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.
The logarithmic measure of the acid-alkaline balance in water or soil is called pH. The most acidic solution is pH 1. A level of pH of 7 is neutral and a pH of 14 is the most alkaline solution. For several reasons the pH has a profound effect on the cannabis plants. Various plants live under different pH levels, they have adapted to this. In hydroponic solutions marijuana grows with a low pH of 5.5. Marijuana grows best in water or soil with a pH level between 6.0-6.5 (slightly acidic). Good garden soils consist of this pH level. In this range the plants nutrients are water soluble.