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Nutrient Cycles Nitrogen and Phosphorus. WHY DO WE NEED NITROGEN?? – Nitrogen is needed to make up DNA and protein! In animals, proteins are vital for. - ppt download
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Phosphorus Basics: Deficiency Symptoms, Sufficiency Ranges, and Common Sources - Alabama Cooperative Extension System
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Phosphorus Basics: Understanding Phosphorus Forms and Their Cycling in the Soil - Alabama Cooperative Extension System
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