NPK fertilizers

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NPK fertilizers include products applied to soil or plants in order to supply nitrogen, phosphorous, and potassium. This article is a comparison of the heavy metal concentrations in the NPK fertilizer products, as reported to the Oregon Department of Agriculture (ODA) and Washington State Department of Agriculture (WSDA). The analyses from the WSDA show the quantities of heavy metals, in parts per million (ppm), of arsenic (As), cadmium (Cd), cobalt (Co), mercury (Hg), molybdenum (Mo), nickel (Ni), lead (Pb), selenium (Se), and zinc (Zn) present in a sample of the product. Analyses from the ODA show the quantities of arsenic (As), cadmium (Cd), mercury (Hg), nickel (Ni), and lead (Pb) present in a sample of the product.

WikiFootprints is not an official source of this information and may not represent the most recent analysis of a product. The date the information was last retrieved from the ODA and WSDA can be found on the detailed product page of each product. Official data can be obtained from the Oregon Department of Agriculture Fertilizer Program website and the Washington State Department of Agriculture Fertilizer Product Database website. Links to the sources of this information can be found in the references section of each individual product page. The name of each product in the table on this page links to the product pages.

NPK Fertilizer Metal Content Analyses[edit]

The following abbreviations or symbols are used in the table below: As (Arsenic), Cd (Cadmium), Co (Cobalt), Hg (Mercury), Pb (Lead), Mo (Molybdenum), Ni (Nickel), Se (Selenium), Zn (Zinc)

Fertilizer metal concentrations (ppm)
 OregonWashington
ProductAsCdPbHgNiAsCdCoPbHgMoNiSeZn
Alaska Fish Fertilizer < 10 < 5 < 5 < 0.2 < 5 2.6 0.1 0.2 1.2 0.05 1 2.1 5.5 14.7
EcoScraps All-Purpose Plant Food < 0.401 < 0.2 0.3 0.801 < 0.0204 1.2 3.8 < 0.602 88
EcoScraps Azalea Camellia and Rhododendron Plant Food 0.585 < 0.228 0.409 2.25 < 0.0204 0.931 3.79 < 0.685 89.1
EcoScraps Berry Plant Food 0.585 < 0.228 0.409 2.25 < 0.0204 0.931 3.79 < 0.685 89.1
EcoScraps Herbs and Leafy Greens Plant Food < 0.401 < 0.2 0.3 0.801 < 0.0204 1.2 3.8 < 0.602 88
EcoScraps Rose and Flower Plant Food < 0.487 < 0.243 0.379 1.09 < 0.0201 1.41 5.93 < 0.73 93.6
EcoScraps Tomato Herb and Vegetable Plant Food < 0.429 < 0.214 0.402 1.28 0.0028 0.979 3.65 1.08 165
Espoma Garden Food 10-10-10 < 3 < 2 < 5 < 0.2 86.3 3.49 1.8 5 11 0.2 5 38 0.31 20
Espoma Garden Food 5-10-5 4.24 < 2 < 5 < 0.2 94.9 1 2 5 5 0.2 5 10 2 20
Espoma Garden-tone 3-4-4 < 10 < 5 < 5 < 0.2 16 3 < 1 < 5 < 5 < 0.4 < 5 20 2.1 245
Espoma Holly-tone 4-3-4 2 1 6 0.2 5 2 < 1 < 5 6 < 0.2 < 5 < 5 2 474
Espoma Plant-tone 5-3-3 9.17 1 13 0.2 12 9.17 0.2 < 5 13 0.2 5 12 0.6 237
Miracle-Gro Water Soluble All Purpose Plant Food 20-20-20 < 10 < 5 < 5 < 0.2 < 5 < 0.656 < 0.328 1.21 < 0.328 < 0.0131 6.04 0.659 < 0.987 575
Miracle-Gro Water Soluble All Purpose Plant Food 24-8-16 < 0.63 < 0.315 4.15 < 0.0283 < 0.479 0.875 0.0583 0.15 0.15 0.0058 0.29 0.511 0.875 782
Miracle-Gro Water Soluble Azalea Camellia Rhododendron Plant Food 30-10-10 < 0.791 < 0.395 0.59 < 0.0166 0.53 0.25 < 1 < 5 < 5 < 0.02 5.6 < 2.5 < 0.25 1,260
Miracle-Gro Water Soluble Bloom Booster Flower Food 10-52-10 0.428 < 0.132 < 0.132 < 0.0104 0.305 5.1 < 1 < 2.5 0.25 < 0.02 3.4 < 2.5 < 1 30
Miracle-Gro Water Soluble Bloom Booster Flower Food 15-30-15 0.598 0.353 0.403 < 0.0408 7.32 1.53 0.303 1.5 1.5 0.006 7.5 1.52 1.52 937
Miracle-Gro Water Soluble Miracid Plant Food 30-10-10 1.78 0.355 1.8 1.8 0.0071 6.1 1.78 1.78 1,320
Miracle-Gro Water Soluble Orchid Food 30-10-10 < 1.78 < 0.355 < 1.8 < 0.0071 < 1.78 1.78 0.355 1.8 1.8 0.0071 6.1 1.78 1.78 1.78
Miracle-Gro Water Soluble Rose Plant Food 18-24-16 < 10 < 5 < 5 < 0.2 < 5 0.56 < 1 < 5 < 5 < 0.02 5.1 < 2.5 < 0.5 957
Miracle-Gro Water Soluble Tomato Plant Food 18-18-21 13 < 5 8.3 < 0.2 < 5 0.39 < 1 < 5 < 5 < 0.02 5.3 < 2.5 < 0.5 676
Miracle-Gro Watering Can Singles 24-8-16 < 0.337 < 0.168 0.3 < 0.00674 0.307 0.337 0.168 0.17 0.3 0.0067 4.5 0.307 0.674 571
Osmocote Plus Outdoor and Indoor 15-9-12 < 0.472 < 0.236 0.627 < 0.00837 10.5 0.472 0.236 25.3 433 0.0084 261 10.5 0.472 338
Pennington Ultragreen All Purpose 3.52 0.61 2.8 < 0.05 18.3 3.52 0.61 2.6 2.8 < 0.05 2.9 18.3 < 0.5 621.4
Pennington Ultragreen Azalea Camellia and Rhododendron 4.76 0.51 3.2 < 0.05 22.2 4.76 0.51 3 3.2 < 0.05 3 22.2 < 0.5 615.4
Pennington Ultragreen Colorblooms and Bulbs 2.74 0.74 2 < 0.05 14 2.74 0.74 1.7 2.5 < 0.05 3.9 14.1 < 0.5 23.95