Effects of tapping and intensive stimulation on yield dryness incidence and some physiological latex parameters of clone RRIM 600

Do K. T., . and Sivakumaran S., . and Wong K. C., . Effects of tapping and intensive stimulation on yield dryness incidence and some physiological latex parameters of clone RRIM 600. pp. 200-214. ISSN 0127-7065

A four-year experiment studied the yield responses dryness incidence and some physiological latex parameters of clone RRIM 600 on two tapping frequencies (alternate daily d/2; fourth daily d/4) of half-spiral tapping system combined with four stimulation frequencies unstimulated control (0/y); 4 applications/year (4/y); 30 applications/year (30/y); 60 applications/year (60/y) of 2.5 ethephon applied by groove method. Low tapping frequency of d/4 gave significantly higher g/t/t but lower kg/ha/year and cumulative kg/ha when compared to d/2 frequency. When very high stimulation frequency of 30/y or 60/y were applied the bulk of the yield increase in response to stimulation was only recorded in the first year of tapping with increase thereafter being marginal when compared to the unstimulated control. No significant differences in yield were obtained between stimulations 30/y and 60/y. Incidence of dryness was not affected by stimulation frequency upto 30/y but was significantly increased when at stimulation frequency of 60/y. Trees tapped on d/2 frequency in contrast to d/4 recorded consistently lower readings of physiological latex parameters such as plugging index (PI) initial flow rate (IFR) total solid content (TSC) and dry rubber content (DRC) but higher bottom fraction (BF) thiol content (R-SH) and inorganic phosphorus content (Pi). Similarly intensive frequencies of stimulation (30/y and 60/y) produced lower values of PI IFR TSC and DRC but higher values of BF and Pi when compared to low stimulation frequency 4/y or unstimulated control. Under our experimental conditions sucrose and pH of latex were not affected by both tapping and stimulation treatment and this finding is at variance with other published reports. The significance of changes in these various physiological latex parameters are discussed in relation to yields obtained with the different combinations of tapping and stimulation frequencies.

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Abstract

A four-year experiment studied the yield responses dryness incidence and some physiological latex parameters of clone RRIM 600 on two tapping frequencies (alternate daily d/2; fourth daily d/4) of half-spiral tapping system combined with four stimulation frequencies unstimulated control (0/y); 4 applications/year (4/y); 30 applications/year (30/y); 60 applications/year (60/y) of 2.5 ethephon applied by groove method. Low tapping frequency of d/4 gave significantly higher g/t/t but lower kg/ha/year and cumulative kg/ha when compared to d/2 frequency. When very high stimulation frequency of 30/y or 60/y were applied the bulk of the yield increase in response to stimulation was only recorded in the first year of tapping with increase thereafter being marginal when compared to the unstimulated control. No significant differences in yield were obtained between stimulations 30/y and 60/y. Incidence of dryness was not affected by stimulation frequency upto 30/y but was significantly increased when at stimulation frequency of 60/y. Trees tapped on d/2 frequency in contrast to d/4 recorded consistently lower readings of physiological latex parameters such as plugging index (PI) initial flow rate (IFR) total solid content (TSC) and dry rubber content (DRC) but higher bottom fraction (BF) thiol content (R-SH) and inorganic phosphorus content (Pi). Similarly intensive frequencies of stimulation (30/y and 60/y) produced lower values of PI IFR TSC and DRC but higher values of BF and Pi when compared to low stimulation frequency 4/y or unstimulated control. Under our experimental conditions sucrose and pH of latex were not affected by both tapping and stimulation treatment and this finding is at variance with other published reports. The significance of changes in these various physiological latex parameters are discussed in relation to yields obtained with the different combinations of tapping and stimulation frequencies.

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Item Type:	Article
AGROVOC Term:	Hevea brasiliensis
AGROVOC Term:	Rubber crops
AGROVOC Term:	Tapping
AGROVOC Term:	Stimulation
AGROVOC Term:	Crop yield
AGROVOC Term:	Susceptibility to dryness
AGROVOC Term:	Latex
AGROVOC Term:	Productivity
AGROVOC Term:	Ethephon
AGROVOC Term:	Flow rate
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 03:57
URI:	http://webagris.upm.edu.my/id/eprint/23370

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