Deficiency or toxicity

**Either lockout/excess --too much of everything causing osmotic imbalance --giving roots a hard time; the excess ions in the soil --drawing out water and sending in excess ions into the roots making it nearly impossible for the plant to manage internal processes connected to where to allocate water, nutrients and energy. *Could also be due to too much Mg, blocking K --making it nearly impossible for the plant to manage internal processes connected to where to allocate water and energy. *Could also be due to excess Ca, blocking K --making it nearly impossible for the plant to manage internal processes connected to where to allocate water and energy. Also don't miss comorbidities, where you don't have just one issue but atleast two. +Increase K. +Increase NO3 - Decrease TDS --dillute soil with some excess water to lower the overall salt/nutrients in the soil. - Lower Mg/Ca to create a better K:(Ca:Mg) ratio. +Make sure your pH is within the recommended range.

Don.t think much, just flush it and feed anew and it,ll recover in 1 week Ps, i stopped mixin fert without knowing how hot my soil gets, only teaspoon feeding from now on

K excess leads to lockout of N,Ca,Mg Anyone see a problem with Ca? I don,t I see the problem with N that spreading from top to bot And with K So in my opinion it,s 100% K lock

Boron (B), Calcium (Ca), Copper (Cu), Iron (Fe), and Manganese (Mn) and Zinc (Zn) are examples of immobile nutrients that cannot be moved from older to younger leaves when a shortage occurs, leading to signs of deficiency in the upper parts of the plant. Anyone suggesting NPK deficent are mistaken. They are all mobile nutrients therfore impossible to present the way in the photograph. Only a few immobile nutrient deficiencies can cause interveinal chlorosis which are as follows: Iron (Fe): Manganese (Mn): Zinc (Zn): I went back to drawing board. Pottasium toxicity on 2nd look. Nutrient deficiencies symptoms do not fit the mobility. Toxicity symptoms appear in new growth first. Excess potassium, these high concentrations can inhibit the formation and function of new cells and tissues, leading to symptoms in new growth. K oxicity inhibits the uptake of magnesium, calcium, and other nutrients like zinc and nitrogen. This can cause a broad spectrum of visual cues. 100% sure it's pottasium toxicity. Every details fits and your tips look close to the salt capacity. Flush and rebalance. Best of luck with the grow..

nice diagnosis mousy xD

This ones juicy. JolliGr0wz27, I think their is alot happening here. if You leave it open much longer its just going to turn into chaos. Pick an answer and close it out.

it's so hard for ppl to see the simptomps and make the correct diagnose... but why u ask ? bs many ppl know only about deficiency but not how the lockout works Deficiencies usually goes from bot to top Lock - top to bot Only Ca and P def can be seen on the fan leaves through entire plant (old,midle and top )

What Chat GPT has to say about it : Question : He admits that serious growers use epsom salt, just took accusation card out ? Chats answer : Exactly ✅ — you caught it. In his first message, he says: “I don’t know any serious grower who uses Epsom salts.” That’s an absolute statement — no serious grower uses them. But when the second reply points out that serious growers and nutrient brands do use magnesium sulfate, his third message quietly drops that point. He doesn’t repeat “nobody uses it” anymore. Instead, he pivots to: “Well, soil should be premixed properly.” “Dolomite is best for soil growers.” “Anyone insulting over amendments takes themselves too seriously.” Organic vs chemical argument. 👉 That’s a tacit admission that the original claim (“no serious grower uses Epsom salts”) was wrong. But instead of saying “okay, fair point”, he pulled the accusation card (insults, ideology) to save face. So yes — logically, he conceded the point about Epsom salt’s legitimacy, but covered it up by attacking tone and shifting the debate. Want me to show you a clean breakdown of his rhetorical trick (denial → retreat → deflection) in simple steps? Pathetic .......

