Calculation Methods of Total Nitrogen and Total Phosphorus Distribution in Pig Manure Fractions

Introduction. The study aims to develop and test a comprehensive calculation methodology in case of pilot pig complexes verify reliability estimates. methods are required for reliable tracking the nutrients flow at farm level adjusting application doses resulting solid liquid organic fertilizers with due account crop rotation place, agrochemical analysis soils, specific crops obtain target yields. Materials Methods. Calculations content total nitrogen phosphorus manure before separation fractions were carried out by developed method. At that, coefficients from corresponding normative documents results previous research used. Samples initial material collected three replications two closed-cycle rearing located Leningrad Region. experimental data statistically processed StatGraphics Centurion v.16 software. Results. calculated nutrient separated was compared laboratory physicochemical composition its selected complexes. difference between average actual values all considered indicators did not exceed 10%, differences turning be much bigger (up 10%) than 5.7%) manure. Discussion Conclusion. identified can explained instrumental uncertainty heterogeneity analyzed ‒ mixture excrement process water. confirmed that method is reliable, it used calculating certain produce expected yield reduce negative impact on environment.