POTASSIUM STATUS AND ITS EXTRACTION FREE ENERGY IN SOME NEWLY RECLAIMED SOILS AT UPPER EGYPT | ||
| Fayoum Journal of Agricultural Research and Development | ||
| Article 17, Volume 20, Issue 2, July 2006, Pages 211-215 PDF (388.5 K) | ||
| Document Type: Research articles. | ||
| DOI: 10.21608/fjard.2006.197601 | ||
| Author | ||
| Magdy H. Khider | ||
| Soils, Water and Environ. Institute, Agric. Res. Center, Giza, Egypt | ||
| Abstract | ||
| Eight surface soil samples (0-30 cm) were selected from some newly reclaimed soils at Kom Ombo and Halaib & Shalateen areas, Upper Egypt, Egypt to identify K status and free energy of extracted K amounts. The obtained data reveal that the amounts of soluble and exchangeable K ranged between 0.006-0.286 and 0.12-1.65 m molc/100 g soil, respectively. Also, the corresponding K amounts take place a similar parallel trend to each of soil salinity level and the content of clay fraction, respectively. The CaCl2 extractable K contents from the soil samples under consideration ranged between 0.39-0.13 and 0.05-0.02 me/100 g soil at the first and last extractions, respectively. These obtained data show a greater depletion between the fine and coarse textured soils. In addition, free energy values (Δ F) of K extractions were calculated, and the obtained results indicate that the released K amounts from the studied soils are insufficient to cover K requirements for grown plants, and in turn these soils are in need to be fertilized with K, particularly upon the prevailing extensive cropping patterns. | ||
| Keywords | ||
| K status; free energy of extracted K; soils of Upper Egypt | ||
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