Fertilizer is composed of ...

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Fertilizer is composed of Nitrogen and Phosphorous with a few other trace nutrients also included. That can easily come from organic fertilizer and Class A sludge from wastewater treatment facilities (I never saw plants grow so fast on the Class A stuff!). However, they do not address the problem of pests. There are a few organic methods of keeping bugs off your crops (diatomaceous earth comes to mind) but we switched to chemical means because the organic sources were not as effective. The problems arise, as stated above, when the dose exceeds the need. You should monitor your runoff for these chemicals to both save you money on application and reduce your impact on the environment.