IRRI Annual Report 1972

This is the 11th annual report of the International Rice Research Institute since it was founded in 1960. The major financial supporters of IRRI are the Ford Foundation, The Rockefeller Foundation, U.S. Agency for International Development, The Overseas Development Administration (U.K.), the International Development Research Centre (Canada), and the Japanese govern-ment. This report covers work done during the 1972 calendar year. The thumb index on the back cover provides quick access to any research section. To use it, bend the book in half and follow the margin index to the page with the black edge marker. Data in the report are given in metric units, e.g. "t/ha" means metric tons per hectare. Unless otherwise stated, control means untreated control, grain yield is calculated as rough rice at 14 percent moisture, and protein content is calculated as a percentage of brown rice at 14 percent moisture. A single asterisk el means significant at the 5 percent level, a double asterisk (as) means significant at the 1% level, but if value for a control is given, a single asterisk means significantly different from the control at the 5% leVel and a double asterisk means significantly different from the control at the 1% level. The report frequently mentions three fundamental types of rice culture. Upland culture means rice grown without irrigation in fields without bonds. Rainfed paddy culture means rice grown without irrigation but in fields that are bunded to impound rainfall. Irrigated or flooded culture means rice grown with irrigation in bonded fields