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.
Ball clover does best on level, fine sandy loam and clay loam soils that maintain good soil moisture. Seedling vigor is poor because of the small seed size. It should be mixed with annual ryegrass to reduce bloat problems. BERSEEM CLOVER is best adapted to loam and clay loam with a soil pH of 7 or higher.