There are many metal elements found in the earth's crust. They are present as part of various minerals or in their elemental form. They are frequently a part of the ores mined to make plant foods.

Homeowners are concerned about these elements because high concentrations of certain forms may cause health problems for children and adults. There is also interest in their impact on wildlife and water resources.

The effect of the presence of these metals in the backyard environment varies due to a number of physical, chemical, and biological factors. Some forms are more soluble than others. Variations can also be the result of the type of clay in the soil, the soil acidity, organic matter content, or the amount of rainfall.

The levels of certain metals associated with plant foods are monitored by state agencies. This information is available to gardeners through the websites listed below.

You can find ingredient information for Rod McLellan company products by using the links and instructions below:

Information supplied by the state of Oregon

Instructions:

• In the center section, click on "Divisions" for a drop-down menu
• Click on "Pesticides Division"
• On left-side navigation bar, click on "Fertilizers"
• In center section, under "Product Registration" heading, click on "Check Product Registration Status"
• In the "Brand Name" box, type "Whitney Farms"

Information supplied by the state of Washington

Instructions:

• On left-side navigation bar, click on "Pesticides and Fertilizers"
• On left-side navigation bar, click on "Commercial Fertilizer"
• On left-side navigation bar, click on "Product Database"
• In center section, click on link to "Search for Fertilizer Products by Product Name"
• Click on the letter "W"
• Scroll down to find the Whitney Farms product of interest

Information supplied by the state of Oregon

Instructions:

• In the center section, click on "Divisions" for a drop-down menu
• Click on "Pesticides Division"
• On left-side navigation bar, click on "Fertilizers"
• In center section, under "Product Registration" heading, click on "Check Product Registration Status"
• In the "Brand Name" box, type "Whitney Farms"

Information supplied by the state of Washington

Instructions:

• On left-side navigation bar, click on "Pesticides and Fertilizers"
• On left-side navigation bar, click on "Commercial Fertilizer"
• On left-side navigation bar, click on "Product Database"
• In center section, click on link to "Search for Fertilizer Products by Product Name"
• Click on the letter "S"
• Scroll down to find the Supersoil product of interest

Information supplied by the state of Oregon

Instructions:

• In the center section, click on "Divisions" for a drop-down menu
• Click on "Pesticides Division"
• On left-side navigation bar, click on "Fertilizers"
• In center section, under "Product Registration" heading, click on "Check Product Registration Status"
• In the "Brand Name" box, type "Black Magic"

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