สืบค้นงานวิจัย
Long-Term Yield and Growth Performance of IRCA Rubber Clones (Hevea Brasiliensis) in India
C.P. Reghu. - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Long-Term Yield and Growth Performance of IRCA Rubber Clones (Hevea Brasiliensis) in India
ผู้แต่ง / หัวหน้าโครงการ (EN): C.P. Reghu.
บทคัดย่อ (EN): As part of a bilateral clone exchange programme. India introduced five hybrid clones of Hevea brasiliensis in 1991 from the Institut de Recherches sur le Caoutchouc (IRCA), Cote d’Ivoire. The field trial comprising of these cones and a popular India clone RRII 105 was laid out during 1992 in a randomized block design with five replications and a plot size of eight plants. The trial is located at the Central Experiment Station, Chethackal, Rubber Research Institute of India, Kerala state. The trial was opened for regular tapping during 2001 at the age of nine years and the growth performance and monthly dry rubber yield trend were evaluated. The characters studied were (i) girth (cm) of the tree at 150 cm height from the bud union, every year from the fourth year of growth (ii) mean girth increment (cm) before the commencement of tapping and during A and B panel tapping, (iii) mean dry rubber yield (g/t/t) for a period of ten tapping years, (iv) plugging index (PI), (v) mean dry rubber content (DRC%), (vi) bole height (m), and (vii) clear bole volume (m3) at the age of 19 years. Significant clonal differences were observed for all the seven characters except girth increment. At the time of opening, IRCA 111 and IRCA 130 were superior (55.5 and 55.3 cm respectively) to all other clones in terms of vigour, while the remaining 3 IRCA clones were on par (50.8 to 53.0 cm) with RRII 105, which was the least vigorous (49.3 cm). IRCA 111 and RICA 130 maintained their superiority over the next 10 years of tapping too. By the 10th year of tapping, RRII 105 (69.8 cm) was on par with IRCA 130 (75.9 cm), while IRCA 111 continued to show the highest girth (77.3 cm). Clonal differences for girth increment (GI) were not significant over the 5-year period prior to commencement of tapping, or over the next five years (A panel). However, the average GI (cm/year) for the five clones before tapping commenced was much higher (6.1 cm/year) than that after commencement of tapping (2.1 cm/year in the A panel and 1.48 cm/year in the B panel). In the B panel however, girth increment rates of the six clones became significantly different (Pd”0.05), Over 10 years of tapping, IRCA 111 and IRCA 130 showed a growth of 2.17 and 2.07 cm/year respectively, following by RRII 105 with 1.88 cm/year. Clonal differences for yield were highly significant every year (Pd”0.01). In the first year after opening the trees for tapping, clone IRCA 130 had highest yield (52.0 g/t/t) followed by IRCA 111 and IRCA 18 (47.2 and 39.7 g/t/t), while the check clone RRII 105 recorded 36.2 g/t/t, Mean yield over ten years was highest in the clone IRCA 130 (76.0 g/t/t) followed by IRCA 111 (55.9 g/t/t) and RRII 105 (56.8 g/t/t) Yield components such as plugging index (PI) and dry rubber content (DRC%) was recorded in the 17th year of growth. Lowest PI was recorded in the clone IRCA 130 and IRCA 111. In the case of % DRC, the clones IRCA 109, IRCA 230, IRCA 18 AND IRCA 111 are in the order. Higher bole height was recorded in IRCA 130 (6.88 m), IRCA 109 (5.97 m) and IRCA 111 (5.93 m), With regard to timber volume. IRCA 130 (0.24 m3) remain in the top followed by IRCA 111 (0.20 m3), IRCA 109 (0.16 m3) and IRCA 18 (0.16 m3). These four cones had significantly higher bole volume than that of RRII 105. Two clones (IRCA 130 and IRCA 111) with good dry rubber yield and timber yield can be considered as potential latex-timber clones.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): growth
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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C.P. Reghu.. "Long-Term Yield and Growth Performance of IRCA Rubber Clones (Hevea Brasiliensis) in India". ไม่ระบุหน่วยงาน. ม.ป.ป.

C.P. Reghu.. "Long-Term Yield and Growth Performance of IRCA Rubber Clones (Hevea Brasiliensis) in India". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Long-Term Yield and Growth Performance of IRCA Rubber Clones (Hevea Brasiliensis) in India
C.P. Reghu.
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
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