CPAg Practice Questions - Certified Professional Agronomist Exam

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A Mehlich-3 soil test returns 18 ppm P on a silt loam with a target of 25 ppm for corn. If plow-layer bulk density is 1.3 g/cm3 to 6 inches, approximately how many lb P2O5/acre are needed just to build the soil test by 7 ppm (using the common rule of ~9 lb P2O5 per 1 ppm build)?

32 lb P2O5/acre 63 lb P2O5/acre 90 lb P2O5/acre (approximately) 180 lb P2O5/acre

Correct Answer:

90 lb P2O5/acre (approximately)

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