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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. Land equivalent ratio - Wikipedia

   en.wikipedia.org/wiki/Land_equivalent_ratio

   Land equivalent ratio. The FAO defines land equivalent ratio (LER) as: [2]. the ratio of the area under sole cropping to the area under intercropping needed to give equal amounts of yield at the same management level.

4. Illinois Soil Nitrogen Test - Wikipedia

   en.wikipedia.org/wiki/Illinois_Soil_Nitrogen_Test

   Some form of nitrogen fertilizer is needed if levels are below this range. On the other hand, if levels are above this range, addition of nitrogen fertilizer will not increase crop yield. In the corn belt, since about 1975, the predominant method of estimating the amount of nitrogen needed for corn has been the "yield-based" method. A farmer ...

5. Should You Fertilize Houseplants in Winter? Here's When to ...

   www.aol.com/lifestyle/fertilize-houseplants...

   Apply fertilizer as needed. Diluted fertilizer can be applied to actively growing plants about once a month. However, there is no “one size fits all” rule when it comes to winter fertilizing ...

6. Gardeners: Here's Everything You Need to Know about Using ...

   www.aol.com/gardeners-heres-everything-know...

   Before fertilizing your garden here's what to know about organic fertilizers, whether you need them, and how to find the right ones for you.

7. Plant nutrients in soil - Wikipedia

   en.wikipedia.org/wiki/Plant_nutrients_in_soil

   Nutrients in the soil are taken up by the plant through its roots, and in particular its root hairs.To be taken up by a plant, a nutrient element must be located near the root surface; however, the supply of nutrients in contact with the root is rapidly depleted within a distance of ca. 2 mm. [14] There are three basic mechanisms whereby nutrient ions dissolved in the soil solution are brought ...