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Changes in Soil Nitrogen and Phosphorus under Different Broiler Production Systems

Institute of Plant Nutrition and Soil Science, Federal Agricultural Research Center (FAL), Bundesallee 50, D-38116 Braunschweig, Germany

View larger version (40K): [in a new window]   Fig. 1. Differentiation of mineral nitrogen (Nmin) in different zones of use (as indicated by Zones 1–4) in the free-run soils of conventional free-range (F) and organic (O) broiler farms, 0- to 90-cm sampling depth (O2: 0–30 cm). Significant differences in the 0- to 30-cm soil depth at a particular date are marked with letters. Different scales are due to different orders of magnitude.

View larger version (20K): [in a new window]   Fig. 2. Nitrate N concentrations in the topsoil (0–30 cm) of four free-run soils (F = conventional free-range farm, O = organic farm) as a function of NO3–N concentrations in the 0- to 10-cm sampling depth.

View larger version (71K): [in a new window]   Fig. 3. Development of spatial variability of phosphorus extracted with calcium-acetate-lactate (PCAL) concentration in mg/kg (0–10 cm) in the free run of Farm F1. Zone 1/2 is shaded in dark gray, Zone 3/4 in light gray; data were grouped into classes by cluster center analysis and classes are indicated by dot size.

View larger version (44K): [in a new window]   Fig. 4. Development of phosphorus extracted with calcium-acetate-lactate (PCAL) in free-run soils (F = conventional free-range farm, O = organic farm) for the total area and separated by frequency of use (as indicated by Zones 1 to 4), 0- to 10-cm sampling depth. Significant differences between zones of use at a particular date are marked with letters.