Because of regulatory standards set to remove “free” sulfur-dioxide gas from the atmosphere, growers across North America have had to begin adding S to their fertilizer purchases
Over the past 25 years the traditional macronutrient trio, nitrogen (N), phosphorus (P) and potassium (K) has slowly begun to share its NPK analysis shorthand with what has become a fourth “major” crop nutrient — sulfur (S).
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