Spatio-temporal dynamics of pig manure-derived P reacting with soil were monitored.
Over time, P availability in manure solids decreased, but increased in manure char.
CO2 respiration in manure solids-amended soil was higher than in char-amended soil.
Both, manure solids and char derived P remained very localised P sources.
Hence, high P uptake efficiency depends on manure or char placement close to roots.