Fertiliser drove optimism at the Pakistan Stock Exchange (PSX) on Thursday as shares surged more than 1,700 points, crossing the 97,000 barrier for the first time after a bearish spell the day before. The benchmark KSE-100 index climbed 1499.74 points, 1.57 per cent, to stand at 97,046.19 from the previous close of 95,546.45 points at 1:24pm. Finally, the index closed at 97,328.39 points, up by