Nikkei drops as investors take profits on quarterly gains; tankan eyed

* For the month, Nikkei gained 2.2 pct * For the quarter, index rose 10 pct * Coming BOJ tankan survey, U.S. job data eyed By Ayai Tomisawa TOKYO, March 31 (Reuters) - Japan's Nikkei share average dropped on Tuesday, shedding early gains as investors took profits on the last trading day of the quarter. The Nikkei benchmark fell 1.1 percent to 19,206.99 in choppy trade after rising to touch 19,607.25 in the morning. For the month, the Nikkei gained 2.2 percent and posted