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An Incision method for early selection of Hevea seedlings

By: Contributor(s): Material type: TextTextPublication details: Indian Journal of Natural Rubber Research 1989Description: 112-117Subject(s): Summary: Four hundred and forty nine seedlings belonging to fourteen cross combinations were evaluated at an age of one year by an incision test method. A special knife was designed for this purpose. Normal test tapping was adopted when the seedlings attained an age of two years. The yield at one year by test incision method showed a highly significant positive correlation (P<0.01) with the test tap yield. Hence the comparatively simpler and rapid incision test method is suggested as an alternative for the more elaborate and time consuming test tap methods. Girth of one year sold seedlings was positively correlated with that at two years (r=0.81**)and also with yield at the age of one year (r=0.76**). Among the 14 families, the cross combinations PB 242 x RRII 105, PB 242 x PB 86 and PB 5/51 x RRII 208 recorded higher girth and juvenile yield at one year as well as two years. A similar trend was noticed for plant height at one year age. The families RRII 105 x PR 107, RRIM 600 x T1 1 and RRIM 600 x RRII 203 recorded higher number of leaf flushes. Test of significance for the different characters revealed no significant difference between families but there were significant differences within the families for girth, incision test yield and test tap yield.
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Articles Articles RRII Library Botany Volume 2, Issue 2 Articles
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Four hundred and forty nine seedlings belonging to fourteen cross combinations were evaluated at an age of one year by an incision test method. A special knife was designed for this purpose. Normal test tapping was adopted when the seedlings attained an age of two years. The yield at one year by test incision method showed a highly significant positive correlation (P<0.01) with the test tap yield. Hence the comparatively simpler and rapid incision test method is suggested as an alternative for the more elaborate and time consuming test tap methods. Girth of one year sold seedlings was positively correlated with that at two years (r=0.81**)and also with yield at the age of one year (r=0.76**). Among the 14 families, the cross combinations PB 242 x RRII 105, PB 242 x PB 86 and PB 5/51 x RRII 208 recorded higher girth and juvenile yield at one year as well as two years. A similar trend was noticed for plant height at one year age. The families RRII 105 x PR 107, RRIM 600 x T1 1 and RRIM 600 x RRII 203 recorded higher number of leaf flushes. Test of significance for the different characters revealed no significant difference between families but there were significant differences within the families for girth, incision test yield and test tap yield.

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