| 摘要 |
PROBLEM TO BE SOLVED: To produce a potash fertilizer having a good slow-acting property regardless of components exclusive of K2O. SOLUTION: This slow-acting potash fertilizer consists essentially of K2O, SiO2 and CaO and contains Al2O3, MgO, MnO and Fe2O as selective components. The content of K2O thereof is below the threshold at which the ratio of water- soluble K2O rises.
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