Abstract
We examined the behavior of coated phosphate and potassium in Andosol. Seedlings of Allium fistulosum L. were grown in Andosol applied with a PK fertilizer and coated fertilizer. In coated PK fertilizer, there are cases where the amount of absorbed phosphate to the plant was enhanced without increasing available phosphate in the soil. This suggests that plants would be able to absorb phosphate from the coated fertilizer directly not via available phosphate in the soil. On the other hand, the eluviation of potassium in coated PK fertilizer was clearly suppressed. Coated phosphate and potassium would be valuable for availability through application to Andosol.
