- Lowering the alkalinity of the substrate, providing Sulphur, manure and organic fertilizers together with fertilisers which acidify the substrate.
- Providing the plant with too much Iron chelates for a quick uptake.
- Foliar applications with Iron Sulphate to solve small deficiencies.
Current types of chelates:
These chelates stabilize the metal ions to improve its resistance to oxidation of iron, preventing them from precipitation. But it should also be noted that chelates can enter in competition with other ions of other elements such as Calcium and Magnesium, which cause Iron ions to displace.
Cannabis motherplant with Iron deficiency
Advance of Iron deficiency
Fe-EDTA: This chelate is suitable for substrates with a PH range lower than 6.0, although with a PH over 6.5 half of the Iron won’t be available for the plant.
On the contrary, on these following two pictures we can see how the Iron deficiency is already present from an early stage. This problem is caused by a mismanagement of the nutrients and for using an unsuitable substrate for cannabis plants. In this case, we should use nutrients rich in N-P-K and micro-nutrients so that the plant has a balanced nutrition.
In these cases, when we speak about a motherplant and if the affected area isn’t too expanded, we should prune the upper part of the plant to remove the new shoots, since Iron isn’t a mobile element. If it isn’t a motherplant and the plant is growing, we can adjust the PH level, fertiliser, temperature and other conditions and not flower the plant until it is completely recovered. If the plant grows too much due the extended growth period, we can use several pruning/training techniques to control its height.
Plants use different and varied ways to absorb the Iron contained in the substrate. Through chelating mechanisms – based on the creation of Siderophores that act sinergically with different bacteria – Iron becomes much more profitable for cannabis plants.
In this post we explain you about the deficiency and excess of iron in cannabis plants. The best way to control these problems is to know how to avoid
Solution For Cannabis Iron Deficiency
Immediately after adding chicken manure and watering, the plant started producing bright yellow, almost white leaves that immediately dried up and died from the damage. Even though this plant was showing the signs of an iron deficiency, the iron was available in the soil – the problem was that the plant just couldn’t get access to the nutrients due to nutrient lock-out conditions. In this case, grower needs to dig up the manure (since that is the real cause of this problem) & replant with good soil.
1.) Adjust pH to Correct Range
Iron deficiencies can show up with the plant is having root problems or if the plant is overwatered, even if the pH is right and the iron is there. Proper watering practices help plants grow healthy and avoid a host of problems!
2.) Give the Right Nutrients
In fact, most growers have actually already given plenty of iron to their cannabis plants since it is found abundantly in most tap water. If you’re using quality soil or cannabis-friendly nutrients, you probably don’t need to worry about adding more iron.
If you cannot get rid of a cannabis iron deficiency, please consult our 7-Step Cure to 99% of Cannabis Growing Problems
- In soil, iron is best absorbed by the roots in the 6.0 – 6.5 pH range (although it’s generally recommended for soil growers to keep pH in the 6.0-7.0 range, iron tends to get locked out when the pH is higher, especially above 7.0)
- In coco coir or hydro, iron is best absorbed by the roots in the 5.5 – 6.5 pH range
The main symptoms of a cannabis iron deficiency are:
Problem: A cannabis iron deficiency causes bright yellow leaves on new growth. This deficiency is usually caused by problems with pH.