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.
Urea must be tilled in shortly after applying or before a heavy rain or you will lose most of it thru denitrication. Brassicas also prefer a PH in the 6.5/6.8 range so be sure to soil test and apply lime as needed. One can apply more dry fertilizer later on if the plants appear yellow or unhealthy.