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The second number ("P value") is the percentage by weight of phosphorus pentoxide P 2 O 5. The third number ("K value") is the equivalent content of potassium oxide K 2 O. [3] For example, a 15-13-20 fertilizer would contain 15% by weight of nitrogen, 13% by weight of P 2 O 5, 20% by weight of K 2 O, and 52% of some inert ingredient.
A 50-pound (23 kg) bag of fertilizer labeled 16-4-8 contains 8 lb (3.6 kg) of nitrogen (16% of the 50 pounds), an amount of phosphorus equivalent to that in 2 pounds of P 2 O 5 (4% of 50 pounds), and 4 pounds of K 2 O (8% of 50 pounds).
Similarly, in 2004, laboratories began providing fertilizer recommendations along with the soil composition report. Lab tests are more accurate and often utilize very precise flow injection technology (or Near InfraRed (NIR) scanning [6] [7]). In addition, lab tests frequently include professional interpretation of results and recommendations.
An Fv/Fm value in the range of 0.79 to 0.84 is the approximate optimal value for many plant species, with lowered values indicating plant stress (Maxwell K., Johnson G. N. 2000), (Kitajima and Butler, 1975). [11] Fv/Fm is a fast test that usually takes a few seconds. It was developed in and around 1975 by Kitajima and Butler.
Bone meal provides phosphorus and calcium to plants, along with a largely inconsequential amount of nitrogen. [4] The N-P-K rating of bone meal is typically 3–15–0 [5] along with a calcium content of around 12% (18% CaO equiv.), [6] although it can vary quite a bit depending on the source from 1–13–0 to 3–22–0.
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