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2. Potassium deficiency (plants) - Wikipedia

   en.wikipedia.org/wiki/Potassium_deficiency_(plants)

   Other inorganic potassium fertilizers include potassium nitrate, potassium sulfate, and monopotassium phosphate. Wood ash also has high potassium content but must be used cautiously due its effect on pH level. [7] Adequate moisture is necessary for effective potassium uptake; low soil water reduces K uptake by plant roots.

3. Plant nutrients in soil - Wikipedia

   en.wikipedia.org/wiki/Plant_nutrients_in_soil

   Nitrogen is the most critical element obtained by plants from the soil, to the exception of moist tropical forests where phosphorus is the limiting soil nutrient, [36] and nitrogen deficiency often limits plant growth. [37] Plants can use nitrogen as either the ammonium cation (NH 4 +) or the anion nitrate (NO 3 −).

4. Soil fertility - Wikipedia

   en.wikipedia.org/wiki/Soil_fertility

   Nitrogen and potassium are also needed in substantial amounts. For this reason these three elements are always identified on a commercial fertilizer analysis. For example, a 10-10-15 fertilizer has 10 percent nitrogen, 10 percent available phosphorus (P 2 O 5) and 15 percent water-soluble potassium (K 2 O). Sulfur is the fourth element that may ...

5. Plant nutrition - Wikipedia

   en.wikipedia.org/wiki/Plant_nutrition

   Plant nutrition is a difficult subject to understand completely, partially because of the variation between different plants and even between different species or individuals of a given clone. Elements present at low levels may cause deficiency symptoms, and toxicity is possible at levels that are too high.

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7. Trump warns BRICS nations against replacing US dollar

   www.aol.com/news/trump-warns-brics-nations...

   U.S. President-elect Donald Trump on Saturday demanded that BRICS member countries commit to not creating a new currency or supporting another currency that would replace the United States dollar ...