2.2 Key Drivers for P Use Efficiency (PUE)
Based on consultation with experts and the previous work studying drivers of nutrient use (Dinda 2004, Zhang et al. 2015a, Zhang et al. 2015b, Ju et al. 2016, Wu et al. 2018), we considered and examined the relationships between PUE and multiple potential drivers, including eight socio-economic drivers and seven agronomic drivers (Table 1, Table S11).
Table 1 Selected PUE drivers, data sources, and methodology.