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2. John Innes compost - Wikipedia

   en.wikipedia.org/wiki/John_Innes_compost

   The potting mixes are used to grow different types of plants depending on their nutrient requirements. [1] All three potting mixes have the same soil component: 7 parts sterilised loam; 3 parts peat; 2 parts sharp sand [5] They each contain ground limestone, and varying quantities of the same base fertiliser mix: 2 parts hoof and horn; 2 parts ...

3. Potting soil - Wikipedia

   en.wikipedia.org/wiki/Potting_soil

   A flowerpot filled with potting soil. Potting soil or growing media, also known as potting mix or potting compost (UK), is a substrate used to grow plants in containers. The first recorded use of the term is from an 1861 issue of the American Agriculturist. [1] Despite its name, little or no soil is usually used in potting soil.

4. Hydroponics - Wikipedia

   en.wikipedia.org/wiki/Hydroponics

   It is also used in potting soil mixes to decrease soil density. It does contain a high amount of fluorine which could be harmful to some plants. [ 66 ] Perlite has similar properties and uses to vermiculite but, in general, holds more air and less water and is buoyant.

5. Topsoil - Wikipedia

   en.wikipedia.org/wiki/Topsoil

   Potting soil, compost, manure and peat are also sold for domestic uses with each having specific intended purposes. Topsoil products typically are not as suitable for potting plants or growing fruit and veg as potting soil or compost. Using it for this purpose can also work out prohibitively expensive compared to other alternatives.

6. Carbon-to-nitrogen ratio - Wikipedia

   en.wikipedia.org/wiki/Carbon-to-nitrogen_ratio

   The C:N ratio of soil can be modified by the addition of materials such as compost, manure, and mulch. A feedstock with a near-optimal C:N ratio will be consumed quickly. Any excess C will cause the N originally in the soil to be consumed, competing with the plant for nutrients (immobilization) – at least temporarily until the microbes die.

7. Nitrogen deficiency - Wikipedia

   en.wikipedia.org/wiki/Nitrogen_deficiency

   Soil organisms use any nitrogen available to break down carbon sources, making nitrogen unavailable to plants. [1] This is known as "robbing" the soil of nitrogen. All vegetables apart from nitrogen fixing legumes are prone to this disorder. Nitrogen deficiency can be prevented by using grass mowings as a mulch or foliar feeding with manure.