Assertion: fertilizer's phosphorus | /r/CapableOf | express as potassium
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text: Phosphorus (P, expressed as P 2 O 5 ) and potassium (K, expressed as K 2 O) fertigation recommendations for selected vegetable crops in mineral soils for Florida based on low, medium, and high soil test index using MEHLICH 3 SOIL EXTRACATANT METHOD.