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Soil Science:
doi: 10.1097/SS.0b013e31829cf464
Technical Article

Inorganic and Enzymatically Hydrolyzable Organic Phosphorus of Alabama Decatur Silt Loam Soils Cropped With Upland Cotton

Tazisong, Irenus A.1; He, Zhongqi2; Senwo, Zachary N.1

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Abstract

Abstract: Alabama is a major cotton production state in the USA. In this study, we assessed the impact of soil management practices on phosphorus (P) forms and lability in Alabama Decatur silt loam cropped with cotton. The data indicated that inorganic P in the soils studied was mainly associated with Fe and Al oxides and was not readily bioavailable. On the other hand, elevated levels of water plus Fe and Al inorganic P fractions were observed in soils treated with poultry litter compared to the control and other inorganic fertilized soils. Most of the soil organic P was associated with Al oxide (> 40%) with the exception of the no-till and control treatments where the bulk of the soil organic P was organic matter bound. Water soluble organic P increased after poultry litter applications whereas no increase was observed with inorganic fertilization. Statistical analysis (mean separation) revealed that the phosphatase and phytase hydrolyzed water soluble organic P within each treatment was not significantly different at P < 0.05. More than 50% of organic P in the sequentially-extracted NaOH fraction was hydrolyzable by the various phosphatase enzymes, indicating that NaOH-extractable organic P is labile. Any portion of the organic P extracted in the fractions that was not hydrolyzed by the enzymes is considered to be in the complex forms tightly bound to colloidal and other materials.

© 2013Wolters Kluwer Health | Lippincott Williams & Wilkins

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