24. Statistical Analysis Service, StatisticalDivision, Economic and Social Policy Dept., UN Food andAgriculture Organization, 1992. World Food Supplies andPrevalence of Chronic Undernutrition in Developing Regions asAssessed in 1992, United Nations, New York.
Quality and Degradation: The loss of productive soil hasoccurred as long as crops have been cultivated. Lal and Pierce () in stating this, report that landdegradation has now become a major threat to the sustainabilityof world food supply. This loss arises from soil erosion,salinization, waterlogging, and urbanization with its associatedhighway and road construction. Nutrient depletion,overcultivation, overgrazing, acidification, and soil compactioncontribute as well. Many of these processes are caused or areaggravated by poor agricultural management practices. Takentogether or in various combinations, these factors decrease theproductivity of the soil and substantially reduce annual cropyields (), and, more important,will reduce crop productivity for the long term ().
Bunge | Agribusiness | Food Production Company
Soil and Water Conservation: The high rate of soil erosion nowtypical of world agricultural land emphasizes the urgency ofstemming this loss, which in itself is probably the mostthreatening to sustained levels of food production. Improvedconservation of water can enhance rainfed and irrigated cropyields, as discussed below.
Agriculture and Food Production | IFPRI
Scenario PS adopts most of the assumptions in BAU, butincludes several other factors which may decrease the rate ofgrain production in the years ahead. If the population growthrate continues only slightly lower than it is today to the year2050, the world population will rise to about 13 billion (), more than double the presentpopulation. A recent analysis ()of the consequences of climatic change on world food production,not including problems arising from the availability ofirrigation water, concluded that decreases in global foodproduction would
Global Food Security: 10 Challenges - The Globalist
In general, it appears that Africa, as noted earlier, as wellas China and India, will face particularly severe problems inexpanding their food supplies in the coming decades. The peopleof these regions are likely to comprise almost two thirds of thedeveloping countries', and over half of the world's, population,both in 2025 and 2050.
Read the statements below in Figure 1: Food Facts
Grainland declined from 718 million ha in 1980 to 704 millionha in 1991 (), a decline we assumecontinues, leading to 620 million ha in 2050. There is 0.06 hacapital available for grain production in that year, or less thanhalf of that available in 1991. This will create major obstaclesto increasing grain food production, especially if landdegradation continues (). The rateof loss we assume is about half that projected for the next 25years in The Netherlands report on the National EnvironmentalOutlook 1990-2010, ()
Nutrition : WHO > Programmes and ..
A major difficulty arises simply from the rate with which foodsupplies would have to be expanded to pace or to exceedpopulation growth rates in those countries experiencing highgrowth rates. In order to stay even with population growth itwill be necessary to expand food supplies, globally, by the rateof population increase. For many countries the rate of populationexpansion is in the range 2-3% yr. As an example, in order toachieve an increase of 50% in the per capita food production, bythe end of a population doubling, the rate of expansion ofagricultural production must be appropriately larger. If thepopulation grows at 2% yr, the food production must increase at3.2% yr, if it is 3% yr, the food production must grow at 4.8%yr.