土壤样品组成复杂。其中某些被测元素含量很低,测定时受共存元素和其他种种干扰较严重,给分析造成一定困难。然而,这项分析又是发展农业生产,搞好环境保护所必需。因此,世界上许多国家都建立了土壤和作物分析专门机构。如在美国,这种机构竟成为一个大的商业部门。据报导,仅1978年,美国政府部门及有关商业实验室就为农民分析3034520个土壤样品。以后几年都有增无减。 Soil sample composition is complex. Some of these elements are very low measured content, measured by the co-existence of elements and other more serious interference, to analyze some difficulties. However, this analysis is also necessary for developing agricultural production and improving environmental protection. Therefore, many countries in the world have established soil and crop analysis specialized agencies. As in the United States, such a body has become a big business sector. It is reported that in 1978 alone, the U.S. government departments and relevant commercial laboratories analyzed 3034520 soil samples for farmers. After a few years are increasing.