The massive spike in 2021-22 borrowing target at Rs 23 lakh crore, has led to a 31 basis points rally in benchmark bond yields to well over 6 per cent since the announcement of Budget, and RBI needs to contain the same by reining in the short-sellers, says a report. The Reserve Bank’s assiduous support to the Centre’s debt management has ensured that in the first half of 2020-21 the borrowing cost for the Centre was the lowest in past 16 years as bond yields were below 5.75 per cent, the report by SBI Research said on Monday.