CPAg Practice Questions - Certified Professional Agronomist Exam

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A tissue test from V6 corn shows K at 1.4% (sufficient range 1.7-2.5%) on a CEC 15 cmol/kg silt loam with K soil test 140 ppm. Which management decision is most defensible?

Apply 200 lb K2O/acre broadcast immediately to correct tissue deficiency Ignore the tissue test because soil test K is adequate Investigate root restriction, compaction, and dry topsoil before fertilizing - soil test is adequate and K uptake is diffusion-limited Switch to a foliar K program for the rest of the season

Correct Answer:

Investigate root restriction, compaction, and dry topsoil before fertilizing - soil test is adequate and K uptake is diffusion-limited

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