Interactions in Mg and K uptake were studied especially in relation with the following factors affecting ion uptake, a. the mechanisms of absorption of both ions involved, b. the relationship between absorption of the ions and their concentrations in the nutrient solution, c. the relationship between absorption of the ions and their ratios in the nutrient solution, particularly K: Mg, and the effects of H, Ca, N and P on the absorption of K and Mg.These factors were examined in long and short experiments. Results were tested for correspondence with the carrier theory and the adsorption theory of ion absorption. Both theories proved useful in explaining the characteristics of ion absorption in oats. The possibility of a system of adsorption before absorption of ions through a carrier system was considered but was not further explored in this study. The mathematical models for a combination of the two systems were similar to those employed for the carrier theory.In both tops and roots of oat plants grown in the long-term experiment, Mg and K contents were inversely correlated. This antagonism could be explained as competition for carrier sites common for both ions. Mg absorbed by the root mechanism common for Mg and K was not transported into tops in the shortterm experiment, when plants had low ratios of K:Mg.
There are no comments yet. You can post the first one!
Post a comment
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.