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Fertilizer and residue quality effects on organic matter stabilization in soil aggregates
| Content Provider | Consultative Group on International Agricultural Research (CGIAR) |
|---|---|
| Author | Fonte, Steven J. Yeboah, E. Ofori, P Quansah, GW Vanlauwe, Bernard Six, Johan |
| Spatial Coverage | Ghana [GH] |
| Description | This study examined the influence of organic residue quality and N fertilizer on aggregate-associated SOM in maize cropping systems of southern Ghana. Six residue treatments of differing quality (Crotalaria juncea, Leucaena leucocephala, maize stover, sawdust, cattle manure and a control with no residues added) were applied at 4 Mg C ha-1 yr-1 both with and without fertilizer N additions (120 kg N ha-1 season-1). Soils (0-15cm) were sampled three years after study implementation and wet sieved into four aggregate size classes (8000–2000, 2000– 250, 250–53, and <53 ?m). Small macroaggregates (2000–250 ?m) were further separated into coarse particulate organic matter (>250 ?m), microaggregates within macroaggregates (53-250 ?m), and macroaggregate occluded silt and clay (<53 ?m). N fertilizer additions reduced aggregate stability as was evident from a 40% increase in the weight of the silt and clay fraction (P= 0.014) as well as a decrease in microaggregates across all residue types (P = 0.019). Fertilizer similarly affected C and N storage within these aggregate fractions, while effects of residue quality were largely insignificant. Our results suggest that fertilizer effects on soil aggregation may have important implications for long-term SOM dynamics. |
| Related Links | https://cgspace.cgiar.org/items/b8fdfd20-a412-4cc1-81b8-98d0522e8220 |
| File Format | |
| ISSN | 14350661 |
| Journal | Soil Science Society of America Journal |
| Language | English |
| Publisher Date | 2009-01-01 |
| Access Restriction | Open |
| Subject Keyword | Maize Soil Organic Matter Crotalaria Juncea Leucaena Leucocephala Nitrogen Fertilizers Soil Fertility Cropping Systems Maíz Materia Orgánica Del Suelo Abonos Nitrogenados Fertilidad Del Suelo Sistemas De Cultivo Farming Systems Soil Health Soil Information |
| Content Type | Text |
| Resource Type | Article |
| Subject | Agronomy and Crop Science Food Science Plant Science |
