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Fig. 7. Relationships between soil (a) NO3–N, (b) P, and (c) K extracted with Kelowna and with standard extractants, i.e., 1 mol L–1 KCl for N and Mehlich III for P and K extraction, using an automated ion analyzer (Lachat) for N and inductively coupled Ar plasma (ICP) spectrometer for P and K.
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