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.
Soil pH Considerations. The Japanese maple prefers soil that is less than 7 on the pH scale. The pH scale runs from 0 to 14, with anything below 7 being considered acidic and anything over 7 considered alkaline. Each unit represents a 10-fold difference, so soil that has a pH of 8 is 10 times as alkaline as soil with a pH of 7.