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https://hdl.handle.net/2440/79862
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Type: | Journal article |
Title: | Organic amendments differ in their effect on microbial biomass and activity and on P pools in alkaline soils |
Author: | Malik, M. Khan, K. Marschner, P. Ali, S. |
Citation: | Biology and Fertility of Soils, 2013; 49(4):415-425 |
Publisher: | Springer-Verlag |
Issue Date: | 2013 |
ISSN: | 0178-2762 1432-0789 |
Statement of Responsibility: | Muhammad Asghar Malik, Khalid Saifullah Khan, Petra Marschner, Safdar Ali |
Abstract: | Organic amendments could be used as alternative to inorganic P fertilisers, but a clear understanding of the relationship among type of P amendment, microbial activity and changes in soil P fractions is required to optimise their use. Two P-deficient soils were amended with farmyard manure (FYM), poultry litter (PL) and biogenic waste compost (BWC) at 10 g dw kg⁻¹ soil and incubated for 72 days. Soil samples were collected at days 0, 14, 28, 56 and 72 and analysed for microbial biomass C, N and P, 0.5 M NaHCO3 extractable P and activity of dehydrogenase and alkaline phosphomonoesterase. Soil P fractions were sequentially extracted in soil samples collected at days 0 and 72. All three amendments increased cumulative CO₂ release, microbial biomass C, N and P and activity of dehydrogenase and alkaline phosphomonoesterase compared to unamended soils. The increase in microbial biomass C and N was highest with PL, whereas the greatest increase in microbial biomass P was induced with FYM. All three biomass indices showed the same temporal pattern, with the highest values on day 14 and the lowest on day 72. All amendments increased 0.5 M NaHCO₃ extractable P concentrations with the smallest increase with BWC and the greatest with FYM, although more P was added with PL than with FYM. Available P concentrations decreased over time in the amended soils. Organic amendments increased the concentration of the labile P pools (resin and NaHCO₃-P) and of NaOH-P, but had little effect on the concentrations of acid-soluble P pools and residual P except for increasing the concentration of organic P in the concentrated HCl pool. Resin P and NaHCO₃-P(i) pools decreased over time whereas NaOH-P(i) and all organic P pools increased. It is concluded that organic amendments can provide P to plants and can stimulate the build-up of organic P forms in soils which may provide a long-term slow-release P source for plants and soil organisms. |
Keywords: | Available P CO2 release Compost Enzyme activity Farmyard manure Microbial biomass Poultry litter |
Rights: | Copyright status unknown |
DOI: | 10.1007/s00374-012-0738-6 |
Published version: | http://dx.doi.org/10.1007/s00374-012-0738-6 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
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