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Reasons from plant-available nutrient supply, pH-governed availability, and CEC/base saturation through Mehlich-3 extraction, buffer-pH lime calculations with ECCE/ENM, 4R stewardship, and regional extension calibration while treating uncalibrated cross-extractant comparison, no-till stratification, environmental P/nitrate loss, and N mineralization-immobilization leakage as first-class failure modes.