Long-term effect of tapping and stimulation frequency on yield performance of rubber clone GT 1


Citation

Do Kim Thanh, . and Sivakumaran S., . and Wong Kai Choo, . Long-term effect of tapping and stimulation frequency on yield performance of rubber clone GT 1. pp. 96-107. ISSN 0127-7065

Abstract

A fourteen-year experiment was conducted to study the yield responses and dryness incidence of rubber clone GT1 to half- spiral tapping at frequencies d/2 (alternate daily) d/3 (third daily) and d/4 (fourth daily) in combination with stimulation frequencies of 0/y (unstimulated control) 2/y (two rounds/year) 3/y (three rounds/year) 4/y (four rounds/year) and 6/y (six rounds/year) of ethephon at 2.5 concentration applied by groove method. Mean dry rubber yield/tree/tapping (g/t/t) and mean dry rubber yield/hectare/year (kg/ha/year) over 14 years of tapping were affected by interaction between tapping and stimulation frequencies. Under high stimulation frequencies of 4/y and 6/y there was a progressive increase in g/t/t with reduction in tapping frequencies from d/2 to d/4. This has led to comparable kg/ha/year among the three tapping frequencies. In spite of lesser number of tappings d/3 tapping frequency produced cumulative yield (kg/ha) comparable to that of d/2 tapping frequency. Positive responses of g/t/t kg/ha/year and cumulative kg/ha to stimulations 4/y and 6/y were obtained only under low tapping frequencies of d/3 and d/4. Virgin and renewed tapping panels responded in a similar manner to the tapping and stimulation treatments. Dryness incidence was not significantly affected by any of the treatment combinations.


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Abstract

A fourteen-year experiment was conducted to study the yield responses and dryness incidence of rubber clone GT1 to half- spiral tapping at frequencies d/2 (alternate daily) d/3 (third daily) and d/4 (fourth daily) in combination with stimulation frequencies of 0/y (unstimulated control) 2/y (two rounds/year) 3/y (three rounds/year) 4/y (four rounds/year) and 6/y (six rounds/year) of ethephon at 2.5 concentration applied by groove method. Mean dry rubber yield/tree/tapping (g/t/t) and mean dry rubber yield/hectare/year (kg/ha/year) over 14 years of tapping were affected by interaction between tapping and stimulation frequencies. Under high stimulation frequencies of 4/y and 6/y there was a progressive increase in g/t/t with reduction in tapping frequencies from d/2 to d/4. This has led to comparable kg/ha/year among the three tapping frequencies. In spite of lesser number of tappings d/3 tapping frequency produced cumulative yield (kg/ha) comparable to that of d/2 tapping frequency. Positive responses of g/t/t kg/ha/year and cumulative kg/ha to stimulations 4/y and 6/y were obtained only under low tapping frequencies of d/3 and d/4. Virgin and renewed tapping panels responded in a similar manner to the tapping and stimulation treatments. Dryness incidence was not significantly affected by any of the treatment combinations.

Additional Metadata

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Item Type: Article
AGROVOC Term: Hevea
AGROVOC Term: Hevea brasiliensis
AGROVOC Term: Plant growth regulators
AGROVOC Term: Plant hormones
AGROVOC Term: Harvesting
AGROVOC Term: Tapping
AGROVOC Term: Ethephon
AGROVOC Term: Experiments
AGROVOC Term: Yields
AGROVOC Term: Tropical crops
Geographical Term: Malaysia
Depositing User: Ms. Suzila Mohamad Kasim
Last Modified: 28 Apr 2025 03:57
URI: http://webagris.upm.edu.my/id/eprint/23363

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