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canvas prints tomato canvas prints fertiliser canvas prints chemical canvas prints npk canvas prints mixtures canvas prints nitrogen canvas prints phosphorus canvas prints potassium canvas prints sulphur canvas prints magnesium canvas prints piles canvas prints pile canvas prints miracle gro canvas prints grow canvas prints iron canvas prints

photographs tomato photos fertiliser photos chemical photos npk photos mixtures photos nitrogen photos phosphorus photos potassium photos sulphur photos magnesium photos piles photos pile photos miracle gro photos grow photos iron photos

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Chemical fertilizers. Samples of different chemical fertilizer mixtures. The main elements required by plant life are nitrogen (N), phosphorus (P) and potassium (K). Supplements based on compounds that contain these elements are referred to as NPK fertilizers. Different ratios, and additional trace elements, are used depending on the crop and soil. Clockwise from far left, the N:P:K ratios are: 15:5:20, with 2 parts magnesium (Mg) and 3 parts sulphur (S); 15: 30:15, with trace elements (commercial Miracle- Gro mixture); 12:10:27 with added sulphur, iron (Fe) and maganese (Mn); 1:1:1; and 16:8:13 with 2 parts Mg (tomato fertilizer).

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