Make sure you read the labels of your supplements to see how these nutrients interact with each other. Too much of some will lock out others. Calcium and nitrogen will decrease the absorption of potassium, for example. Just be sure not to use too much of something without a full understanding of what it does.
With potentially deadly consequences and a higher chance of appearing in the flowering stage, a potassium deficiency can be dangerous. Make sure you’re prepared to prevent and even solve it if a deficiency arises.
The appearance of spots on the leaves will be the symptom to follow. Firstly, you’ll see those necrotic spots characterised by their brown tonality. Left untreated, more spots will begin to show. This time with chlorotic ones, characterised by a white colour. The veins of the leaves will keep their green colour, unlike many deficiencies. What you’ll notice shifting colour are the petioles and stems, now showing red tones.
In case lights are not the problem, the deficiency might be caused by an excess of fertilizers and nutrients. Excess salt is especially common as it tends to build up in the growing medium.
You might also be overwatering your plant. Proper watering practices will go a long way in keeping a plant healthy. The method and frequency with which you water will impact your future buds massively. Don’t overlook this.
When plants suffer from a nutrient deficiency, they are weak and have little resistance to disease. This is why it’s important to know how to detect and fix the deficiency in time. Potassium is essential for terpene production. If not enough is supplied, your buds will lack flavour and smell. The flowering stage is where you’ll most likely face a deficiency like this.
Before implementing any changes to your grow medium or watering solution, take a look at your lights. With strong LED and HPS grow lights, you might be overheating the leaves. These will show burn symptoms even if the overall temperature is cool. Just make sure you check for this first. Move your plants further away from the lights for a couple of days to determine the root of the issue.
Nutrient lockout is a very common cause of most deficiencies. When the pH of the soil is too low, it makes the medium too acidic. This causes stress in the root zone and prevents the uptake of potassium. How can you stop this?
Deficiencies do happen in soil and other mediums every so often. The most common symptom you’ll notice is a brown or yellow colouring in the tips and edges of the leaves. With the passing of time, these will curl up, appearing burnt – much like an iron deficiency. Another thing that will raise suspicion is stretching. If one plant seems to be taller than the others around it, it’s not a good sign as this weakens the stems.
Nutrient deficiencies are a very common problem amongst growers. This one, however, might have dangerous consequences if not taken care of in a timely manner.
Potassium, is the “K” in your N/P/K Ratio. Like Nitrogen and Phosphorous, it is known as a “Macro nutrient”, and is one of the three main elements needed in plant growth. Here will will discuss Potassium Excess, this is when your plant has too much Potassium.
Too much potassium can cause the plant to have “lock out”. This will stop the plant from eating other vital elements, and other deficiencies will soon show. If not solved quickly, it can have a lasting effect on your harvest.
Potassium helps the pores of the plant open and close, which essentially, allows it to sweat and breathe. It is also responsible for the production of many enzymes the plant needs to grow. With out it, the plant would not be able to produce the starches needed for photosynthesis.
Because Potassium excess will cause lock out of other nutrients, it can be wrongly diagnosed. Look at out for the top leaves growing thin blades. Middle leaves will develop burn around their tips. Flowering will be slow to start, and flower growth will be diminished.
It will be harder to remove any element in soils than it would be in hydro or coco, as the drainage isn’t so good and you can risk over watering your plants. It is best to do one big flush, to remove as much as possible from the medium. After the flush, let the soil dry out until the pot is light before watering again.
If you think your plant is suffering from Potassium Excess, then feel free to ask for help in our cannabis growers forum
Once you have flushed, or removed your old reservoir, feed your plants again, at half of their usual EC. This will restore their colour, to a healthier shade of green, within a few days. But any damaged or burnt leaves will not fully recover.
Flushing your medium, with plain, PH’d water, is always a good way to reduce the amount of any nutrient in your medium.
If you don’t have an EC meter, and you’re growing in hydro or coco, you will need one! If you would like to know what your plant is eating, you need a good reliable EC meter.
Pottasium Excess can be confused for other plant problems. It is tricky to diagnose. Have a look at Percys Grow Guide, to help diagnose, correctly.