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Document Type |
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Article In Journal |
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Document Title |
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Production-ecological modelling explains the difference between potential soil N mineralisation and actual herbage N uptake انتاج نموذج بيئى لشرح الإختلاف بين تعدين التربة بالنيتروجين واستخلاصه بالأعشاب من التربة |
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Subject |
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Enviromental sciences |
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Document Language |
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English |
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Abstract |
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We studied two different grassland fertiliser management regimes on sand and peat soils: above-ground application of a combination of organic N-rich slurry manure and solid cattle manure (SCM) vs. slit-injected, mineral N-rich slurry manure, whether or not supplemented with chemical fertiliser (non-SCM). Measurements of field N mineralisation as estimated from herbage N uptake in unfertilised plots were compared with (i) potential N mineralisation as determined from a standard laboratory soil incubation, (ii) the contribution of groups of soil organisms to N mineralisation based on production-ecological model calculations, and (iii) N mineralisation calculated according to the Dutch fertilisation recommendation for grasslands. Density and biomass of soil biota (bacteria, fungi, enchytraeids, microarthropods and earthworms) as well as net plant N-uptake were higher in the SCM input grasslands compared to the non-SCM input grasslands. The currently used method in Dutch fertilisation recommendations underestimated actual soil N supply capacity by, on average, 102 kg N ha1 (202 vs. 304 kg ha1 = 34%). The summed production-ecological model estimate for N mineralisation by bacteria, fungi, protozoa, and enchytraeids was 87–120% of the measured potential soil N mineralisation. Adding the modelled N mineralisation by earthworms to potential soil N mineralisation explained 98–107% of the measured herbage N uptake from soil. For all grasslands and soil biota groups together, the model estimated 105% of the measured net herbage N uptake from soil. Soil biota production-ecological modelling is a powerful tool to understand and predict N uptake in grassland, reflecting the effects of previous manure management and soil type. The results show that combining production ecological modelling to predict N supply with existing soil N tests using aerobic incubation methods, can add to a scientifically based improvement of the N fertilisation recommendations for production grasslands. |
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ISSN |
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0929-1393 |
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Journal Name |
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Applied Soil Ecology |
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Volume |
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84 |
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Issue Number |
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1 |
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Publishing Year |
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1435 AH
2014 AD |
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Article Type |
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Article |
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Added Date |
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Monday, August 4, 2014 |
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Researchers
| Muhammad Imtiaz Rashid | Rashid, Muhammad Imtiaz | Researcher | | irmaliks@gmail.com |
| Ron G.M. de Goede | de Goede, Ron G.M. | Researcher | | |
| Lijbert Brussaard | Brussaard, Lijbert | Researcher | | |
| Jaap Bloem | Bloem, Jaap | Researcher | | |
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Files
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37279.pdf
| pdf | Production-ecological modelling explains the difference between potential soil N mineralisation and actual herbage N uptake |
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