สืบค้นงานวิจัย
Growth and Yield of New Generation Clones of Hevea in Sub-Himalayan West Bengal
G. Das - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Growth and Yield of New Generation Clones of Hevea in Sub-Himalayan West Bengal
ผู้แต่ง / หัวหน้าโครงการ (EN): G. Das
บทคัดย่อ (EN): Five rubber (Hevea brasiliensis) clones derived from crossing between RRII 105 and RRIC 100 along with five other clones viz. PB 217, RRII 176, RRII 203, RRII 105 and RRIM 600 were evaluated since 1996 in the Regional Experiment Station of Rubber Research Institute of India, Nagrakata, Jalpaiguri, West Bengal, India. All the recommended cultural practices were followed. Clonal variation was observed in all the parameters studied viz. girth at the opening of panel (1st tapping), girth at 16th year of planting, girth increment during immature and mature period, timber volume and biomass. Significantly high girth at the panel opening time was observed in RRII 429 and RRII 203 compared to the check clone RRIM 600; however, at 16th year girth of all the clones were either at par or inferior to the check. During immature phase girth increment of RRII 429, RRII 417 and RRII 422 and during mature period, girth increment of RRII 105 were superior to the check clone. Clear bole volume of RRII 203 was significantly higher than the check clone RRIM 600. The data on mean yield over nine years showed that only one clone ie. RRII 429 scored highest yield over the check clone. The superiority of RRII 429 on yield was reflected on the first and second virgin bark also. The pre-winter yield contribution of RRII 429 was similar to RRIM 600. The rest of the clones were either on par or lower to the check. Highest dry rubber content was found in RRII 417 compared to RRIM 600. The mean yield over seven years was considered as the more stable data because for the first two years, the percentage of tappability of all the clones had not reached upto 70% which is the recommended percentage of plants for initiating latex harvesting. The yield data over seven years showed that yield in RRII 417 and RRII 429 was higher than the check clone. The yield improvement of RRII 417, RRII 422 and RRII 429, over the check clone, was appreciable in the 1st and 2nd panels of virgin bark also. The monthly yield distribution of over months, the yield ten clones were divided into three groups viz. 400 series clones (average of yield of 400 series clones), other clones (average of yield of Wikham clones) and all clones (average of all ten clones). The data showed that from May till December, there was a gradual increase in yield in all the groups with an appreciable yield increase during pre-winter (October to December) period. However, the yield of 400 series clones was much higher than the other groups especially during pre-winter period indicting that clones of this group were well adapted with the winter temperature. The performance index of clones was calculated (Mydin and Mercykutty, 2007) considering different growth and yield parameters. For getting stable result, from 3rd to 9th year yield data was considered. The ranking on the basis of performance index showed that RRII 203 was the best performing clone followed by RRII 417 and RRII 429. The RRII 422 and RRII 430 opted 7th and 8th position. A simple linear correlation between yield and growth parameters in different categories viz. RRII 400 series category and all the 10 clones showed that in RRII 400 series, a significant correlation was observed between yield and girth at opening, girth at 12th year, clear bole volume, biomass and girth increment during immature phase. In the second set, however, clear bole volume was not correlated with rubber yield. This indicated that RRII 400 series clones in particular were better adapted to the agroclimate of the region and rubber yield increased concomitantly with growth, biomass and timber volume. Components of variance viz. genotypic and phenotypic variance, clonal repeatability over seasons and broad sense heritability were calculated. The clonal repeatability for yield was found to be 0.7 and broad sense heritability was 41.25 indicating better stability and heritability of the trait over seasons. For dry rubber content, a trait related to yield was not prominent indicating a low range of variation for the trait. For growth traits, the clonal repeatability estimates and broad sense heritability ranged from 0.16 to 0.38 and 14.7 to 27.60 respectively suggesting low response that could result from selection. From the lower percentage value of the broad sense heritability data it might be stated that phenotypic selection in terms of growth would not be effective. For yield, the estimated genotypic and phenotypic variance exhibited high value in comparison to the estimated error variance indicating higher genetic effects in its expression. The estimated genotypic and phenotypic coefficients of variance appeared to be small for girth, DRC and girth at opening of panel indicating that environmental effect (over season over years) were of great importance for these traits. Among the traits studied rubber yield is the one that can be improved by selection, as also reported earlier. This study on performance of new generation clones in Sub-Himalayan West-Bengal revealed that RRII 429 ranked first on the basis of girth, biomass and yield. The performance of RRII 417 and RRII 203 was also superior. Therefore, RRII 429, RRII 417 and RRII 203 would be the preferred clones for the region. These clones exhibited high rubber and timber yields. Heritability estimates showed prospects of improvement in rubber yield by selection.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): yield
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

การอ้างอิง

G. Das. "Growth and Yield of New Generation Clones of Hevea in Sub-Himalayan West Bengal". ไม่ระบุหน่วยงาน. ม.ป.ป.

G. Das. "Growth and Yield of New Generation Clones of Hevea in Sub-Himalayan West Bengal". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Growth and Yield of New Generation Clones of Hevea in Sub-Himalayan West Bengal
G. Das
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
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