For soils outside the USA, give both the local identification and the U.S. equivalent. Reported data should include no more significant digits than the precision of the experimental methods warrants. For example, if the estimated standard error is 1.43, the means should be rounded to the nearest 0.1. Use spaces instead of commas for the decimal separator. Other units may be reported as well if this helps understanding, serves the primary intended audience, or is needed for replication of the work.
Abbreviations save space, but excessive use impedes understanding.
Use standard symbols for chemical elements. Provide a list of such abbreviations, with their definitions. Define variables at first use. Use subscripts for modifiers, reserving superscripts for powers. For variable naming, consistent mathematical style is preferred to ad hoc or language-specific computer style.