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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. Cannabis cultivation - Wikipedia

    en.wikipedia.org/wiki/Cannabis_cultivation

    Cultivation of cannabis is the production of cannabis infructescences ("buds" or "leaves"). Cultivation techniques for other purposes (such as hemp production) differ.. In the United States, all cannabis products in a regulated market must be grown in the state where they are sold because federal law continues to ban interstate cannabis sales.

  4. Terra preta - Wikipedia

    en.wikipedia.org/wiki/Terra_preta

    Terra preta zones are generally surrounded by terra comum ([ˈtɛʁɐ koˈmũ, ku-]), or "common soil"; these are infertile soils, mainly acrisols, [6] but also ferralsols and arenosols. [7] Deforested arable soils in the Amazon are productive for a short period of time before their nutrients are consumed or leached away by rain or flooding.

  5. Cannabis sativa - Wikipedia

    en.wikipedia.org/wiki/Cannabis_sativa

    In soil, the optimum pH for the plant is 6.3 to 6.8. In hydroponic growing, the nutrient solution is best at 5.2 to 5.8, making Cannabis well-suited to hydroponics because this pH range is hostile to most bacteria and fungi. [citation needed]

  6. Podzol - Wikipedia

    en.wikipedia.org/wiki/Podzol

    In the middle, there is often a thin horizon of 0.5 to 1 centimetre (0.2 to 0.4 in). The bleached soil horizon, which always has a higher value than the horizons above and below it, goes over into a red or red-brown horizon (so-called Podzolic B). The colour is strongest in the upper part, and change at a depth of 50 to 100 centimetres (20 to ...

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