Effect of Organic Amendments on Potassium Dynamics in soils

Mineral and organic amendments are applied to the newly reclaimed soils in Egypt, especially sandy and calcareous sandy soils. T hese soils are very poor in organic matter and nutrients that are necessary for plants. So, the addition of organic amendments to these soil s does not only improve the physical and chemical properties, but also applying t hese organic materials has a positive impact on the forms of potassium, especially in calcareous sandy soils . This study aims to evaluate the application effects of a mineral fertilizer (K2SO4 ) and certain organic amendments (filter mud cake, sheep manure and poultry manure) on the Q/I relation of soil K and its parameters as well as forms of potassium of clay and calcareous sandy s oils. The effects of these amendments on some chemical properties of these soils and K uptake by some crops are also examined.