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A field experiment was conducted in 2011–2013 in Poland. The objective of this study was to determine the effect of increasing doses of meat and bone meal (MBM) on the mineral nitrogen (Nmin) and available phosphorus (P) content of soil and the soil pH. Changes in the content of NH4 +-N, NO3 --N and available P in soil were affected by MBM dose, weather conditions and crop species. Soil samples were collected each year after the growing season of the main crop. Soil amended with MBM was more abundant in mineral N and available P. The lowest concentration of NO3 --N and the highest concentration of NH4 +-N were noted in the first year of the study. Such low nitrate concentrations in soil resulted from the highest N uptake by maize, and heavy rainfall in July and August which could contribute to nitrate leaching through the soil profile. MBM had no influence on the accumulation of Nmin in soil, whereas the concentration of available P in soil increased significantly throughout the experiment. The soil pH decreased with increasing MBM doses. After the application of the highest MBM doses, soil pH classification was changed from neutral to slightly acidic.

The effect of meat and bone meal (MBM) on the nitrogen and phosphorus content and pH of soil