Challenge of Plant and Agriculutral Sciences to the Crisis by Kazuo Watanabe, Atsushi Komamine

By Kazuo Watanabe, Atsushi Komamine

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3. World total harvested area of cereals and per capita harvested area of cereals. Note: used mainly the FAO data and additionally the USDA data. of the agricultural land along the main roads (about 500 meters on both sides) within about 50 kilometers radius from main cities had probably been purchased by some nonagricultural entities, and agricultural production there was abandoned. According to my own observations during the last twenty years, a large part of one million hectares of good paddy land in the Menam Chao Phraya Delta surrounding Bangkok, Thailand has been converted to factories, houses, roads and vast unused land.

The fast grain yield increase of the green revolution was made possible mainly by the increased use of fertilizers. The world total fertilizer use started to fall from the late eighties, and it had continued to fall until the midnineties; it is expected to be stabilized during the nineties as a whole. 24 The recent yield stagnation may reflect the exhaustion of our accumulated technical knowledge of the grain varieties. 22,27 Yields of rice and wheat have recently seemed to be reaching a plateau and it is feared that they are near the biological limits for rice and wheat.

International Food Policy Research Institute, 1995:222. 21. Evenson R, David C. Rice research and productivity. In: OECD. Adjustment and Technology: The Case of Rice. Paris: OECD, 1990:57-84. 22. Plucknett D. Prospects of meeting future food needs through new nechnology. In: Islam N, ed. Population and Food in the Early Twenty-First Century: Meeting Future Food Demand of an Increasing Population. Washington, D. : International Food Policy Research Institute, 1995:208. Food Shortage in the 21st Century and Its Implications for Agricultural Research 23.

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