I have a job aerating and overseeding. Wanted to do it this fall but the customer said he wanted it done now. Anyways I sent a soil sample in and the ph is a little high, 7.4. The soil lab says apply sulphur at 29# per 1000 sq.ft. and incorporate to a 6" depth. Well I've aerated this but I'm not able to incorporate anything. Should I put any sulphur on the surface before I slitseed this lawn or hold off on until a later date? The customer wants his lawn seeded as soon as possible.