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Soil Conservation
Agriculture in the United States during the last twenty years has benefited from more revolutionary developments than at any time or place in history. These changes have been the result of an unprece- dented use of the findings of this age of chemistry and mechanization in just about everything that is done on the modern farm or ranch.
This period of modernization of agriculture has been distinguished by a history-making effort to find a practical solution to the age-old problem of achiev- ing a permanently productive agriculture. All agri- cultural production starts with the soil. It follows, therefore, that in considering what could or should be done to ensure the continued productivity of the soil, the first essential is to keep it in place. Many of our past and present farm, forest, and grazing land management practices have not met this re- quirement, Loss of soil by wind and water erosion has been severe enough to have lowered the produc- tivity and thus increased the cost of production on over 50 per cent of the agricultural land in the United States. Results from experiments in many im- portant farming regions of this country show that under many existing land management systems the average annual loss of soil by erosion exceeds the most liberal estimates of the amount of soil formed each year by as much as a hundredfold. This can
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