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2. Nitrogen, phosphorus and potassium are the key garden ... - AOL

   www.aol.com/nitrogen-phosphorus-potassium-tkey...

   As many know, healthy, nutrient-rich soil supports a productive vegetable garden. Nitrogen (N), phosphorus (P), and potassium (K) are the key macronutrients required by plants for their growth ...

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. How Does Terra Nitrogen Really Boost Its Returns? - AOL

   www.aol.com/news/2011-07-27-how-does-terra...

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5. Organic fertilizer - Wikipedia

   en.wikipedia.org/wiki/Organic_fertilizer

   Grain meals can be made of corn gluten, alfalfa, cottonseed, or soybean. Most supply nitrogen and potassium, but soybean meal provides nitrogen and phosphorus. [27] When initially spread they can cause an increase in ammonia within the soil and burn seeds, it is recommended to use these after plants have developed, to ensure crop success.

6. List of nitrogen-fixing-clade families - Wikipedia

   en.wikipedia.org/wiki/List_of_nitrogen-fixing...

   The nitrogen-fixing clade consists of four orders of flowering plants: Cucurbitales, Fabales, Fagales and Rosales. [a] This subgroup of the rosids encompasses 28 families of trees, shrubs, vines and herbaceous perennials and annuals. The roots of many of the species host bacteria that fix nitrogen into compounds the plants can use. [4] [5]

7. How Does Terra Nitrogen Boost Its Returns? - AOL

   www.aol.com/2012/01/14/how-does-terra-nitrogen...

   As investors, we need to understand how our companies truly make their money. A neat trick developed for just that purpose -- the DuPont Formula -- can help us do so. So in this series we let the ...