Elements such as zinc, boron, iron and molybdenum that are essential for plant and microbial growth, but are only needed in very small amount. In the case of molybdenum, this may only be ounces per ha.

Nutritional trace elements, such as boron and manganese, that are necessary in minute quantities for normal plant growth.

essentials needed for all plants, include iron, manganese, copper, boron, molybdenum, chlorine, colbalt, and zinc.

Micronutrient (on the other hand) is a category of food needed by our body in much smaller amounts for maintaining optimum health. These are: vitamins, minerals, and essential fatty acids. However, medical scientists have found a host of other micronutrients that are also very important, and are grouped under flavanoids, and phytochemicals.

The vitamins, minerals and certain other substances that are required by the body in small amounts. They are measured in milligrams or micrograms

A substance, such as a vitamin or mineral, that is essential in minute amounts for the proper growth and metabolism of a living organism.