<Li> Iron is essential for chlorophyll synthesis, which is why an iron deficiency results in chlorosis . </Li> <Li> Manganese activates some important enzymes involved in chlorophyll formation . Manganese deficient plants will develop chlorosis between the veins of its leaves . The availability of manganese is partially dependent on soil pH . </Li> <Li> Molybdenum is essential to plant health . Molybdenum is used by plants to reduce nitrates into usable forms . Some plants use it for nitrogen fixation, thus it may need to be added to some soils before seeding legumes . </Li> <Li> Nickel is essential for activation of urease, an enzyme involved with nitrogen metabolism that is required to process urea . </Li>

Which of the following is not an example of a micronutrient