INFLUENCE OF SOME ENVIRONMENTAL FACTORS ON RELEASE OF POTASSIUM FROM FELDSPAR ROCK | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 4, Volume 28, Issue 3, March 2003, Page 2445-2451 PDF (1.41 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2003.244107 | ||||
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| Author | ||||
| I. S. Rahim, | ||||
| Solis and Water Use Oept" National Research Center, Cairo, Egypt. | ||||
| Abstract | ||||
| The selected feldspar rock for thl~ investigation is well known as orthoclase sediment at Gebel Rod Ashap. It is estimated that the reserves of this d posit are about 1.2 mUlion Ion. This deposit is slightly alkaline. low salinity and almost free of gypsum and carbonates accumulations. The total potassium content Is relatively high (7.14%). ThIs sediment Includes several members of feldspars. The heavy ",etals (Ni, Pb) in this st!dlment are very rare. The results indicated that the i~CI'e se of the concentration of water soluble potassium aiter 1 day is very distinct (from 890 to 1580 ppm). However, continuous increment of solubility, but in lower rate until the 7 1!l day. Also the exchangeable potassium enhanced fTom 2590.0 ppm to 3600.0 ppm after 7 days. The water,soluble potassium reached the maximum (1080.0 ppm) at 4S'C and decreased at higher temperatures. While the exchangeable form of potassium has slight increase until 60~C. Re9arding the influence of pH, II is found that increasing pH raven the 50Iubilily of potassium and the maximum value (695.0 ppm) was t pH 6.0. However, the addition of feldspar rock to the soil to obtain the adequate concentration of water soluble potassium, refer to the rate of 7% resulted in 550.2 ppm 9' soluble potassium. However, the rate of 5% gave 310.2 ppm of water soluble potaasiurn and 390.0 ppm of eXChangeable which is conSidered as a beneficial concentration for potassium supply In the soil. According to these results it can be recomme ded that the feldspar rock can SUbstitute the application of chemical potassium fertilizers, which is economically quite expensive. | ||||
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