Yellow leaf

blacksmanstarted grow question 2h ago

My plant, which is 6 weeks old, has started turning yellow on its lower leaves. Could this be due to a nitrogen deficiency? I stopped giving biogrow 4 days ago .You can check out my diary link below for more photos. growdiaries.com/diaries/290736-grow-journal-by-blacksman

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Selkotanswered grow question 2h ago

It looks like a nitrogen and potassium deficiency; I think you should double the dose of Biobloom and do a light defoliation on your plants

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Selected By The Grower

Selkotanswered grow question 1h ago

PS: Check your pH carefully (between 6.1 and 6.4) and the water temperature (20–25°C); it’s crucial at this stage

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Nocone_Purpleanswered grow question 1h ago

Lower-leaf yellowing at week 6 is very likely early nitrogen deficiency, especially since you stopped giving Bio-Grow 4 days ago. In soil, autos still need a small amount of nitrogen in mid-flower to keep the plant healthy. Your newer growth looks fine, so this isn’t toxicity or light stress. I’d reintroduce a light dose of Bio-Grow (1/4-1/2 strength) and the yellowing should slow down. Check your pH as well, because poor uptake can mimic deficiency.

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