Such a discovery was made a century ago and was heralded *and utilized by the leadIng nations of Europe. with the result that their wornout soils have been so rejuvenated that now they produce 2 bushels of grain where formerly they produced but 1. But for the fact that Europe learned to rotate her cereal crops with a hoed root crop and thereby doubled her acreage yield of cereals. European nations still would be encouraging and assisting emigration because of inability to feed their increasing population. Strange as it may seem. this important discovery has not been exploited in the United States. With few exceptions American writers on agricultural topics seem to have been totally oblivious both as to the cause and of the fact that the wornout soils of Europe have been so built up that they now produce 2 bushels of grain where the virgin soils of the United States produce but 1.
Keywords matched
emigration