Chemical elements which are involved in the construction of living tissue and which are needed by both plant and animal. The most important in terms of bulk are carbon, hydrogen and oxygen, with other essential ones including nitrogen, potassium, calcium, sulphur and phosphorus.

#<OpenStruct links=nil, context=nil, hash=-1234095651845633290, object=nil, value="http://opendata.inra.fr/anaeeThes/i_def_c2_126", mutex=nil>