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Fig. 8. Relationships between soil (a) NO₃–N, (b) P, and (c) K determined by Kelowna solution and ion-selective electrodes (ISEs), and by standard extractants and an automated ion analyzer (Lachat) for N and inductively coupled Ar plasma (ICP) spectrometer for P and K. Data are presented as mean and standard deviation; however, regression equations and statistics were calculated using individual data points.