营养元素的供给状况和水平,直接影响作物的产量和品质,作物的营养元素包括大量元素和微量元素。微量元素同其他营养元素一样,既不可缺少,也不能相互代替。 农业上应用微量元素已有三十多年的历史,但大量使用微肥,则是六十年代以后的事,尤其是近年来发展很快,1983年美国微肥产量4.7万吨,占其全部化肥销售量的0.2～0.3,居世界各国之首。 Nutrient supply status and level, directly affect the yield and quality of crops, crop nutrients include a large number of elements and trace elements. Like other nutrients, trace elements are indispensable and can not be replaced by each other. Trace elements have been used in agriculture for more than thirty years. However, the use of trace fertilizers is a matter after the 1960s, especially in recent years. In 1983, the production of trace fertilizers in the United States was 47,000 tons, accounting for all Fertilizer sales of 0.2 to 0.3, ranking first in the world.