Abstract
AbstractA volcanic ash‐derived soil was incubated up to 93 days with different amounts of seaweed. P was then extracted using an anion exchange resin method, and it was found that extractable P increased with increasing amounts of seaweed, which was added in proportions of .1, .5, 1.5, and 4.0%. Radishes grown in the same soilseaweed mixtures absorbed more P than from the control and increased their yield with the increase of seaweed.On adding seaweed and KH2PO4 simultaneously to the soil, an interaction between seaweed, soil and KH2PO4 occurs which results, at .1 and .5% of seaweed, in a decrease in P fixation. This could be due to the presence of alginates and alginic acids in the seaweed, since these compounds could be binding exchangeable Ca of the soil and therefore diminish P fixation by the Ca‐bonding mechanism.
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