By Hartwig H Geiger; Josef N?osberger; Paul Christiaan Struik
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Extra resources for Crop science : progress and prospects
Soil Science Society of America Journal 59, 661–667. J. R. (1997) The Assessment of the Status of Humaninduced Soil Degradation in South and Southeast Asia. UNEP/FAO/ISRIC, Nairobi/ Rome/Wageningen. Miwa, E. (1990) Global nutrient flow and degradation of soils and environment. Transactions of the 14th International Soils Science Society Congress, Kyoto, Japan, Vol. 5, pp. 271–276. T. R. (1994) An international methodology for an assessment of soil degradation and georeferenced soils and terrain database.
2). This unevenness raises three concerns. First, current rates of gain are not sufficient to satisfy demand in some developing countries. 7% of present yield levels (Table Research to Assure Food Security 37 Fig. 2. Yield trends of maize, rice and wheat for selected countries from 1966 to 1999. Estimates of the rate of yield gain were obtained by linear regression of yield versus year. org). G. 2). Without a substantial increase in the rate of yield gain, most African countries will require cereal imports to meet demand.
A threat to developing country food security by 2020? Food, Agriculture and Environment Discussion Paper 27. IFPRI, Washington, DC. J. (2001) The future food security and economic consequences of soil degradation in the Developing World. J. and Sambanpanit, S. (eds) Response to Land Degradation. Oxford Press, New Delhi. S. (1986) Building national and global nutrition security systems. S. K. (eds) Global Aspects of Food Production. Natural Resources and Environment Series, Vol. 20. Tycooly Publishing Ltd, London, pp.
Crop science : progress and prospects by Hartwig H Geiger; Josef N?osberger; Paul Christiaan Struik