Review of Deficiency Symptoms and Causes:

Growers must be able to ID issues in their plants

Determine issues through a process of elimination of a photosynthesis checklist

1. Is there enough light?
2. Is there water stress?
3. Check CO2 levels
4. Temperatures?
5. Pest/Disease?
6. Nutrient deficiency

If you determine a likely nutrient issue, check for mobile nutrient deficiencies by looking at old growth and new growth.

Nitrogen issues:

• Chlorosis (yellowing) of leaves
• Yellowing of older leaves first

Magnesium issues:

• Interchlorosis (yellowing) between the veins
• To test Mg deficiency, use an Epsom Salt foliar (1tbs/1gallon water) - see results within 24h.
• Also, sodium can block Mg, which often requires flushing your soil.

Potassium issues:

• Chlorosis (yellowing) on leaf margins

Calcium issues:

• Yellowing in new leaf growth (not a mobile nutrient)
• Spotting on leaves is often calcium

Iron issues:

• Yellowing in new growth

Manganese, Boron, Copper:

• Tough to determine for these nutrients
• Warts on leaf surface? Often Boron

Mites (non-nutritional)

• Rolling of leaves and distorted new growth