Potassium (K) and magnesium (Mg) are two macro nutrient elements for all crops including rice. Potassium and magnesium deficiencies exist in different rice soils of Malaysia. So application of these nutrients through fertilization is essential to meetthe crop demand. But when a fertilizer containing a nutrient element (including K or Mg) is applied to the soil, a substantial portion of it is absorbed in the soil. The magnitude of adsorption depends on soil properties. Before fertilization program for a nutrient element, an understanding of its adsorption in that soil is necessary to predict the amount of fertilizer to be added. In this regard, research works were conducted at Universiti Putra Malaysia. Some salient information, obtained by conducting research in this area, is reviewed in this paper.
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