Awad, M., El-Desoky, M., Roshdi, N., Tantawy, M. (2016). Potassium Forms of EL-Dakhla Oasis Soils, New Valley Governorate, Egypt. Journal of Soil Sciences and Agricultural Engineering, 7(12), 947-954. doi: 10.21608/jssae.2016.40558
M. Awad; M. El-Desoky; Nadia Roshdi; M. Tantawy. "Potassium Forms of EL-Dakhla Oasis Soils, New Valley Governorate, Egypt". Journal of Soil Sciences and Agricultural Engineering, 7, 12, 2016, 947-954. doi: 10.21608/jssae.2016.40558
Awad, M., El-Desoky, M., Roshdi, N., Tantawy, M. (2016). 'Potassium Forms of EL-Dakhla Oasis Soils, New Valley Governorate, Egypt', Journal of Soil Sciences and Agricultural Engineering, 7(12), pp. 947-954. doi: 10.21608/jssae.2016.40558
Awad, M., El-Desoky, M., Roshdi, N., Tantawy, M. Potassium Forms of EL-Dakhla Oasis Soils, New Valley Governorate, Egypt. Journal of Soil Sciences and Agricultural Engineering, 2016; 7(12): 947-954. doi: 10.21608/jssae.2016.40558
Potassium Forms of EL-Dakhla Oasis Soils, New Valley Governorate, Egypt
1Department of Soils and Water, Faculty of Agriculture, Al-Azhar University, Assiut, Egypt
2Department of Soils and Water, Faculty of Agriculture, Assiut University, Egypt
Abstract
Thirty surface and subsurface soil samples were collected from 15 sites of El- Dakhla soils, Egypt to study the status of soil potassium forms and their relationship with the physical and chemical properties of these soils. The results indicated that the investigated soil samples showed a wide variation in soil potassium forms. This variation depended upon clay, silt and sand contents as well as soil properties. The soluble K form values ranged from 4.7 to 1332 mg/kg and the exchangeable K form differed from 5.37 to 1368.80 mg/kg. However, the non-exchangeable K form varied from 0.3 to 4.2 g/kg and the total K varied from 2.3 to 19.89 g/kg. The residual K extended from 0.9 to 17.4 g/kg. Generally, about 16.66 % of studied samples were very low in the exchangeable K form. The samples which had a moderate exchangeable K content represented 13.33% of the investigated samples. Also, about 20% of these samples were high in their content of exchangeable K. The very high exchangeable K content represented 40% of the investigated samples. The ECe value had no respectable effects on the soluble K form but, a slight effect was observed in the other K forms. This effect increased in the residual K form. The OM content more than 1% had no remarkable effects on the soluble or exchangeable K forms. However, a clear effect was observed on the residual K form. Generally, all potassium forms had highly significant positive correlations with each other and with organic matter and pH. Also, all forms except the soluble K form showed highly significant negative correlations with calcium carbonates and sand content.
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