Your pictures are showing the beginning of a Calcium deficiency but I'm not even sure it's worth treating. You're also showing a bit too much N. I'm assuming you're in soil because of the cover crop I see. Anyway the more information you give the more helpful the response.
There is some Powdery mildew on the small plants bottom leaves on picture 3 which needs correcting and some rust spots which could indicate a lockout or a nutrient deficiency. And from how dark those leaves are I would say it's a lockout. Also, the plant in flower looks undeveloped for day 60 of flower. Probably due to lack of light?