ASSESSMENT OF PHOSPHORUS DESORPTION IN I SOME FULVIC ACID-TREATED EGYPTIAN SOILS | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 6, Volume 28, Issue 5, May 2003, Page 4153-4168 PDF (2.02 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2003.244614 | ||||
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| Authors | ||||
| A. Zaghloul,1; M. A. Abou-Seeda2; H. I. EI-Aila2 | ||||
| 1Soils and Water Use Dept. National Res. Centre, Dokki, Giza, gypt. | ||||
| 2Plant Nutrition Dept. National Res. Centre, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| Kinetic of phosphate release in soils has drown a co siderable attention in recent years. Soluble organic matter plays an important part in phosphate release. Effect of fulvic acid (FA) on phophate desor tion was investigated. Results reve~led that power function (modified Freun lich), two sities and zero-order kinetic equations gave a highly significant (R2) mostly in all cases in different treatments of monoca/cium phosphate (MCP) and (FA) treated soils. It was observed that rate coefficients of phophate desorption (Kd) in sandy soil were gradually increased with P.fertilizer added as compared with other treatments. Results also revealed that application of fulvic acid to soil decreased the P-desorption particularly in alluvial soil. FuMc acid treated soil resulted in a reduction of P-desorption and also reg lated the releaseable fraction of phophorus in soils. It was noticed that for he entire reaction period, alluvial clay soil can be able to supply P to cultivated media as compared with other investigated soils. Results also showed that the supplying power of FA treated soils was almost emphasized over the uncoated SP treated soils. These result may be related to the role of FA for increasing the supplying power due to chelation reaction. | ||||
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