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Grow QuestionsReferring to last photo (week 12), she is having w...

Referring to last photo (week 12), she is having w...

Bombadilstarted grow question 6 years ago

Referring to last photo (week 12), she is having weird behaviour: some leaves showing N deficiency (probably normal in this stage) but others are showing some kind of toxicity (?). Also can look like K deficiency, but it would be strange cause I'm pumping it in. What could it be?

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Week 12

Techniques. Defoliation

HighTVanswered grow question 6 years ago

Hey there @bombadil. Plants have 2 types of nutrients called mobile and immobile nutrients. Immobile nutrients CANT be moved around the plant and due to this the symptoms show directly on the newer growth where the deficiency is active. The other type of nutrient is Mobile. Mobile nutrients can be pulled from the lower leaves to be given to the newer growth up top as a survival method so they show symptoms on the bottom side of the plant first. You have a mobile nutrient deficiency evidenced by the lower growth being effected first by the absence. I see magnesium deficiency immediately. You will want to lower that PH 6.8 is to high you will want a PH of around 6.2-6.3 to give better access to all the nutrients including your deficient one Magnesium. Just be sure to give her that magnesium and she should stop showing signs of regression! Please update us on this Bombadil! 😎

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Selected By The Grower

Stickanswered grow question 6 years ago

Hi @Bombadil! A basic pH range and a heat stress led to this situation. Because of the wrong pH, roots cannot absorb Magnesium and your plants are having a Mag deficiency. What you're naming "toxicity" actually looks like a heat stress, I see curling-upward leaves which is a typical symptom of heat/light burn. Always buffer your pH, with or without nutrients your water should always remain in the optimal pH range for soil: 6.1~6.3. Consider increasing your lamp-to-plant distance to fix the heat issue and try to improve your airflow, buds should get a continuous cool breeeze to prevent heat stress. Hope this will help, keep us up-to-date and happy growing 👊

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OutForRealanswered grow question 6 years ago

Hello ! Your PH is high but if you started like that then the plant get used to it. In soil prefer 6.5 to avoid PH issues even if cannabis can thrive between 6 an 7 in soil. Now you should Google: cannabis soil PH chart and you will understand by your own. Your deficiencies are not that hard to fix. Don't forget that you are growing long flowering strain so she may need more N in early flowering than an Afghani for example. I hope it will help you ✌️🏼😁

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CRiSPrGrowanswered grow question 6 years ago

your intuition is right, i see two things happening : first your ph is too high which makes the plant not be able to absorb some of the micronutrients like Mg for example. Second you're "pumping it" and plants actually dont respond well to that: they start "locking out the nutrients" think of nutes more like a target with a bulls eye not a progress bar you have to fill. very easy to fix both thesej problems and hopefully your plants will recover . just get that PH down between 6 and 6.5 the soil should buffer it nicely with few fluctuations. Dial back the nutes to half strength next two feeds and maybe even keep it there, should sort out those wierd toxicity / lockout issues. Hope this helps my friend !

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