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.
Khider, M. H. (2006). POTASSIUM STATUS AND ITS EXTRACTION FREE ENERGY IN SOME NEWLY RECLAIMED SOILS AT UPPER EGYPT. Fayoum Journal of Agricultural Research and Development, 20(2), 211-215. doi: 10.21608/fjard.2006.197601
MLA
Magdy H. Khider. "POTASSIUM STATUS AND ITS EXTRACTION FREE ENERGY IN SOME NEWLY RECLAIMED SOILS AT UPPER EGYPT". Fayoum Journal of Agricultural Research and Development, 20, 2, 2006, 211-215. doi: 10.21608/fjard.2006.197601
HARVARD
Khider, M. H. (2006). 'POTASSIUM STATUS AND ITS EXTRACTION FREE ENERGY IN SOME NEWLY RECLAIMED SOILS AT UPPER EGYPT', Fayoum Journal of Agricultural Research and Development, 20(2), pp. 211-215. doi: 10.21608/fjard.2006.197601
VANCOUVER
Khider, M. H. POTASSIUM STATUS AND ITS EXTRACTION FREE ENERGY IN SOME NEWLY RECLAIMED SOILS AT UPPER EGYPT. Fayoum Journal of Agricultural Research and Development, 2006; 20(2): 211-215. doi: 10.21608/fjard.2006.197601
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