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| | Fertilizer - Encyclopedia, History, Geography and Biography |
 | | They can be naturally-occurring compounds such as peat or mineral deposits, or manufactured through natural processes (such as composting) or chemical processes (such as the Haber process). |
 | | Fertilizers typically provide, in varying proportions, the three major plant nutrients (nitrogen, phosphorus, and potassium), the secondary plant nutrients (calcium, sulfur, magnesium), and sometimes trace elements (or micronutrients) with a role in plant nutrition: boron, manganese, iron, zinc, copper and molybdenum. |
 | | It can also be used in the Odda Process to produce compound fertilizers such as 15-15-15. |
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