Table 1.2-3. Optimum levels used to interpret the Mehlich 3 soil test for agronomic crops in Pennsylvania.
|Soil test||Optimum Range||Comments|
|Phosphorus (P)||30–50 ppm||All agronomic crops.|
|pH||6.0–7.0||A pH of 6.0–6.5 is considered adequate for most agronomic crops; however, 6.5–7.0 is recommended for alfalfa and barley.|
|Magnesium (Mg)||120–180 ppm
|Grass forage crops
Other agronomic crops
|Potassium (K)||100–150 ppm