garden lime

I limed what was going to be my brassica bed but I changed my rotation around and they got planted somewhere completely different. My brassicas are in but I noticed they just aren't coming on so I proded about with my PH thing and it came back as very acidic, so can I lime now?  and how would I go on feed any fert recomendation that wuldn't react too badly with the lime. foliar feed maybe if someone could recomend something that would be great.
thanks in advance
Pete