En 2009, six traitements (fumier frais et vieux fumier, fumier de porcs et fumier de volaille, foin de luzerne et paille plus 200 kg de P par hectare) avaient donné un rendement cumulatif similaire (–6,5 à –19,5%) à celui de la parcelle témoin qui avait conservé son sol de surface et n'avait pas été bonifiée.
Au printemps de 1992, les auteurs ont appliqué à une reprise divers amendements (20 Mg par hectare en poids sec) à un sol privé de sa surface (∼15cm retirés mécaniquement pour simuler l’érosion) qu'ils ont par la suite ensemencé annuellement avec du blé de printemps ( Triticum aestivum L.).
On recourt largement aux amendements organiques pour atténuer la détérioration du sol résultant de l’érosion. Effets résiduels d'une application unique de fumier, de déchets de culture ou d'engrais sur un sol privé de sa surface. Results demonstrated that while drastically disturbed soils may recover productivity in the absence of organic amendments (e.g., eroded check treatment), organic amendments play a residual role in their ongoing maintenance. Residual amendment effects on total nitrogen (N) and phosphorus (P) were apparent 11.5 yr after application. Soil organic carbon (SOC) accrued on all treatments over time, increasing significantly from an average of 12.2 g kg −1 in 1992 to 13.2 g kg −1 (0–15 cm depth) in 2003. Most (8 of 13) amendment treatments showed significant power function relationships between cumulative grain yield (expressed as a percent of topsoil check) and time while two (hog and poultry manure) were quadratic. By 2009, six treatments (fresh and old cattle manure, hog and poultry manure, alfalfa ( Medicago sativa L.) hay and straw+200 kg P ha −1) had cumulative yields which were not significantly different (−6.5 to −19.5%) from the topsoil check treatment (no topsoil removed, no amendment). In spring 1992, a desurfaced soil (∼15 cm depth mechanically removed to simulate erosion) received one-time applications of amendments (20 Mg ha −1 dry wt), and was subsequently seeded annually to spring wheat ( Triticum aestivum L.). Organic amendments are often used to mitigate the effects of soil degradation caused by erosion. Residual effectsof one-time manure, crop residue and fertilizer amendments on a desurfaced soil.