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.
Adaptation. White clover will grow in soils considered too acid for red clover and alfalfa, but it is more productive if the salt pH is 5.5 or higher. White clover needs adequate phosphorus and potassium for establishment, persistence and growth. White or ladino clover is especially responsive to cool, moist conditions.