at 1g per tree at 10 day intervals for first three months and third three months while keeping the second three months without treating. Vitex was applied at 1g per tree at 6 day and 10 day intervals for TPD and healthy trees, respectively. Whilst, both healthy and TPD trees were treated with Mortex 25 at once a month and 10 day intervals, respectively. Effectiveness of Vitex, Vitex-Plus and Mortex were compared with a treatment of 2.5% Ethephon-Plus 1.6g at quarterly and 1g at 10 day and 6 day intervals where necessary. Daily latex volume and DRC were measured for each treatment and for healthy trees throughout the experimental period and the yield per tree per tapping was calculated. Yield of SF treated TPD trees (14.2g/t/t) was comparable with that of non-treated TPD trees (14.4 g/t/t/) but lower than the yield of healthy trees (35 g/t/t) after 3 months of application. However, the yields of treated and non-treated TPD trees were gradually decreased to 4.2 and 9.2 g/t/t, respectively after 9 months. Application of Vitex-Plus to both fully and partial dry trees showed an increased yield during first 6-7 applications and then gradually decreased to uneconomical levels towards a year of application. Application of Ethephon-Plus at 1.6g quarterly showed 42% less yield in fully dry treated trees compared to the non-treated fully dry trees; however partial dry trees revealed a 21% yield increase over the non-treated partial dry trees. On healthy trees, 45 and 9% yield increase, respectively due to Ethephon-Plus and Vitex-Plus were observed. Results of the experiment conducted using Vitex, Ethephon-Plus and Mortex on both healthy and TPD trees showed 25.9, 33, 23.6 g/t/t, respectively in Vitex, Ethephon-Plus and Mortex treated healthy trees over the non-treated healthy trees (21 g/t/t) after three months. Similar response, but with lower yield: 5.1, 7.6, 6.7 g/t/t, respectively in Vitex, Ethephon-Plus and Mortex treated TPD trees over the non-treated TPD trees (1.1 g/t/t) was observed for the same period. However, results after 14 months of the experiment showed 37.2 and 42.8 g/t/t in Vitex and Ethephon-Plus healthy trees over the non-treated healthy trees (37.9 g/t/t); and 3.6 and 4.9 g/t/t respectively in Vitex and Ethephon-Plus treated TPD trees over the non-treated TPD trees (1.4 g/t/t) for the same period. Although several chemical formulae were introduced to cure TPD, the objective was not achieved so far as expected. And also the application of these chemicals is not economically effective to sustain the productivity of TPD or low yielding rubber trees.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): chemical formulae
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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A.M.W.K. Denevirathna. "Are the Recently Introduced Chemical Formulae to Cure of Tapping Panel Dryness of Rubber Effective?". ไม่ระบุหน่วยงาน. ม.ป.ป.

A.M.W.K. Denevirathna. "Are the Recently Introduced Chemical Formulae to Cure of Tapping Panel Dryness of Rubber Effective?". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Are the Recently Introduced Chemical Formulae to Cure of Tapping Panel Dryness of Rubber Effective?
A.M.W.K. Denevirathna
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
Inheritance of Tapping Panel Dryness (TPD) in a Full-Sib Population of Hevea brasiliensis POTENTIAL OF INCREASING THE PLANTING DENSITY OF RUBBER IN SRI LANKA STUDY ON THE POTENCY OF SERRATIA BACTERIA USED TO CONTROL WHITE ROOT DISEASE IN RUBBER Rubber Particles Proteins and Sensitivity to the Tapping Panel Dryness at Hevea brasiliensis THE “DOUBLE CUT ALTERNATIVE” (DCA) TAPPING SYSTEM: AN INNOVATIVE TAPPING SYSTEM DESIGNED FOR THAI RUBBER SMALLHOLDINGS USING HIGH TAPPING FREQUENCY RESULTS AFTER TEN YEARS OF TAPPING Influence of age and girth at opening on rubber yield, biochemical and tapping panel dryness parameters of Hevea brasiliensis in determining tapping norms The Role of Myanmar Rubber Planters and Producers Association (MRPPA) in Natural Rubber Development and its Recent Activities THE SITUATION OF TAPPING PANEL DRYNESS IN UPPER NORTHEAST OF THAILAND Incidence of Tapping Panel Dryness in North-East India IDENTIFICATION OF SUITABLE SPECIES AND GENOTYPES FOR CUT FOLIAGE CULTUVATION ON RUBBER LANDS
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