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Gaseous Nitrogen and Carbon Losses from Pig Manure Derived from Different Diets

^a Alterra, Wageningen University and Research Centre, P.O. Box 47, 6700 AA Wageningen, the Netherlands
^b Department of Soil Quality, Wageningen University and Research Center, P.O. Box 8005, 6700 EC Wageningen, the Netherlands

View larger version (23K): [in a new window]   Fig. 1. Schematic presentation of the different experiments and analyses.

View larger version (33K): [in a new window]   Fig. 2. Time course of N2O fluxes (left figures) and CO2 fluxes (right figures) from the sandy soil (upper figures) and clayey soil (lower figures). Fluxes of the control, NH4NO3 fertilizer, and the manures with the lowest (A for the sand and B for the clay) and highest (I for the sand and F for the clay) total N2O emission are presented. Fluxes of the other manures are within the range of the presented manures.

View larger version (23K): [in a new window]   Fig. 3. Amounts of applied stable and easily mineralizable organic C added to soil by manure at a rate of 100 mg N per kg soil. Easily mineralizable C is defined as the C that mineralized during aerobic incubation for 44 d at 20°C, while stable C is defined as the C that remained after this incubation (see Table 6). The left bars are results for the sandy soil and the right bars for the clay soil.

View larger version (18K): [in a new window]   Fig. 4. Effects of lowered protein content (comparison of Manures B and A), adding acidifying salt (Manures B and D), increasing total nonstarch carbohydrate contents (Manures I and B), and fermentable nonstarch carbohydrate content (Manures E and G) on potential NH3 and CH4 emission during anaerobic storage, denitrification potential (DNP) after soil application, potential N2O emission after application to a sandy and clayey soil, the content of mineral N in the manure, and the content of stable organic matter (OM) in the manure (i.e., the residual organic matter after incubation of manure in soil at 20°C during 44 d).