Nitrogen is required for all stages of growth but need more during the vegetative stage of growth. It is used in plant cells for the building blocks enzymes, protein and the green chlorophyll pigment. Chlorophyll is critical for plant growth, converting sunlight into energy in the form of carbohydrates and sugars.
Phosphorus is important in energy transfer and storage in the plant. Without Phosphorus your plant will not be able to use the Nitrogen provided.
Phosphorus Deficiency Signs
- Slow or stunted growth
- Smaller leaves with blotchy spots
- Reddish or purple leaf stems
- Older leaves turn dark colours and curl downwards
Potassium is required for water uptake, flowering and cell wall development. Potassium keeps the sap stream and water flowing freely throughout the plant. It also helps plant resist environmental stresses, diseases and insects.
Potassium Deficiency Signs
- Older leaves turning dull, yellowing and eventually developing rust coloured spots
- Weak and brittle stems
- Leaf edges look burnt, curled up leaves
Sulfur aids in the production of essential amino acids, proteins and vitamins for chlorophyll production. It also plays a role in plant resistance of environmental stresses, diseases and pests.
Sulfur Deficiency Signs
- Yellowing of all leaves
- Buds dying off
- Stiff and brittle leaves before falling off
Calcium builds strong cell walls and healthy root systems. Using too much Potassium can cause a deficiency in calcium, particularly if your soil has a low pH.
Calcium Deficiency Signs
- Mottling or spotting of the leaf surface
- Crinkling of leaves, curled tips
- Stunted growth and smaller or deformed new leaves
Magnesium is needed to move phosphorus around the plant and is important component in chlorophyll.
Magnesium Deficiency Signs
- Yellowish or light green colouring of the veins and edges of older leaves
- Brittle leaves
These are required in trace amounts. Should be considered when selecting nutrients for growing weed.
- Molybdenum (Mo): Involved in nitrogen metabolism
- Copper (Cu): Needed to produce chlorophyll and for plant respiration
- Zinc (Zn): Associated with chlorophyll production and protein synthesis
- Manganese (Mn): Involved in growth, germination and new tissue production
- Iron (Fe): Helps carry oxygen around plant cells and involved in chlorophyll production
- Boron (B): Moves sugars around the plant and is involved in the uptake of calcium
The important thing to remember with all these nutrients is that they work together.
Often over or under feeding of a particular nutrient will cause the plant to block other nutrients from being uptake. A well balanced nutrient developed for growing cannabis will ensure you get the most out of your indoor marijuana garden.
The best nutrients for cannabis is a personal choice amongst growers. You will find every grower has a personal favourite. I hope I've been able to help you with your choice.