is this phosphorus deficiency?

Started about a week ago.We had a few nites go down to 0 celcius.The plant is in a 20 gallon tub of promix with osmocoate Nutes.Im thinking phosphorus or manganese deficiency.Could it be sum kind of fungus?Its more on the bottom of plant.

Cold temps will cause purpling in some plants.

Dont understand what is causing the dead spots on leaves.Would cold temps cause that also?

That's most likely a nutrient deficiency.

phosphorus?Plant still needs 2 weeks before ready to chop.

dont worry about anymore help!Thanks Troutman for your help but games over!

monty49 said:

Started about a week ago.We had a few nites go down to 0 celcius.The plant is in a 20 gallon tub of promix with osmocoate Nutes.Im thinking phosphorus or manganese deficiency.Could it be sum kind of fungus?Its more on the bottom of plant.

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- Flush

Osmocote time released fertilizer

- The plants are either crispy from overfertilization or there is mildew going on.

There are a lot of plants growing around it, impeding airflow. Also, there are weeds growing, which may be giving off poisons in their competition for space with the cannabis plant.

- Dropping temperatures

These naturally lock out nutrients by stopping nutrient absorption during the night time. The plants are thrown back on the nutrients that are stored in the leaves.

- Osmocote?

Osmocote is a fertilizer for ornamental flowers.

a) You should really use cannabis specific nutrients and media if you're starting out and...

b) Make a supersoil and make your own liquid fertilizer from plant parts through fermentation with sugar. (Take an old clean alcohol bottle, fill with sugar for 10% and 20% cannabis tops/leaves or flowers, fill with tapwater, airtight, and put in a dark place for at least 2 weeks.) This creates complete fertilizers of solid (slow) and liquid (fast) nutrients, so your plants are fed all the time.

Think of this as microbe-released rather than time-released.

Also, the taste of organic is much better than synthetics. And you don't have to worry about additives or chemicals. Even if you grow commercially, most people prefer smoking clean burning weed, which organics pretty much guarantees if you use ingredients that have no strong taste.

Jumped in with both feet did ya? He cut it down!

Fungi disease can be caused by bacteria, fungus, and nematodes. Leaf spots can be caused by cold water that is sprayed on plants while the plant is under the hot sun or HID lights, or temperature stress can cause them to show quicker than if these are not exposed to the plant.

When I water I keep the water off the leaves to keep rust spots to a minimum. Water in the morning and only water the ground and not the leaves.