The most common cause of manganese deficiency is incorrect pH levels in your soil. The best pH level for your plant to absorb manganese from the soil efficiently is around 6.0-6.5 pH. However, you must observe the plant carefully and adjust the pH levels dependent on its recovery.
However, the key difference between diagnosing manganese deficiency compared to magnesium deficiency is the age of the affected leaves. Magnesium is a mobile element, meaning it first appears on older leaves and spreads to newer ones. However, manganese is much more static, meaning that the new leaves are the first to be affected and it will rarely transfer to older, already established leaves.
This is also true with cannabis plants who need manganese as part of their growing process.
But how can you tell if your grow showing signs of manganese deficiency and how can you combat its symptoms? This simple guide should explain everything that you need to know.
Manganese is an often overlooked element found in soil. Due to its symbiotic relationship with iron, plants that are deficient in manganese are often misdiagnosed and the issues fail to deteriorate.
Usually, if sorted correctly, manganese deficiency symptoms should stop spreading within a week. However, if you are still observing its spread to other leaves, there may be very little manganese in your soil and some foliar feeding may be in order. This is a process by which liquid fertilizer is sprayed onto the leaves of your plant for absorption as opposed to the soil.
It is important to note that any leaves that have been damaged significantly by manganese deficiency are extremely unlikely to improve, so focus on newer, unaffected leaves to determine whether or not any deficiencies are still occurring.
Much like magnesium deficiency, plants that are manganese deficient can be spotted by observing the colour of the leaves on the plant. If the leaves are turning yellow while the veins remain green then you may have an issue. If the deficiency has not been observed quickly enough, you may also see dead spots on some of your leaves.
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Manganese is an often overlooked element found in soil. Due to its symbiotic relationship with iron, plants that are deficient in manganese are often misdiagnosed and the issues fail to deteriorate. This is also true with cannabis plants who need manganese as part of their growing process. But h …
It usually costs a grower a couple weeks of trial and error before corrective action is applied to treat the manganese deficiency. By this time, growth has all but stopped completely. Much of the upper growth will be a discoloured, wilting patchwork of light fading green, yellow and brown.
Even if the grower accurately diagnoses manganese deficiency early, increasing micronutrient supplementation without getting the pH into the 5.5-6.0 range is futile. It may worsen the situation and lead to an iron build-up that will lockout manganese.
The best way to avoid manganese deficiency is to ensure every watering is pH-adjusted to the optimal level for your specific growing medium. Take note that 6.0pH is the upper threshold for manganese. Check to confirm. Invest in a pH pen.
On the other hand, if you have lost time troubleshooting and increased micronutrient doses in the process, we can help. Again, start by flushing plants as above. Stick to the program and apply a light nutrient follow-up feed. Odds are, iron could well be locking-out manganese at this point. Plus the damage (brown crispy leaves in particular) will not recover. If your marijuana is still in vegetative growth, top the plants – why not?
Do you have unhealthy cannabis plants that seem to only go from bad to worse? Your marijuana could be suffering from a manganese deficiency. Learn how to handle this lesser known, but vital micronutrient.
However, if manganese deficiency has hit the crop during bloom, you still must prune away the affected growth. Leaving necrotic growth is a huge risk. Don’t invite diseases and pathogens. Look at it as an opportunity to experiment with defoliation. Remember to prune in stages as stripping plants suddenly bare is highly stressful.
Yellow leaves that rapidly degenerate and turn brown is the nasty calling card of manganese deficiency. Immobile and confined to new, fresh growth, this particular malady is relatively uncommon. However, when cannabis plants have manganese deficiency, it is almost always misdiagnosed as something else. Anything but manganese deficiency.
Should you catch the manganese deficiency in its early onset, a flush with pure 6.0pH water is a great start. Followed up by a carefully adjusted 6.0pH light nutrient solution, your plants should get back on track. Watering and feeding will need to be closely monitored to prevent recurrence.
High pH in any medium and/or excessive iron is the number one root cause of manganese deficiency. Of course, we mean that literally. Moreover, pH above 6.0 across all substrates will render manganese unavailable to the roots. This is bad news. Manganese is essential to chlorophyll production and photosynthesis.
Probably not on top of most growers' list of potential threats to pot plants, manganese deficiency is rare, but the ill effects can sabotage a marijuana grow.