Question: query about deficiency of calcium and boron.
Answer: boron (b): when b is deficient, older leaves turn yellow and brittle, and the growing points become necrotic and die. margins and leaf tips of mature leaves become necrotic. fruit may also be affected and develop scattered corky areas and exposed ovaries.
calcium (ca): interveinal chlorosis and leaf margin necrosis occur at the growing points in ca deficient plants. later, growing points die. leaves can be distorted. fruit may develop blossom-end rot. excess ca can cause white spots below the surface of pepper fruit. open-pollinated peppers may develop stip.