THE ROLE OF   GYPSUM CONTENT  IN PHOSPHORUS  FORMS  IN  GYPSIFEROUS  SOIL

K. T. Al-Hooni, Saleh; M. Mhawish, Noor-Addien

	THE ROLE OF GYPSUM CONTENT IN PHOSPHORUS FORMS IN GYPSIFEROUS SOIL
Journal of Tikrit University For Agriculture Sciences
Article 1, Volume 14, Issue 2, 2014, Pages 241-249
Authors
Saleh K. T. Al-Hooni; Noor-Addien M. Mhawish
Abstract
This study was conducted to assess the effect of gypsum content on mineral phosphorus (P) forms (total , mineral and organic). Fractionation of mineral phosphorus to its different forms was done for the three samples of soils diffened in its gypsme contant ( 4.6 , 14.8 ,24.4 %) and differed in its chemical and physical properties . Results of the study showed that total P values were ( 612.52 , 862.51 and 646.80 ) amalgam p . Kg -1 soil for the three samples respectively . Mineral phosphorus and valued ( 546.66 , 748.25 , 526.72 ) amalgam p . Kg -1 for the soils samples respectively of mineral phosphorus out of total more ( 89.25 , 86.75 and 81.42 %) percentages of mineral P fractions out of total mineral P renged between (0.21 -0.36 ) % for surface phosphate, (3.85 - 6.33 ) % phosphate aluminum , (1.16 - 1.27 ) % for iron phosphate, (81.69 - 85.86 ) % for calcium phosphate , (8.91 - 10.35) %for reductant soluble iron P . calcium phosphate constituteal the greatest fraction of mineral phosphorus with values reached (430.30 , 642.42 , 460.60) amalgam p . Kg -1 soil .which assure the role of calcium in mineral phospotal p amount and mineral p amount with values reached (120.16 , 114.26 , and 65.86) mg p.kg-1 soil, for the three samples , resples, respectively.
Keywords
Gypsum; phosphorus forms

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