I don't think petite is a height so much as a body shape. I have seen tall women shopping in the petite section because they have a short waist or shorter arms or wanted a skirt that fits them better than the regular ones, and I have seen smaller women shopping in the junior/misses/womens section for similar reasons.
Sweet clover needs a high pH, 6.0 or higher, for proper nodulation to occur, and it has a higher calcium requirement as well. Sweet clover is able to obtain phosphorus from relatively unavailable soil phosphates and will grow on soils where alfalfa, red clover or ladino will fail.
These agencies not only test pH but also analyze your soil type to make a recommendation on how much lime to apply to raise your lawn's pH to a desired level. Bagged or Bulk If your acre of lawn tests out at a pH of 5, for example, it needs a one-point increase in pH to bring it up to a pH of 6 for turfgrass health. The 1.2 tons of limestone needed to accomplish this change is equal to 48 standard 50-pound bags of ground agricultural limestone.