The rubber tree book . on. The half-herring-bone system is at present the favouritesystem of tapping. Carefully executed, with a reasonablenumber of cuts, three or four, it can be so laid out as to allowfor a four-years period for bark-renewal. Every-day tapping,on one side of the tree only, is the soundest method and gener-ally gives much the best returns. Some contend that cuts on two sides of the tree, tapping onalternate days, is a system with at least equal merits; but thisis obviously wrong. It interrupts the passage of plant-foodthrough the bast over twice as large an area of bark. It i
The rubber tree book . on. The half-herring-bone system is at present the favouritesystem of tapping. Carefully executed, with a reasonablenumber of cuts, three or four, it can be so laid out as to allowfor a four-years period for bark-renewal. Every-day tapping,on one side of the tree only, is the soundest method and gener-ally gives much the best returns. Some contend that cuts on two sides of the tree, tapping onalternate days, is a system with at least equal merits; but thisis obviously wrong. It interrupts the passage of plant-foodthrough the bast over twice as large an area of bark. It isbetter to confine the interrupted area to as small a space aspossible. For this reason it is better to confine tapping toone quarter-section of the tree, and the half-herring-bone inthis way presents advantages over the full-herring-bonesystem. The tapping results on two of the best-known estates inSumatra are interesting. One tapped both sides of the treesevery day, while on the other neighbouring estate two sides of. Fig. 40.—Marking Trees for Tapping. TAPPING 157 the trees were tapped, but only on one side each alternate yield per tree was the same in each case, but the secondestate got its yield with only one-half the amount of barkexcised which was thought necessary in the case of the firstestate. IM»%. ^^ - ~ . T^iV^ ? , •~ . Fig. 41.—Tapping by Half-herring-bone, Quarter-sectionSystem, Four Cuts. Tapping by means of spiral oblique cuts on a one-thirdsection of the trees is a system very popular in Ceylon and notunknown in other countries. Each one-third section of the treehas to last for a year, and thereafter, if and when the treehas grown sufficiently, the tree is divided into dangers of using up the bark too quickly is much greater 158 THE RUBBER TREE BOOK under this system than in quarter-section tapping on thehalf-herring-bone method. In the fourth year of tapping onewould be inevitably tapping on renewed bark only three yearsold
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