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31 December acid acres ammonia areas bale Botanical Division brown bast budded budwood carried cent chemical choline clonal seedling clone RRIM 501 clone Tjir coagulation concentrations copper crepe daily system developed dry rubber effect emulsion established estates examination experimental fertilisers field full spiral girth half spiral hand pollination Hevea Hevea brasiliensis increase in yield investigation Johore Kedah Kelantan laboratory lalang large scale trials latex latices leaching leaf leave lignin manuring masterbatch mature rubber method months Negri Sembilan nitrogen nursery nutrient obtained old rubber Pahang palm oil Perak period phosphate planting material potash prepared production programme R.R.I. Experiment Station replanting reported root disease rubber hydrocarbon Rubber Instructors Rubber Research Institute rubber seedlings rubber trees samples seed seedling families Selangor series clones sheet showed smallholders sodium arsenite soil soluble spraying stumps Sungei Buloh technical classification termites tion treatments volatile acid yield stimulants young rubber