I can't imagine planting that many vines and installing that many posts without an auger on a tractor. I managed to disc, set trellis posts, apply minerals, till, and plant 25 vines in one day with a very small john deere with an auger(post hole digger on a 3-point hitch. The auger is 5 inches in dia. and makes shoveling the planting hole much easier. Compost and humus will naturally lower your ph. and make trace minerals more available to the plants.