Fertilizer use: Spearhead of agricultural development

The use or fertilizer increased during the 90 years following its introduction about 1850, at a fairly constant rate (apart from world war and economic depressions), reaching about 9 million tons per year just before the second world war. After the was, fertilizer use increased more rapidly by an average of about 1 million tons per year to over 29 million tons in 1962.

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