HIGHLIGHTS
SUMMARY
Under current farming practices, fertilizer N use efficiency (NUE) of both mineral fertilizer and animal manure is low, with N recoveries in crops averaging 42 ± 13% for mineral fertilizer and 26 ± 10% for animal manure in the year of fertilizer application (Smith and Chalk 2018). This leaves a knowledge gap regarding the distribution of either 15N labeled mineral fertilizer or 15N labeled cattle slurry, produced by mixing 15N labeled urine and faeces, into different soil N pools under arable field conditions. Three fertilizer treatments were implemented: 15N labeled mineral fertilizer as 15NH415NO3 (Min, 8 . . .
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