Today, Ethan Walter discusses nutrient deficiencies: what they are, how to identify them, and how to treat them.
A nutrient deficiency occurs when a plant is not getting enough of a nutrient for the normal plant functions. Common deficiencies are N, P, K, (three of the macronutrients), and Ca, Mg, and Fe.
In previous videos like this one (https://youtu.be/jaZ_x-sgLO4), you learned that nutrients are measured in water with a number called EC. EC is a very useful number, but it doesn’t tell you what *ratio* of one nutrient to another is. If you have the wrong ratio of one nutrient to another, you could be reading the EC as sufficient, when a certain nutrient is actually too low.
Deficiencies are identified by their symptoms. Some common deficiencies are chlorosis, necrosis, and stunted growth. The pattern that those symptoms occur in are important. Pay attention to where symptoms occur, whether it’s on new or old growth, and what combinations symptoms occur in.
Plant nutrients are categorized as either mobile or immobile in the plant. Mobile nutrient deficiencies occur first in older growth, and immobile nutrients occur in younger growth.
A plant deficiency key is a useful tool for farmers to identify deficiencies. If you’re still having trouble, consult with your local extension agents. Google is not a great way to ID deficiencies unless it’s from a peer reviewed source
Treat deficiencies by supplementing the nutrient that is lacking. You can supplement through your nutrient reservoir or foliar feeding (but be careful; high concentrations can burn the foliage and ruin a crop). Consider making regular supplements or switching suppliers if the deficiency occurs commonly.
Here are some common deficiencies and diagnosis tips:
Nitrogen is the “green up” nutrient. Nitrogen is mobile, so it will affect older growth first, and will cause total chlorosis starting at the tip of the leaf. You will also see stunted growth.
Phosphorus deficiency rarely displays outward symptoms noticeably or quickly. You may see stunted growth and the leaves will begin to get darker and purplish/bronze. Like nitrogen, these symptoms will begin on the old growth.
Potassium deficiencies is slow to show symptoms similar to phosphorus. Over time, you’ll see chlorosis around the edge of the leaf (the margin). Chlorosis will move from the tip to the back, but will leave the center of the leaf untouched. Like nitrogen, these symptoms will begin on the old growth.
Magnesium is a very common deficiency in hydroponics. It’s mobile, so it starts on old growth first. It looks similar to nitrogen deficiency, but will have inter veinal chlorosis instead of complete chlorosis. It also turns almost completely white (in comparison to the light green of a nitrogen deficiency). When you correct it, the old foliage will stay chlorotic, but new leaves will look healthy.
Calcium is an immobile nutrient, so it affects the the top of the plant (new growth) first. Calcium deficiencies show up as necrosis on the margin on the leaf. It will usually start at the tip of the leaf – which gets confused with tip burn – but be splotchy along the margin unlike tip burn.
*Calcium deficiency happens a lot in indoor systems with poor HVAC systems. The more airflow, the more respiration the plant does, allowing the immobile calcium to be sent to the leaf tip. Another cause is high humidity. Try to keep humidity between 40-60%.
Iron is an immobile nutrient, so it affects the the top of the plant (new growth) first. The example used here is basil, and it’s worth mentioning that basil deal with this a lot. The symptom is inter veinal chlorosis in new growth, similar to calcium.
*Iron deficiencies are especially common in symptoms that use UV filtration. The UV light creates a chemical reaction in the plant-ready iron (chelated iron) and makes it precipitate out of the solution. It sinks to the bottom, and the plants can’t use it. When we add iron, we unplug the UV filter for 24 hours. Iron can also be added through foliar applications.
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Timestamps/What’s Covered:
00:17 What are Nutrient Deficiencies?
00:49 Common Deficiencies
02:19 Identifying Deficiencies
04:23 Treating Deficiencies
07:00 Nitrogen
08:45 Phosphorus
10:09 Potassium
11:58 Magnesium
13:49 Iron
16:21 Calcium
21:48 Recap
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Music by: Scott Gratton
http://freemusicarchive.org/music/Scott_Gratton/
you take a lot of time to drop a little knowledge
I think I have iron deficiencies can I send u a pic to confirm if I was right or if it's a different kind
Very useful especially with the difference in magnesium vs nitrogen. I would of diagnosed some of my young ghost peppers as N deficient however your note that Mg tends to cause whiteness of the leaf is more consistent with what I am seeing.
Btip for this video, take a bit of time find plants with said deficiency and show it
Great vid but we need pictures !!!
what you say makes sense . i will use this to correct deficiencies via supplements thanks!
do you have a link to the nutrient deficiency key ? not sure what im looking at when i go to montana states webpage thnaks!
686 yeeeah
Shit, is this video still going?? Fell asleep for few minutes. Picking up green spray paint tmrw and a book to read for the next video 😉
This was a very thorough video on deficiencies and very good explanations of them, which is more than most do in their videos. But one thing I have yet to see anywhere is a 'completely' thorough and very specific "show-and-tell". Just like if it were a study done at a University or a science project. Where if you have a few examples of a control crop with no deficiencies, a very healthy plant. Then you have a couple of the same type of crops of each deficiency, that were purposely insufficient or withdrawn from the feeding schedule. (e.g. one crop purposely given insufficient amounts of Nitrogen, another insufficient amounts of Mag, etc.) This way you would have a few examples that were very specific and apparent. Also, where some of the examples would have multiple deficiencies that are common together do to lock-out, such as a pH lock-out or other. I feel that video would easily get millions of views and become the "go-to" for everyone who has questions in the subject. Just sayin 🙂
wonderful and simple explanation of deficiency in plants….thanks for the awesome video
well done…
Where to get these specific nutrients? Are human suppliments can be use as a substitute for it?
Dude, what a lousy video, lots of chatting loads of words very few images.
If you describe a disease or a leaf defect then PUT IN AN IMAGE of it. Just rattling on and on and describing 10 leaf defects in five seconds just doesnt cut it.
And dude, get rid of that dead animal on your head. It doesnt help you making better videos.
Fake,plastic garden,that's why there's deficiencies.
There you have it folks…from the horses mouth,"nutes" kill plants,anyone who engages in hydroponics is dumping bucket loads every week into the environment with little if any care for the harm you're causing .
bueno
Am I the only one that thought this was for Human nutrient deficiency and not plants? lol
The question is how to diagnose specific nutrient toxicity or overload?