There is no established need for vanadium in plants.
Small amounts appear beneficial to growth and too much inhibits growth.
There is no visible signs of vanadium deficiency in plants. Vanadium needs in Humans Vanadium is a mineral that appears vital to growth. Human daily requirements for vanadium are estimated at 100 to 300 micrograms needed daily. Most passes through the body in 24 hours. Vanadium is not yet an established mineral necessary to human health, but is known not to be toxic in doses of less than 100 micrograms a day.