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Periodic tapping system as an effective approach for sustained yield responses on young mature rubber

By: Contributor(s): Material type: TextTextPublication details: Papers presented at IRRDB seminar 5-8 November 1996 Sri Lanka p19-20Subject(s): Summary: Early experiences from stimulation of young mature rubber tapped with the conventional systems, 1/2S d/2 or d/3, produced unfavourable yield trends, in which the initial high yield responses were followed be negative yield responses from the same or subsequent panels. In addition, a higher incidence of dryness and bark consumption were observed. Moreover, the current acute shortage of skilled tappers has precluded the practice of conventional tapping systems which has resulted in the delayed opening of young, mature rubber. Thus, periodic tapping systems, modified forms of conventional systems, were evaluated as an effective approach to sustain yield responses and to solve the tapper shortage. Several clones were tested from the very commencement of opening for tapping using various combinations of tapping, rest and stimulation regimes. Results from these various trials of periodic tapping systems indicated that long term positive response were sustained covering both panels BO-1 and BO-2. Besides enhanced land productivity, tapper productivity, and consequently income, was improved. As the periodic tapping systems incorporate a tapping rest, there is some saving in tapper requirements by 1 - 25;coupled with this advantage are reductions in bark consumption, a low incidence of dryness and DRC values that are comparable to conventional tapping systems. As a result of the use of these periodic tapping systems, all young mature rubber can be opened for tapping at the correct girth and the problem of the acute shortage of tappers can be alleviated.
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Early experiences from stimulation of young mature rubber tapped with the conventional systems, 1/2S d/2 or d/3, produced unfavourable yield trends, in which the initial high yield responses were followed be negative yield responses from the same or subsequent panels. In addition, a higher incidence of dryness and bark consumption were observed. Moreover, the current acute shortage of skilled tappers has precluded the practice of conventional tapping systems which has resulted in the delayed opening of young, mature rubber. Thus, periodic tapping systems, modified forms of conventional systems, were evaluated as an effective approach to sustain yield responses and to solve the tapper shortage. Several clones were tested from the very commencement of opening for tapping using various combinations of tapping, rest and stimulation regimes. Results from these various trials of periodic tapping systems indicated that long term positive response were sustained covering both panels BO-1 and BO-2. Besides enhanced land productivity, tapper productivity, and consequently income, was improved. As the periodic tapping systems incorporate a tapping rest, there is some saving in tapper requirements by 1 - 25;coupled with this advantage are reductions in bark consumption, a low incidence of dryness and DRC values that are comparable to conventional tapping systems. As a result of the use of these periodic tapping systems, all young mature rubber can be opened for tapping at the correct girth and the problem of the acute shortage of tappers can be alleviated.

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