Mulders chart question

Hey guys, so... I'm not quite sure I'm understanding the chart right. If Mg is low then that causes P to be low as well?

Antagonism: High levels of a particular nutrient in the soil can interfere with the availability and uptake of other nutrients. For example, high nitrogen levels can reduce the availability of boron, potash and copper; high phosphate levels can influence the uptake of iron, calcium, potash, copper and zinc; high potash levels can reduce the availability of magnesium. Thus, the application of high levels of nitrogen, phosphorus and potassium can induce plant deficiencies of other essential elements.