Growers have not been willing to replant because of the long gestation period. They continue to tap aged trees as they feel that despite lower yields of natural rubber (NR), the current high prices are remunerative, it said in a statement.
"Growers need to be encouraged to re-plant with higher re-plantation subsidies. Since NR prices have come off from their peak levels currently, growers will be more receptive towards re-plantation initiative of the Rubber Board," Automotive Tyre Manufacturers' Association (ATMA) said.
A rubber tree has a gestation period of six to seven years, before the tree is ready to be tapped. Between 7 to 10 years, a rubber tree is tender-yielding followed by 10 years of maximum yield after which the yield begins to peter out.
Stating that India poses a "grave risk" of lower NR production in the coming years, ATMA Director General Rajiv Budhraja said: "While recent instances of drop in production or cut in projected estimates were attributed to inclement weather, the fact remains that yields are under pressure in view of ageing of trees in India."
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Budhraja said that the "worrisome trend" is that India is "sub-optimally" using its existing natural rubber resources by not resorting to timely re-plantation, while other consuming nations are consolidating their supplies by even developing plantations overseas.
Natural rubber productivity, which stood at 1903 kg per hectare in 2008, has come down to 1823 kg per hectare in 2012, he added.
According to ATMA's latest study, as much as 45 per cent of NR plantations in India are in the low-yielding 'aged' category, out of which one-fourth are over-aged.
ATMA members are the largest consumers of natural rubber in India accounting for 70 per cent of total consumption.