六十年代国外化肥产量和消费量都有很大的增长,平均年增长率分别为12%和10%。而粮食增产有(1/3)—(2/3)系来自施肥的效果。1972年国外共施用化肥(有效成分—下同)达7,210万吨,其中有3,200吨为氮肥;预计1980年施肥量将增至11,400万吨,其中氮肥将增至6,000多万吨。 In the 1960s, the output and consumption of chemical fertilizers abroad have greatly increased with average annual growth rates of 12% and 10% respectively. The grain yield (1/3) - (2/3) from the effect of fertilization. In 1972, 72.2 million tons of fertilizers were used abroad, of which 3,200 tons were nitrogen fertilizers. Fertilizers are expected to increase to 114 million tons in 1980, of which nitrogen fertilizer will increase to more than 60 million tons.