New Research Results: Optimal pH for Cannabis

March 5, 2021 0 Comments

A stable pH is one of the secrets to the vigorous growth of cannabis, and its sudden change may cause great problems for plants. Stress due to pH changes, temporary stop of growth are the least of the possible difficulties. The ability of hemp to absorb necessary elements depends on the acidity of the substrate or nutrient solution. Both low and high pH leads to a lack of certain minerals. Fertilizing the soil will not solve the problem. Macro and microelements will accumulate in soil or water, but the roots will not be able to absorb them. What are the optimal pH values for cannabis? Read our new research results below.

Deficits due to the pH Changes 

Based on the table of absorption of elements at different pH levels, minerals are available to plants at a normal level of 5.5 to 6.5. However, for maximum yield, it is worth sticking to the recommended levels for the growing season, flowering, or fruiting period of your plants. If the pH is too high, micronutrient absorption is blocked:

  • At 6.5 units, there is a problem of manganese deficiency; 
  • At 7 units, iron precipitates and becomes inaccessible to plants. 

Therefore, a nutrient solution with a pH> 6.5 is harmful to hydroponic plants. However, it is also incorrect to strictly fix the acidity at the point of 6.45 – 6.5. It will be more correct to have a smooth and natural change in the pH level within normal limits, for example, keep it from 5.8 to 6.5.

If the pH is too low, it also causes problems with the absorption of minerals:

  • Phosphorus, potassium, magnesium, and molybdenum deficiencies can be caused by too frequent flushing;
  • Magnesium deficiency is noticeable, especially in cold substrates;
  • Reducing the absorption of manganese, phosphate, iron, copper, zinc, and boron will lead to deficits, especially in humid, cold environments.

Suitable pH for Cannabis Cultivation

Marijuana grows best in slightly acidic soils. The optimal indicators are from 6.0 to 7.0. It is best to keep it in the range of 6.2-6.5. It is not necessary to achieve static acidity. Small jumps within acceptable limits are more beneficial for hemp. Each element has its own acidity values for better absorption by the root system.

Indoors, marijuana is most commonly grown in hydroponic installations or inert substrates. The normal acidity is 5.5-6.5. Here, fluctuations within the permissible values are very important for the assimilation of all macro and microelements.

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