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Effects of tillage intensity on soil C, N, and P pools with different stability
Es ist bekannt, dass die Umsatzdynamik der organischen Substanz von der Bodenbearbeitungsintensität abhängt. Bis jetzt sind nur wenige Daten zum Einfluss der Bearbeitungsintensität und des Zwischenfruchtanbaus auf C-, N-, und P-Dynamik im Ober- (0-5 cm Tiefe) und Unterboden (5-25 cm Tiefe) von Lössböden verfügbar. Hauptziele dieser Arbeit waren die (i) Quantifizierung des Einflusses von verschiedenen langzeitig durchgeführten Bearbeitungssystemen auf labile, intermediäre, und passive C- und N-Pools; (ii) Quantifizierung ...
Effects of grassland renovation on carbon concentrations and aggregate distribution in temperate grassland soils
The effects of continuous tillage on the distribution of soil organic matter (SOM) and aggregates have been well studied for arable soils. However, less is known about the effects of sporadic tillage on SOM and aggregate dynamics in grassland soils. The objectives of the present thesis were (I) to study the longer-term effects of sporadic tillage of grassland on organic carbon (Corg) stocks and the distribution of aggregates and SOM, (II) to investigate the combined effects of sporadic tillage and fertilization on ...
Effects of grassland management intensification on dynamics of soil organic carbon and nitrogen in temperate grassland soils
In Germany, about one third of the agricultural area is managed as permanent grassland. The predominant use of permanent grassland in Germany is mostly the production of fodder for meat or milk production, achieved by grazing or mowing. In addition, an increased demand for biomass to produce renewable energy has influenced grassland management in the last decade. Until 2013, a continuous decrease in grassland due to grassland conversion was recorded (from 2003 to 2013, by a total of about 5 %). The reduction in ...
Application of biogas slurries from energy crops to arable soils and their impact on carbon and nitrogen dynamics
The use of renewable primary products as co-substrate or single substrate for biogas production has increased consistently over the last few years. Maize silage is the preferential energy crop used for fermentation due to its high methane (CH4) yield per hectare. Equally, the by-product, namely biogas slurry (BS), is used with increasing frequency as organic fertilizer to return nutrients to the soil and to maintain or increase the organic matter stocks and soil fertility. Studies concerning the application of energy ...
Effects of fertilizer type and rate on partitioning of soil organic matter into pools of different stability
Type and rate of fertilizers influence the level of soil organic carbon (Corg) and total nitrogen (Nt) markedly, but the effect on C and N partitioning into different pools is open to question. The objectives of the present work were to: (i) quantify the impact of fertilizer type and rate on labile, intermediate and passive C and N pools by using a combination of biological, chemical and mathematical methods; (ii) explain previously reported differences in the soil organic matter (SOM) levels between soils receiving ...