Nutrient Deficiency in Hemp

There is no secret of growing a quality and productive hemp, it’s simply by providing the right
amount of moisture, proper and adequate light and sufficient nutrients and you will have
acquired a healthy hemp plant proficient of withstanding and fighting off most pest and diseases.
Hemp growth and development mainly rely on the incorporation and concentration of mineral
nutrient accessible in the soil.

When hemp do not receive sufficient level of nutrient they become susceptible to pathogenic,
their growth stunt leading to decrease yields, their leaves start yellowing and quality also
decreases. Knowing the signs of nutrients deficiency is an important skill for hemp growers.
There are two classes of nutrients considered very essential: macronutrients and micronutrients.
Macronutrients are the building block containing proteins and nucleic acids and are required in
large quantities; they include phosphorus, nitrogen, potassium and magnesium. Micronutrients
include, iron, copper, zinc and manganese they required in small quantity and act as cofactors for
enzyme activity.
Mineral nutrients are obtained from soil via hemp roots but many factors can influence the
effectiveness of how nutrients can be acquired in the plant. One of the factors being the
composition of certain soils like Ph. When the condition is too alkaline or acidic, it inhibits the
availability of certain nutrients. Soil water content also affects nutrient uptake. When soil is
waterlogged, it affect the accessibility and movement of some nutrients. Over fertilizing our
plants can also lead to locking up some nutrient from being translocated .
Nutrients can further be classified as mobile and immobile depending on whether they can be
translocated once absorbed by the plants. A mobile nutrient can move to solve a deficiency in

another part of a plant while immobile remain close to where they were first deposited. As hemp
growers, knowing nutrients are mobile and which are immobile will help diagnose potential
deficiencies.

Important Hemp Nutrients and Symptoms of Deficiency
1. Phosphorus
Essential for photosynthesis and releases stored energy in form of carbohydrates.
Deficiency Symptoms;
 Purpling of leaf stems.
 Develop leave dead spots.
 Stunted growth.
 Delayed flowering.
2. Nitrogen
Is important throughout the hemp life cycle but most important during vegetative growth.
Deficiency Symptoms;

 Yellowing of leaves.
 Leave curling and dropping.
 Early flowering with minimum bud sites.
3. Potassium
Essential in production and translocation of carbohydrates.
Deficiency Symptoms;

 Increased internal temperature in the foliage of the plants.
 Dull, overly green leaves.
 Dehydration and curling of youth hemp.
 Leaf burn and weak plants.
4. Sulfur

Important for plant respiration and breaking down fatty acids.
Deficiency Symptoms;

 Young leaves turns lime green then yellow.
 Low, weak flower production.
5. Calcium
Important for integrating cells and growth
Deficiency Symptoms;

 Browning-yellowing spots.
 Withering and eventually dying of root tips
6. Copper
Helps in nitrogen fixation and oxygen reduction
Deficiency Symptoms;

 Wilting and twisting of hemp stems.
 Dead spot on leaf tips.
7. Magnesium
Essential in absorbing energy from light and helps enzymes to produce carbohydrates that
creates flowering.
Deficiency Symptoms:

 Interveinal chlorosis.
 Rust colored spots.
 Curling, dying and dropping of leaves.
8. Manganese
Helps in oxygen reduction and chlorophyll production.
Deficiency Symptoms;
 Necrotic spots.
 Yellowing of interveinal.

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