3.2 Nutrient use efficiencies (NUE)
The NUEs of N, P, and K in the two counties decreased from 1992 to 2007
(Fig. 3). The NUE decrease in Meixian County was higher than that in
Wugong County. NUE of N and P was 45-70% and 32-49% in Wugong and
19-35% and 20-47% in Mexian, respectively. While the NUE of K in
Wugong and Meixian was 74-137% and 31-96%, respectively.