What’s causing this ?

nitrogen toxicity blocks Boron and Calcium

Burning from nitrogen toxicity.

look like calcium deficiency, this or your leaves looks rather dark green so may be high on N, so possibly also a nutrient lockout.

Look like Cal Mag Deficiencies. Here's a guide on how to identify and correct these deficiencies: Identifying Deficiencies Calcium Deficiency: New leaves may appear distorted or irregularly shaped. Affected leaves might develop small brown spots, often near the edges. Root growth may be stunted. Magnesium Deficiency: Older leaves turn yellow starting at the tips and margins, but the veins may remain green. Leaves may curl upward and become brittle. Plant growth may slow down. Correcting Deficiencies Check pH Levels: Ensure the soil or nutrient solution pH is within the optimal range (6.0-7.0 for soil, 5.5-6.5 for hydroponics). Incorrect pH levels can prevent nutrient uptake, even if nutrients are present. Use Cal-Mag Supplements: Cal-Mag products are widely available and specifically designed to provide the right balance of calcium and magnesium. Follow the manufacturer's instructions for proper dosage. Adjust Fertilization Routine: Use a balanced fertilizer that includes micronutrients like calcium and magnesium. In hydroponic systems, ensure your nutrient solution includes these minerals. Improve Soil Quality (if applicable): For soil growers, adding dolomite lime can help increase calcium and magnesium levels. Ensure good soil aeration and drainage. Regular Monitoring: Monitor your plants closely after making changes. It may take a week or more to see improvement. Water Quality: Use filtered or reverse osmosis water if your tap water is extremely soft or hard. Preventive Measures Regular pH Testing: Regularly test the pH of your soil or nutrient solution. Balanced Nutrition: Use a well-rounded fertilizer regime that includes all necessary micro and macronutrients. Regular Plant Inspection: Regularly inspect your plants for early signs of nutrient deficiencies or other health issues. Caution Avoid Overcorrection: Adding too much calcium or magnesium can lead to other nutrient imbalances. Be Patient: It takes time for plants to recover from nutrient deficiencies.

Look like Cal Mag Deficiencies. Here's a guide on how to identify and correct these deficiencies: Identifying Deficiencies Calcium Deficiency: New leaves may appear distorted or irregularly shaped. Affected leaves might develop small brown spots, often near the edges. Root growth may be stunted. Magnesium Deficiency: Older leaves turn yellow starting at the tips and margins, but the veins may remain green. Leaves may curl upward and become brittle. Plant growth may slow down. Correcting Deficiencies Check pH Levels: Ensure the soil or nutrient solution pH is within the optimal range (6.0-7.0 for soil, 5.5-6.5 for hydroponics). Incorrect pH levels can prevent nutrient uptake, even if nutrients are present. Use Cal-Mag Supplements: Cal-Mag products are widely available and specifically designed to provide the right balance of calcium and magnesium. Follow the manufacturer's instructions for proper dosage. Adjust Fertilization Routine: Use a balanced fertilizer that includes micronutrients like calcium and magnesium. In hydroponic systems, ensure your nutrient solution includes these minerals. Improve Soil Quality (if applicable): For soil growers, adding dolomite lime can help increase calcium and magnesium levels. Ensure good soil aeration and drainage. Regular Monitoring: Monitor your plants closely after making changes. It may take a week or more to see improvement. Water Quality: Use filtered or reverse osmosis water if your tap water is extremely soft or hard. Preventive Measures Regular pH Testing: Regularly test the pH of your soil or nutrient solution. Balanced Nutrition: Use a well-rounded fertilizer regime that includes all necessary micro and macronutrients. Regular Plant Inspection: Regularly inspect your plants for early signs of nutrient deficiencies or other health issues. Caution Avoid Overcorrection: Adding too much calcium or magnesium can lead to other nutrient imbalances. Be Patient: It takes time for plants to recover from nutrient deficiencies.

Lol 132 diaries , grand master and more trophies than your average grower albeit a few years ago yet you need help with a calmag issue. Mmm🤔🤔

looks like calcium deficiency (i posted a few days about similar but more advanced) i introduced calmag to the nutrient mix and it's already neutered it out of my grow

awesome grow profile buddy this appears to me to be cal mag seems shes going through alot if your using led lights plants can often go through more cal mag than usual. 132 grows is very impressive.