Certain wavelengths the plant requires to generate calcium are absent. So keep an eye on calcium deficiency when growing with LED. When do signs of calcium deficiency begin. Calcium is a semi-mobile nutrient, so the signs of a calcium deficiency begin with the new growths on your plant, but they will start moving after a period of time. You
Calcium nutrient deficiency affects rapidly expanding tissue such as new leaves, roots and developing fruit. Meristems fail to expand and growing points become necrotic. Leaf scorch, tip burn and blossom end rot are classic symptoms of low Calcium status, all of which are worse during conditions that promote rapid growth.d2awQMQ.