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acid acres aldrin Andaman area under rubber average brown bast Chairman chlordane clonal seedlings clones co-operative cost cover crop dieldrin disease effect Ernakulam estates factors female flowers fertiliser flow girth increase Government grade growth hectares heptachlor Hevea brasiliensis high yielding holders important initial Institute of India K. T. Jacob Kerala Kottayam lakhs latex latex vessels lb per acre Malaya Malaysia manufacturers manuring ment method months Mundakayam natural rubber nectaries nectariferous newplanting nitrogen P. S. Habeeb Mohamed period phosphate plantation industry planters planting materials potash price of natural production region RRII RRIM Rubber Board rubber cultivation rubber growers rubber plantation rubber producing countries Rubber Research Institute rubber trees scheme sector seed gardens Shri P. S. Habeeb skim latex skim rubber small growers small holdings soil South India spraying subsidy synthetic rubber Table termites tion Tjir tonnes unselected upto wind damage young plants