Clonal nursery evaluation of newly selected ortets of Hevea in Meghalaya
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TextPublication details: PLACROSYM XXII. 22nd Biennial Symposium on Plantation Crops: Leveraging Innovation System in Plantation Sector Through Value Addition, 15-17 December 2016, Indian Council of Agricultural Research-Central Plantation Crops Research Institute, Kasaragod, India. Abstracts. p. 56.Subject(s): Summary: Eleven ortet selections belonging to the states of Assam, Tripura and Meghalaya were evaluated for growth parameters and dry rubber yield in a clonal nursery trial with RRIM 600 as a check. The poly-bag plants were planted in the field at a row to row spacing of 3m x 3m and plant to plant spacing of 1.5 m in the Randomised Block Design (RBD) replicated thrice with 6 plants per plot. Observations on the growth parameters were recorded one year after planting and continued up to 5 years of crop growth. Three years after planting, test tapping was initiated and continued upto fourth and fifth year. The plants were test tapped ten times to obtain the dry rubber yield of the individual clones. On the basis of the continues 3 years of test tappings, the clone RRST 37 attained the highest girth (30.3 cm) and yield (71.7 g/t/10tap) followed by RRSG x 9 (66.0 g/t/10tap) and RRSA 121 (57.2 g/t/10 tap) where as the check clone RRIM 600 yielded 44.4 g/t/10 tap. In case of girth increment RRST 24 attained highest girth increment of 24 cm over a period of 5 years followed by RRST 37 (22 cm) and RRST 30 (21.5 cm) whereas the check clone RRIM 600 achieved the girth increment of 21.2 cm. This experiment suggests the scope for preliminary evaluation of clones in a nursery.
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Eleven ortet selections belonging to the states of Assam, Tripura and Meghalaya were evaluated for growth parameters and dry rubber yield in a clonal nursery trial with RRIM 600 as a check. The poly-bag plants were planted in the field at a row to row spacing of 3m x 3m and plant to plant spacing of 1.5 m in the Randomised Block Design (RBD) replicated thrice with 6 plants per plot. Observations on the growth parameters were recorded one year after planting and continued up to 5 years of crop growth. Three years after planting, test tapping was initiated and continued upto fourth and fifth year. The plants were test tapped ten times to obtain the dry rubber yield of the individual clones. On the basis of the continues 3 years of test tappings, the clone RRST 37 attained the highest girth (30.3 cm) and yield (71.7 g/t/10tap) followed by RRSG x 9 (66.0 g/t/10tap) and RRSA 121 (57.2 g/t/10 tap) where as the check clone RRIM 600 yielded 44.4 g/t/10 tap. In case of girth increment RRST 24 attained highest girth increment of 24 cm over a period of 5 years followed by RRST 37 (22 cm) and RRST 30 (21.5 cm) whereas the check clone RRIM 600 achieved the girth increment of 21.2 cm. This experiment suggests the scope for preliminary evaluation of clones in a nursery.
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