An Investigation of Phosphorus Dynamics in a Calcareous Soil Treated with Different Levels of Poultry Manure and Chemical Fertilizer

Document Type : Research Paper

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Abstract

Phosphorus (P) is a limited resource in the world and thus its efficient use is a main task in sustainable agriculture.  Organic amendments as excellent sources of P are capable of changing P dynamics in calcareous soils. In the present study, P was added to a calcareous soil at two rates of 100 and 200 mg P kg-1soil from two sources of triple super phosphate (CF) and poultry manure (PM), separately. A treatment with no amendment was considered as a control.  The samples were incubated for 3, 120, 360, 720, 1080, 1440 and 2160 hrs and P release was determined after each incubation period. Several kinetic equations were fitted to the P release data and their slopes were determined as P transformation rates in the soil. In the soil treated with poultry manure, P release increased up to 1440 hrs and then it showed a decreasing trend to 2160 hrs. The P release in soil treated with chemical P fertilizer followed a decreasing trend as at the end of incubation, 75 and 81% of added P became non-extractable in soil treated with 100 and 200 mg P kg-1soil, respectively. Based on the P transformation rate indices, transformation power of the soil treated with poultry manure and chemical P fertilizer was different. It seems that in the soil, chemical P fertilizer should be applied in smaller and more frequent applications rather than one application. Since P release has decreased in the PM amended soil, it is also recommended to study the effects of poultry manure and chemical P fertilizer co-application.  

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References

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Water and Soil Science
Volume 26, Issue 3 - Serial Number 3
December 2016
Pages 293-303

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