Rice production before Green Revolution In the years before the war, rice farmers managed their rice production through their experiences and direct observations. Changes in total rice production over time involved changes in yield with relative proportion of irrigated, rainfed and upland areas, the change of seasonal harvesting pattern, and variety planted (Gonzalo, 1952). In 19091913, average rice production was only16 cavans per hectare. With new and superior varieties and planting of better seeds, yield increased to 24 cavans per hectare in 1919 to 28.4 cavans per hectare in 1929 and became constant up to 1948 at the level of 28.4 cavans/ha (Fig. 1, Serrano, 1952). There was no increase in yield since 1955 despite the increasing harvested areas, until it reached 28 cavans/ha (1.20t/ha) in 1966 (Fig 2). In 1968, the yield reached an average of 30 cav/ha but the highest increase was observed in 1970 at an average of 40 cav/ha (Fig 2 and 3). The increase of rice production was also attributed to the construction of irrigation canals in 1920â€™s and the further expansion of irrigated areas in 1946 with the construction of big dams and concrete canals. Likewise, when chemical fertilizer was introduced in 1951, coupled with better rice varieties and irrigation, production was increased to 28.3 cavans/ha or 7,273,294 cavans in fertilized 257,046 hectares of rice field compared to 25.1 cavans per hectare of unfertilized areas.
Published on Mar 21, 2011
July 2005 Philippine Institute for Development Studies Surian sa mga Pag-aaral Pangkaunlaran ng Pilipinas For comments, suggestions or furth...