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https://hdl.handle.net/2440/73091
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Type: | Journal article |
Title: | Addition of organic and inorganic P sources to soil - Effects on P pools and microorganisms |
Author: | Malik, M. Marschner, P. Khan, K. |
Citation: | Soil Biology and Biochemistry, 2012; 49(0):106-113 |
Publisher: | Pergamon-Elsevier Science Ltd |
Issue Date: | 2012 |
ISSN: | 0038-0717 1879-3428 |
Statement of Responsibility: | Muhammad Asghar Malik, Petra Marschner, Khalid Saifullah Khan |
Abstract: | Phosphorus deficiency is wide-spread due to the poor solubility of soil P and the rapid formation of poorly available P after P addition. Microbes play a key role in soil P dynamics by P uptake, solubilisation and mineralisation. Therefore a better understanding of the relationship between type of P amendment, microbial activity and changes in soil P pools is important for a better management of soil P. A P deficient soil was amended with two composts (low P or high P), two crop residues (low P or high P), and inorganic P (KH₂PO₄) at low and high P, and incubated for 56 days. Composts were added at 20gkg⁻¹ resulting in a total P addition of 4.1mgkg⁻¹ soil with the low P compost and 33.2mgkg⁻¹ soil with the high P compost. The same amount of P was added with the other amendments (residues and inorganic P). All amendments increased cumulative respiration, but microbial biomass and the abundance of bacteria and fungi (assessed by phospholipid fatty acid analysis) increased significantly only in soils with organic amendments, with greater increases with residues. The concentration of the inorganic P pools NaHCO₃-Pᵢ, NaOH-Pᵢ and HCl-P increased significantly within 5h after amendment, particularly with high P amendments. Over the following 56 days, labile inorganic P was converted mainly into non-labile inorganic P with inorganic P addition whereas labile and non-labile organic P was formed with organic amendments. It is concluded that organic P sources, particularly those with high P concentration can stimulate the formation of organic P forms in soils which may provide a long-term slow release P source for plants and soil organisms. |
Keywords: | Compost Inorganic P Microbial biomass Organic P P pools Residues |
Rights: | Copyright © 2012 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.soilbio.2012.02.013 |
Published version: | http://dx.doi.org/10.1016/j.soilbio.2012.02.013 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
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