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acid acres Advisory alternate-daily Annual Report areas Asiatic Rubber Instructors Avros 50 bark Beeley Botanical Division British Rubber Budded Trees budgrafts budwood carried Centrosema pubescens Chemical Division clonal clones coagulation Cockchafer Committee compared continued cost cover plants creaming dry rubber effect estates experimental Field Full-spiral girth growth substance half-circumference half-spiral Hand pollination Hevea inches incidence increase infection inland soils investigation Johore jungle Kedah Kelantan Kuala Kuala Lumpur laboratories latex legumes Malay Malaya manuring ment methods months rest natural covers Negri Sembilan nitrogen obtained Pahang Perak percentage period Pests phosphate Pilmoor Planters plots preparation R.R.I. Experiment Station replanting Report for 1938 root disease Rubber Research Institute rubber trees samples scion seed seedling trees Selangor serum sheet small-holders Soils Division staff Table tapping cut Tapping Experiment tapping height tapping systems tests tion Total treatment trees tapped unbudded visits vulcanisation young rubber