Nifty on course for weakest expiry since March amid surging bond yields

New Delhi, Sept. 29 -- The Nifty 50 stock index is slated for its weakest monthly expiry in six months on Tuesday amid surging bond yields induced by persistently high crude oil prices.The bellwether index closed at 22,780.25 on Monday and dropped to a low of 22,569.65 in trading on Tuesday, the ex…