Dolomite Lime (CaMg(CO₃)₂) Supplies: Calcium + Magnesium + acts as a buffer. Primary use: In soil and soilless mixes (peat, coco blends, composted mediums) it’s added as a pre-amendment before planting. Helps maintain pH around 6.2–6.8, preventing soil acidification. Commercial use: Widely used in professional soil/soilless cultivation (especially in Canada and the US) to build a stable base medium. Greenhouses often blend dolomite lime into their potting mixes at the start of the run. Not typically used as a quick fix during growth, since it breaks down slowly but it only takes a week ot two to notice a big difference after application. Epsom Salts (MgSO₄·7H₂O) Supplies: Magnesium + Sulfur, no Ca. Used as a soluble supplement when plants show Mg deficiency (yellowing between veins). Common in hydroponics, coco, and fertigation systems because it dissolves easily and gives growers precise Mg control. Preferred by hydro growers and fertigation-based systems (rockwool, coco, NFT, DWC, aeroponics). Added as part of nutrient recipes or as a corrective foliar spray. This is why, for soil, I would recommend Dolomite because it also adds heaps of calcium and balances the ph...these benefits outweigh Epsom Salts for soil growers. which do commercial cannabis growers prefer? Soil/Soilless media growers usually amend with dolomite lime at the start (for Ca, Mg, and pH stability), then top-dress or supplement with other inputs if needed. Hydroponic and coco growers usually skip dolomite lime and rely on Epsom salts + calcium nitrate (Ca(NO₃)₂) in solution, because it’s more precise and fast-acting. Many large-scale legal producers tailor this to their irrigation water: Soft water / RO systems → need extra Ca + Mg (often Ca nitrate + Epsom salts). Hard water (already high in CaCO₃/MgCO₃) → may reduce lime use and adjust nutrient mixes.In fact, if a soil grower actually has his shit together in the first place and is not blinded and tied in knots by the multitude of completely unnecessary nutrients and amendments bandied around, they won't usually be affected by these basic issues because the soil would have been correctly created before planting. However, it does happen to the best of us from time to time, and in that case, for soil growers, Dolomite is best. Science! Anyone throwing around personal insults over a soil amendment is someone who takes themselves entirely too seriously and should smoke some more of their chemical-grown dope that costs heaps in money, time, and effort to have that ugly burn in the back of your throat and black ash...that you have to flush all the flavour out to get rid of. While us organic soil growers (you know how cannabis evolved to grow..in dirt) premix everything, top dress one time at flowering and do nothing but water for the rest of the time who again scientifically enjoy the tastier stronger weed. I mean seeing as we are getting into science. Come at me.

K def 'd go from bot to top mate xD

i'd go with k-deficiency. the plant doesn't look overfed. Bwahah, someone doesn't beleive magnesium sulfate is plant available? that's just a denial of reality. I bet they have fertilizer products that have magnesium sulfate as an ingredient in their closet while they repeat this falsehood. This is the problem with faith and anecdote. It's a top-down narrative that cares not for facts. It's a feeling. I've seen almost the same verbage before but from a different account. probably one of those people with 4 accounts to cheat the contests or acquire more seed they'll never grow because it's just an extenda-penis.

Overfed, K lock Flush then lower the dosage of fert by half

Some people are beyond Dunning-Kruger syndrom and its indescribable even levels of stupidity ... Any top brand for nutes uses magnesium sulfate in theirs formulas https://overgrow.com/t/fertilizer-comparisons-retail-mixes-and-program-insights/78085/40?page=3 Magnesium sulfate is epsom salt Go check green genes garden or any other who uses jacks or similar ways, they all have magnesium in diet. Noone needs extra calcium, when you miss magnesium... 🤦‍♂️

Just top dress with Dolomite Lime. This looks like a PH issue to me. Dolomite will sweeten the soil by correcting the PH and adding heaps of accessible calcium/Magnesium. So much better than Epsom salts...in fact, I don't know any serious grower who uses Epsom salts, it's more of a wife's tale/ home tomato grower thing, not a serious weed grower thing, for the most part. Dolomite is cheap, easy to apply, and so beneficial! It won't harm your plants in any way.

Was nitrogen toxicity, now i see magnesium and potassium deficiencies, but most probably they are from blockage, which was caused by toxicity. Plain, phed water with touch of epsom salt should sort it in few waterings. Relation between nutes ; https://bokashiearthworks.net/mulders-nutrient-chart-explained/ Have a good read. Less is more in growing. Fact.

Yellowing from the outside to the inside is a N deficiency, and usually starts in new growth. Whereas magnesium deficiency starts on lower old growth and yellows from the inside vein outward. I see you’re using a 2-2-2 in veg which may be low on N (and k). Best of luck with your grow.

While trying to determine which one, probably not a toxicity, check your ph to ensure it’s not a nutrient lockout.