Indeterminate nodules are the only type found in Caesalpiniodeae and Mimosoideae and the most common type in Papilionoideae (Sprent, 2001; p. 32). As a result of the variety of ways the plant is infected by rhizobia, there are different types of nodules.
Minerals are inorganic nutrients that are needed in relatively small quantities by the horse. The essential major minerals are calcium, phosphorus, magnesium, sodium, chloride, potassium and sulfur. The essential trace minerals needed are iron, zinc, copper, selenium, manganese, iodine, and cobalt.
However, horsetail is valued more for its health benefits due to a number of great minerals and other nutrients it contains, such as manganese, calcium, iron, flavonoids, caffeic acid esters, saponins, tannins, alkaloids, fatty acids, phytosterols, glycosides, phenolic acids, aconitic acid, and silica.