Nitrogen concentrations, pH and dry matter in slurries(amberger et al. 1982) Source ph Dry matter TotalNI NH NO, Mineralizable n in g/kg fresh matter g/100g dry matter of total organic N Cattle 7 62 4.4 1.9 Trace Pig 523 8.6 5.7 Trace poultry 7. 4.trace 772
Nitrogen concentrations, pH and dry matter in slurries (Amberger et al. 1982) pH Total N NH4 + NO3 - Source Dry matter g/kg fresh matter g/100g dry matter Mineralizable N in % of total organic N Cattle 7.5 62 4.4 1.9 Trace 27 Pigs 7.2 49 8.6 5.7 Trace 17 poultry 7.3 193 7.1 4.8 trace 22
Parameters of affecting the Nh volatilization The pH of slurries is >7 which means that the NH4t-N present is susceptible to volatilization Which may range from a few to 99% 1. Quantity of slurry applied 2 Soil surface in relation to infiltration rate (bare, covered with straw, grassland) 3. Type of slurr 4. Technique of application(injection, or broadcast Rainfall during application
▪ The pH of slurries is >7 which means that the NH4 + -N present is susceptible to volatilization which may range from a few % to 99%. ▪ 1. Quantity of slurry applied ▪ 2. Soil surface in relation to infiltration rate (bare, covered with straw, grassland) ▪ 3. Type of slurry ▪ 4.Technique of application (injection, or broadcast) ▪ Rainfall during application Parameters of affecting the NH4 +volatilization
Rates of Manure for Nitrogen Needs The easily mineralizable organic nitrogen in soil is increased with increasing rates of slurry The easily availability N fraction of manure consist mainly of inorganic n(ammonium, nitrate) urea, and peptide
▪ The easily mineralizable organic nitrogen in soil is increased with increasing rates of slurry. ▪ The easily availability N fraction of manure consist mainly of inorganic N (ammonium, nitrate), urea, and peptide. Rates of Manure for Nitrogen Needs
Rates of Manure for Nitrogen Needs The release of available nitrogen from the complete organic compounds during manure decomposition is very gradual. This slow release of nitrogen is manure's most important asset优点.t extends nitrogen availability and reduces leaching--of particular importance in sandy soils
Rates of Manure for Nitrogen Needs The release of available nitrogen from the complete organic compounds during manure decomposition is very gradual. This slow release of nitrogen is manure‘s most important asset优点. It extends nitrogen availability and reduces leaching -- of particular importance in sandy soils
Rates of Manure for Nitrogen Needs Most of the organic nitrogen compounds n farmyard manure are resistant to decomposition and only become slowy available over longer periods About one-third of the total n is easil released and available in the season of application( Cooke 1972)
▪ Most of the organic nitrogen compounds in farmyard manure are resistant to decomposition and only become slowly available over longer periods. ▪ About one-third of the total N is easily released and available in the season of application (Cooke 1972) Rates of Manure for Nitrogen Needs