美国明尼苏达州大学农业试验站的土壤学家Bill Fenster对微量元素肥料的施用提出了下列见解:明尼苏达州结构良好的中性土本不提倡用镁肥。但Fenster说,虽然土壤试验表明不缺镁,但是许多土壤实验室仍推荐施用镁肥。实际上只在结构不良和酸性大的土壤缺 Bill Fenster, a soil scientist at the Agricultural Experiment Station at the University of Minnesota in the United States, put forward the following observations about the use of trace element fertilizers: Minnesota does not advocate the use of magnesium fertilizers with well-structured neutral soil. However, Fenster said that while soil tests show that there is no shortage of magnesium, many soil labs still recommend the use of magnesium fertilizers. In fact, only poorly structured and acidic soil is missing