PLS 671: Environmental Soil Chemistry

Instructions for Lab Report

At this point in the lab, you have many diverse sets of data and you are asked to combine them.  These data sets include:

a.)  Percent sand, silt, and clay to estimate soil textural class

b.)  CEC for size fractions and whole soil

c.)  Soil organic matter (total C and N, E4/E6 on humic acid)

d.)  pH, lime requirement, soil solution chemistry

e.)  Oxalate-Fe and Mn

f.)  Zn sorption isotherms on whole soil and soil fractions

g.)  Sorption kinetics for phosphorus
  h.)  Nitrification studies

 You are expected to consider soil characteristics (a-e) in the interpretation of reactivity data (f-h).  For example, if your soil pH was ~3.0 and Zn sorption was low, then I would expect you to provide an explanation for this finding.  On the other hand, if Zn sorption was high at a soil pH of 3.0, then other factors may be important.  In writing the report, you can approach the Introduction by introducing the soil and its physical and chemical properties followed by objectives of the lab exercises.  Alternatively, the processes studied in the reactivity experiments (f-h) could be introduced and developed using the literature and then defining the objectives.  Because of the variety of processes involved in f-h, I am more concerned with your interpretations of the data (in light of the literature included) in the results and discussion section.  Where appropriate, inclusion of MINEQL+ data could strengthen your paper.  Tables and Figures can be included in the body of the text or at the end of the References.

Written Reports: Due December 9, 2004


Abstract (250 word max)


Materials and Methods

Results and Discussion


References (I will check these)

Oral reports:  December 9, 2004