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.
Clovers (Trifolium spp.) are a group of plants in the legume, or bean, family that have the ability to return nitrogen to the soil. There are numerous types of clover that can be grown in U.S. Department of Agriculture plant hardiness zones 3 through 11. The amount of nitrogen produced by clovers depends on the variety, as well as other factors.