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2. Labeling of fertilizer - Wikipedia

   en.wikipedia.org/wiki/Labeling_of_fertilizer

   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.

3. Soil test - Wikipedia

   en.wikipedia.org/wiki/Soil_test

   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.

4. Fertilizer - Wikipedia

   en.wikipedia.org/wiki/Fertilizer

   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).

5. Plant stress measurement - Wikipedia

   en.wikipedia.org/wiki/Plant_stress_measurement

   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.

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7. Even before US alcohol warning, younger Americans were ...

   www.aol.com/news/even-us-alcohol-warning-younger...

   The U.S. Surgeon General's warning of an increased risk of cancer from drinking alcohol may end up resonating most with younger Americans - who in recent years were already turning to mocktails ...