Oh forgot something. Something similarto what "KaiB" was saying. Make sure you check the ENV of the lime. Most Co-op extentions figure your amount of lime per acre based on 100% env. Most Agiculture Lime with the exemption of Pellitized lime is usually much less than 100%env, more like 50% - 70%env. Lower the env the more lime you need, so you said you need 2ton/acre which could mean you need 3 or 4 ton/acre. Just make sure you check becuase you could get ripped off in a hurry. That is why we get our lime from a few different sources.
Another thing is there are different types of lime. Check and see if you need high cal or high mag lime. Once you get your ph in line you shouldnt have to spread any lime for at least 3-4 years.
Lime is your cheapest fertilizer by far and if yor Ph is not in line your wasting your time and money on low yeilds.
Just trying to help as I have learned alot in the last few year in this business.