Molybdenum Deficiency
Problem: The initial symptoms may appear similar to a nitrogen deficiency (yellowing of older, lower leaves). Leaves may become mottled or spotted. However, the tell-tale sign of a molybdenum deficiency is the
Phosphorus Deficiency
Issue: A marijuana phosphorus deficiency normally appears on leaves from the lower/older parts of the plant. The lower leaves might turn dark green or yellow, and begin getting areas or huge splotches
Sulfur Deficiency
Problem: A sulfur deficiency is relatively rare and will manifest itself as all-over chlorosis (yellowing of leaves), usually starting with the newer leaves and at first may look like a nitrogen deficiency.
Copper Deficiency
Problem: A cannabis copper deficiency appears with leaf symptoms such as dark leaves that take on blue or even purple undertones. The tips and edges of leaves turn pale yellow or white