Available Potassium Evaluation of Gharb El-Mawhoob Soils, | ||||
| Assiut Journal of Agricultural Sciences | ||||
| Article 17, Volume 48, 1-1, February 2017, Page 214-228 PDF (828.42 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajas.2016.3743 | ||||
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| Abstract | ||||
| In Garb El-Mawhob area, northwest of El-Dakhla Oasis, New Valley governorate, Egypt, nine transects (≈ 5km away between two consecutive ones) containing 17 soil sites were designated to evaluate the available potassium (K)and its relation with some soil properties. Surface (0-30) and subsurface (30-60) soil samples were collected from each profile, air-dried, ground, sieved and then, kept for some physical and chemical analyses. The obtained results indicated that about 56, 65 and 41% of the total soil samples contained sand, silt and clay respectively of more than 60, 10 and 30%, respectively. The saturation percentage (SP) varied from 25 to 110% and increased whenever the clay or organic matter content increased. The organic matter content differed from 0.01 to 2.48 % and decreased with soil depth. The CaCO3 content of these soils varied from 2.20 to 59.24%. The pH values ranged from 7.44 to 8.03.The electrical conductivity of the soil paste extract (ECe) differed from 0.71 to 171.30 dS/ m with an average value of 20.33dS/ m. The soluble anions could be arranged in the descending order of Cl> SO4 > HCO3. The soluble cations could be arranged in the descending order of Na >Ca> Mg > K. The sodium adsorption ratio of the soil paste extract (SARe) ranged from 0.31 to 85.20. Cation exchange capacity (CEC) values ranged from 6.58 to 62.56 cmol(+)/ kg with a mean value of 29.44 cmol(+)/ kg and it increased with soil depth. The available K ranged from 148.98 to 944.12 mg/ kg with an average value of 451.81 mg/ kg. About 47.06% of the studied soil samples contained a very high level of available K (> 450 mg/ kg),20.56% had a high K level (251-450 mg/ kg), 29.41% showed a moderate K level (151-250 mg/kg) and only 2.94% exhibited a low K level (86-150 mg/ kg). The available K was found to be positively correlated to silt content, clay content, SP, ECe, SARe and CEC as well as soluble Na, Mg, HCO3 and SO4. However, it was negatively correlated to both sand and CaCO3 contents. | ||||
| Keywords | ||||
| available potassium; soil physical-chemical properties; Gharb El-Mawhoob; El-Dakhla Oasis; Egypt | ||||
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