The Effect of Ferrous Iron on the Uptake of Manganese by Juncus effusus L.

Abstract
Juncus effusus L was grown in solution culture at five levels of ferrous iron The concentration and amount of manganese in the shoots decreased with increased iron concentration in the solution, except at the highest iron concentration (128 p p m) where there was a significant increase in manganese concentration It is suggested that this increase is due to a chemical interaction in the culture solution The importance of a Fe Mn ratio of two as a general rule in plant nutrition is questioned