สืบค้นงานวิจัย
SUSTANINED HIGH YIELDS OVER THE LONG TERM IN CLONES INTRODUCED TO INDIA FROM MALYSIA AND THAILAND
T. Meenakumari - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): SUSTANINED HIGH YIELDS OVER THE LONG TERM IN CLONES INTRODUCED TO INDIA FROM MALYSIA AND THAILAND
ผู้แต่ง / หัวหน้าโครงการ (EN): T. Meenakumari
บทคัดย่อ (EN): The preponderance of small growers in the rubber sector in India and their enthusiasm to adopt the indigenously developed high yielding clone RRII 105, has led the country to the forefront in terms of highest productivity of natural rubber among all major producers. Today, Hevea breeders are in the pursuit of identifying high yielding clones performing better than RRII 105, in which introduction of exotic clones and their evaluation play a major role, apart from those that are developed within the country. Evaluation of introduced clones has the advantage of surpassing the preliminary trials in the breeding cycle as they have already proven their merit in the respective countries. The present study was conducted in a set of 13 clones comprising nine Prang Besar Estate (PB) clones introduced from Malaysia and three from Kohong Rubber Estate (KRS) Thailand, along with RRII 105 as control. These clones were planted in a large scale trial employing randomized block design with five replications and seven trees per plot at the research farm of the Rubber Research Institute of India, Kottayam. The trees were opened for tapping during the 7th year after planting. The tapping system followed was S/2 d3 6d/7. Yield recording was done at fortnightly intervals by cup coagulation method and mean annual dry rubber yield was computed for a period of 14 years of tapping. The final report on the long term performance of clones with respect to growth vigour, yield and tolerance to diseases is presented. Highly significant clonal variation was observed for annual mean dry rubber yield in the three panels. Most of the PB clones showed yield performance better than/on par with RRII 105. Among the Thailand clones KRS 163 was the high yielder. In the BO-1 panel, eight clones recorded significantly superior yield than RRII 105 (52.02 g/t/t). among these PB 314 (79.72 g/t/t), PB 255 (74.89 g/t/t), PB 312 (64.14 G/T/T) and PB 280 (67 G/T/T) were the top yielders with 53 to 28 percent yield improvement over RRII 105. Of the three Thailand clones, KRS 163 was the best performer with 60 g/t/t. in the BO-2 panel, RRII 105 recorded 55.50 g/t/t. Six clones viz., PB 235, PB255, PB 280, PB 312, PB 314 and KRS 163 recorded significantly superior yield than RRII 105, the yield levels ranging from 80 g/t/t (PB 255) to 70.67 (g/t/t) (KRS 163). The high yielders in the virgin panel continued to maintain superior yield performance in the renewed panel B1.1 also. Summarization of mean yield over 14 years revealed that seven clones including six PB clones and one Thailand clone out performed RRII 105. PB 255 was the highest yielder with 80 g/t/t followed by PB 280 (71.72 g/t/t) and PB 314 (70 g/t/t). PB 255 and, PB 280 showed a rising yield trend whereas PB 312 and PB 314 exhibited a declining yield trend in the renewed panel. Simultaneous selection for yield and stability based on long term performance showed overall rating for the clone PB 280 followed by PB 255. More over, most of the clones maintained a high growth rate after tapping as observed in the growth curve plotted over 19 years of planting. The high yielding clones PB 280, PB 314, PB 255 and PB 312 were assessed for their reaction to three major diseases viz. abnormal leaf fall, powdery mildew, and pink disease in comparison to RRII 105. The incidence of pink and powdery mildew was lower than RRII 105 whereas leaf retention under Phytophthora infection was poor compared to that of RRII 105. Estimates of genetic parameters and correlations for yield and yield components were worked out and discussed. Heritability for rubber yield was comparatively high. The performance of potential PB clones identified from the present study in comparison with that from other evaluations in various locations ins suggested for identifying clone(s) for release.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): high yield
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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T. Meenakumari. "SUSTANINED HIGH YIELDS OVER THE LONG TERM IN CLONES INTRODUCED TO INDIA FROM MALYSIA AND THAILAND". ไม่ระบุหน่วยงาน. ม.ป.ป.

T. Meenakumari. "SUSTANINED HIGH YIELDS OVER THE LONG TERM IN CLONES INTRODUCED TO INDIA FROM MALYSIA AND THAILAND". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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SUSTANINED HIGH YIELDS OVER THE LONG TERM IN CLONES INTRODUCED TO INDIA FROM MALYSIA AND THAILAND
T. Meenakumari
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
Performance of Selected Exotic and Indigenous Rubber (Hevea brasiliensis) Clones in Traditional Region of Kerala, India Effect of Panel Changing on Long Term Yield Response of Hevea brasiliensis (clone RRII 105) under Different Frequencies of Tapping and Stimulation Some Considerations Concerning the Yield Potential of Some Clones (Hevea brasiliensis) Identification of Resistance of Hevea brasiliensis Clones to Corynespora Leaf Fall Disease Promising latex timber clones of Hevea brasiliensis evolved by ortet selection Evaluation of some clones (Hevea brasiliensis) in a small scale trial in the southern part of Guatemala Recombination Breeding of Hevea brasiliensis in India: Clones Evolved From the 1983 Hybridization Programme Early Performance of some Clones of Hevea brasiliensis In Dry Sub humid Region of North Konkan Studies on Cold Tolerance of Hevea brasiliensis (Muell. Arg.) Clones under Controlled Environmental Conditions Evaluation of Rubber (Hevea brasiliensis) Modern Clones under Certain Stressful Climatic Conditions of Odisha
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