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Soil is required, except for cannabis grown with hydroponics ... A soil pH between 5.8 and 6.5. ... is similar to topping in that it causes lower branches to grow ...
Environmental impact of cannabis cultivation includes all the environmental issues which occur as a result of cannabis cultivation. Cannabis agriculture is a massive industry in its scope and extent, yet its environmental impact is much less researched than comparable agricultural products produced at this scale. [ 1 ]
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]
Soil acidification is the buildup of hydrogen cations, which reduces the soil pH. Chemically, this happens when a proton donor gets added to the soil. The donor can be an acid, such as nitric acid, sulfuric acid, or carbonic acid. It can also be a compound such as aluminium sulfate, which reacts in the soil to release protons.
The optimal substrate consists of a deep, rich and well-drained soil in a sunny place with a pH between 5.5 and 7.5. [17] The rhizomes should be planted at 10 cm deep, after the last frost. [ 18 ] Although it can tolerate dry periods, occasional irrigation will be beneficial for the yield.
The prevailing view in the 1940s and 1950s was that P availability was maximized near neutrality (soil pH 6.5–7.5), and decreased at higher and lower pH. [ 29 ] [ 30 ] Interactions of phosphorus with pH in the moderately to slightly acidic range (pH 5.5–6.5) are, however, far more complex than is suggested by this view.
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Unlike soil, hydroponic nutrient solutions do not have cation-exchange capacity (CEC) from clay particles or organic matter. The absence of CEC and soil pores means the pH, oxygen saturation, and nutrient concentrations can change much more rapidly in hydroponic setups than is possible in soil.