When you have a look at the tire of the car, you will notice that the numbers are written in the following pattern: P215/50R17. What is the Meaning of the First Letter? The first alphabet on the tire can be P, LT, ST or T. Sometimes there is the absence of the first alphabet. The first alphabet denotes:
Clay is one of the three principal types of soil, the other two being sand and loam. A certain amount of clay is a desirable constituent of soil, since it binds other kinds of particles together and makes the whole retentive of water. Excessively clayey soils, however, are exceedingly difficult to cultivate.
For example, a sandy loam is a soil that has a mix of particle sizesbut that is dominant in sand. Likewise, clay loam has a mix of particlesizes, but has more clay than a loam textured soil. Figure A3â2 showsthe importance of texture in a sandy soil. â See Chapter D2 for moreinformation on testing soiltexture.