Liquid lime works the fastest but I believe is the most expensive. Ground (pulverized) lime is the second fastest and also the cheapest. I can get it in bags for $60 a ton or spread by a truck in bulk for around $30 dollars per ton and I' ve heard in some areas it' s even cheaper. The ground lime will work in about a month when turned into the soil along with good soil moisture (rain). Pelletized lime is the slowest taking up to 6 months to raise pH levels. It is also the most expensive but if you' re spreading it yourself it is the easiest to work with. All lime needs moisture to work properly so rainfall is normally the determining factor on how quick it kicks in. My suggestion is to go with the bulk ground lime if this is a new plot and can be accessed by a large truck. You' ll come out much cheaper and you can stand back and watch the truck do all the work. Then all you have to do is disc it in, wait a few weeks and start planting.