1840年,丁·李比希(JustusLiebig)研究了各种化学物质对植物的影响,他发现,各种作物的产量,通常不受它所需要的大量营养元素的限制,反而受到那些只是微量需要的原料产生的限制。只要稍微加入所缺的微量元素,如微量元素硼(B)、镁(Mg)、铁(Fe)等,作物产量马上明显地提高。据此,李 In 1840, Justus Liebig studied the effects of various chemicals on plants. He found that the yield of various crops, which is usually not limited by the large amount of nutrients they require, is rather limited by the raw materials that are only slightly needed Restrictions. As soon as a few additions to the missing trace elements, such as the trace elements boron (B), magnesium (Mg), iron (Fe), etc., crop yields immediately increased significantly. Accordingly, Li